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<rss version="2.0"> <channel> <title>Materials Science Forum</title> <link>https://www.scientific.net/MSF</link> <description>Latest Results for Materials Science Forum</description> <language>en-us</language> <image> <title>Materials Science Forum</title> <link>https://www.scientific.net</link> <url>https://www.scientific.net/Image/JournalCover/4</url> </image> <item> <title>Preface</title> <link>https://www.scientific.net/MSF.1147.-1</link> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>The Effect of Rare-Earth Dopants on Dielectric Behavior and Energy Storage Performances of NBST-Based Relaxor Ferroelectric Ceramics</title> <link>https://www.scientific.net/MSF.1147.3</link> <guid>10.4028/p-1gRkF5</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Xiang Jun Meng, Ying Yuan In this study, Na0.3Bi0.38Sr0.28TiO3–2 wt% Re2O3 (abbreviated as NBST–Re; Re = La, Nd, Sm, Dy, Er, and Yb) ceramics were prepared by the conventional solid-state reaction method. The effect of different rare-earth dopants on the phase structure, microstructure, dielectric behavior, and energy storage performance (ESP) of NBST-Re ceramics was investigated. All the prepared ceramics exhibit dense microstructure and perovskite structure with the coexistence of rhombohedral (R3c) and tetragonal (P4bm) phases. The temperature-dependent dielectric constant and dielectric loss curves prove obvious relaxation behavior induced by rare-earth dopants. Notably, the best ESPs were realized in NBST–Yb ceramic with a recoverable energy density of 2.10 J/cm3 and the corresponding efficiency of 70.45% at 200 kV/cm. Furthermore, excellent frequency and temperature stabilities support the prospect of NBST-Yb ceramic in energy storage. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Microwave Sintering Modification of 85M7Z3CLT Microwave Dielectric Ceramics</title> <link>https://www.scientific.net/MSF.1147.13</link> <guid>10.4028/p-oM3LbF</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Li Zhao, Guang Yu Li, Jia Feng Liu, Xun Fei Cai, Qi Hu, Yu Ye Hu, Ya Long Jiang The 0.85(Mg0.7Zn0.3)TiO3-0.15(Ca0.61La0.26)TiO3(referred to as 85M7Z3CLT) ceramics were fabricated by microwave sintering(MWS) and conventional sintering(CS) techniques. The effects of MWS and CS on the sintering property, crystal phase structure and dielectric properties of 85M7Z3CLT were discussed. Compared with CS, MWS had a short sintering period and a high volume density. The results indicated that the phase composition of 85M7Z3CLT ceramics were not changed after MWS, with (Mg0.7Zn0.3)TiO3 and (Ca0.61La0.26)TiO3 structure as the main crystal phase were also obtained by MWS. However, the grain growth was significantly inhibited due to the rapid sintering speed of MWS, which resulted in a fine, uniform microstructure. Furthermore, microwave-sintered ceramics had excellent dielectric properties due to the miscellaneous phase (Mg0.7Zn0.3)Ti2O5 being suppressed. As a result, excellent dielectric properties of 27.11 for εr, 103,500GHz for Q·f and +2ppm/°C for τf were obtained by microwave sintering at 1275°C for 20 min. Therefore, the ceramic quality factor was increased by 22% compared with the conventional sintering.Key words: microwave technique; (Mg,Zn)TiO3; dielectric ceramics </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Development of Silver Nanoparticles Enriched N-Dodecanoic Acid as Energy Storage Material for Thermal Management of Electronic Systems</title> <link>https://www.scientific.net/MSF.1147.23</link> <guid>10.4028/p-gK4w5H</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Lingampally Swetha, Rajagopalan Parameshwaran, Deshmukh Sandip Phase change materials (PCMs) with metal nanoparticles have gained significant attention due to the limitation of pure PCMs possessing low thermal conductivity in various applications like electronics, electrical, and thermal devices. In order to overcome these limitations, metal nanoparticles, mainly which possess enhanced thermal conductivity, have sparked considerable interest in dispersing the nanoparticles into PCM. This study focuses primarily on developing nanoparticles-based advanced energy storage material for the thermal management and cooling of electronic systems. To achieve this, thermally conductive silver (Ag) nanoparticles enriched n-dodecanoic acid (SeDA) PCM were prepared with a certain mass fraction of Ag nanoparticles embedded into the PCM using the sol-gel synthesis. The morphology and crystalline structure of the as-synthesized silver nanoparticles were analyzed by FESEM and XRD, respectively, resulting in the highly crystalline particle size ranging from 20 nm to 100 nm. The impact of enriching silver (Ag) nanoparticles into n-dodecanoic acid revealed a noticeable increase in thermal conductivity and swift nucleation kinetics when compared to the pure PCM. Besides, the SeDA PCM exhibited a high heat storage capacity of 194.5 J/g, which is relatively good in terms of regulating the temperature and heat retrieval rate of the electronic systems. Furthermore, the FTIR and the TGA results have confirmed the chemical stability and thermal stability of the Ag-enriched PCM on a long-term basis. These attributes of SeDA PCM are considered to be favorable for the thermal management of electronic systems. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Development and Characterization of Ni-Cobalt Oxide Coatings for Functional Applications</title> <link>https://www.scientific.net/MSF.1147.33</link> <guid>10.4028/p-no0tA2</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): A.R. Shashikala, Bangarpet Shankar Sridhar Nanoparticles of Cobalt oxide (Co3O4) was prepared by green chemistry method using plant resources. Leaf and stem extract of Trionella-Foenum Graecum (Fenugreek) was used for the synthesis of Co3O4 nanoparticles. The obtained nanoCo3O4 particles were used in elelctroplating bath solution to get Ni-CoO nanocoatings on aluminium alloy substrates. Characterization of nanoparticles and the composite coatings were carried out through EDAX, SEM, XRD and FTIR studies. EDAX confirms the presence of cobalt and oxygen in the nanoparticles as well as in the coatings. SEM studies showed the spherical morphology of the nanoparticles and the coatings exhibited rod like structure. XRD studies confirms the nanosize of particles and maximum peak was obtained at (311) confirming the presence of nanocobalt oxide. The developed coatings showed higher solar absorptance and low infrared emittance, indicating better solar selectivity of the coatings. The coatings also exhibited good corrosion resistance. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Study on the Influence of Curing Regime on the Microstructural and Mechanical Properties of Alkali-Activated Concrete with Coarse Recycled Aggregates</title> <link>https://www.scientific.net/MSF.1147.41</link> <guid>10.4028/p-t6VE6b</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): M.D. Ikramullah Khan, V. Vinayaka Ram, Rajagopalan Parameshwaran This study investigates the influence of curing regimes on the microstructure and mechanical properties of alkali-activated concrete (AAC) containing coarse recycled aggregates (CRA) for structural applications. Building on prior research at BITS, Pilani Hyderabad Campus, AAC specimens were prepared by replacing natural aggregates (NA) with processed and unprocessed CRAs. Class F fly ash and ground granulated blast furnace slag (GGBFS) served as precursors, activated by sodium hydroxide and sodium silicate solutions. A consistent mix design employed a 4% sodium concentration and 60:40 fly ash-to-slag ratio. The target compressive strength was 40 MPa for structural use. Curing conditions are known to affect various AAC properties, including early and long-term strength, hydration kinetics, durability, and dimensional stability. While prior research explored these aspects under different curing regimes, the influence on microstructure development in AACs with high CRA content remains under-reported, especially considering curing regime variations. This research addresses this gap by employing three distinct curing regimes: ambient temperature (30°C) for 28 days, ambient temperature with plastic wrap for 28 days, and oven curing at 75°C for 72 hours followed by 25 days at 30°C. Microstructural investigations using XRD, FESEM, and stereo microscopy were complemented by ultrasonic pulse velocity and compressive strength tests. Notably, specimens subjected to oven curing at 75°C exhibited superior performance compared to those cured at ambient temperature with or without plastic wrapping </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Effect of Stress during Press-Fitting on Tribological Behavior of Self-Lubricating Composite Liners in Spherical Plain Bearings</title> <link>https://www.scientific.net/MSF.1147.55</link> <guid>10.4028/p-R34YDh</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Hai Tang Chen, Lin Lin Zhu, Xiong Rong Huang, Jing Jing Zhang, Cheng Liang Hu Self-lubricating spherical plain bearings are widely used in industry due to their high load capacity, excellent self-lubrication performance and superior impact resistance. The composite made of PTFE/Nomex fabrics and phenolic resin is selected as self-lubricating liners because of the great tribological properties. In this study, the effect of stress during press-fitting process on the tribological behavior of the composite liners in bearings was investigated. Five levels of stresses within a range of 0MPa~680MPa were firstly applied by upsetting process, and then ball-on-disk friction tests were conducted to evaluate the tribological properties. The variation of measured friction coefficient over testing time under different stresses was measured, and the microscopic surface morphology before and after friction tests was observed. Results show that the stress generated during the press-fitting process increases the friction coefficient, while decreases the fluctuation of friction coefficient. In addition, the fluctuation amplitude of the friction coefficients introduced by stress reaches 5.6%. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Effect of Micro-Dimples on Lubrication in Ironing of Stainless Steel</title> <link>https://www.scientific.net/MSF.1147.63</link> <guid>10.4028/p-Z5ludI</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Kazuhiko Kitamura, Takehiko Makino, Masanori Nawa Most forming oils have changed to chloride-free oil containing no chloride additives to protect environments regarding as the big issue of sustainable manufacturing. Several high-performance oil without chloride and die coating has been developed recently. In this study, the effect of micro-dimples on a die formed by a cutting machine or a laser device was tried to use chloride-free oil for ironing of stainless steel. The heavy galling occurred during ironing of stainless steel when the normal die without micro-dimples is used under a condition lubricated with chloride-free oil. The micro-dimples formed by the cutting machine only promoted galling because a large amount of burr remained around the dimples. The micro-dimples formed by the ultrashort pulse laser prevent from galling. The dimples have a smooth and mild profile on the die. The coverage area ratio of micro-dimples larger than 20% is needed for better ironing. A zigzag arrangement of the dimples uses the oil efficiently for well lubrication because galling occurs at the no dimples line between two rows of dimples if the dimples are neatly arranged parallel to the ironing direction. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Graphene Nano-Lubricant for the Improved Rolling Contact Fatigue (RCF) Life of AISI 4140 Steel under Rolling with Slip Conditions</title> <link>https://www.scientific.net/MSF.1147.71</link> <guid>10.4028/p-6Qq4yt</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): M.R. Ranju, D. Kesavan Rolling and sliding contacts are common tribological interactions between surfaces in high-speed rotating components such as bearings, gears, and rail wheels. If the bearing is operated under mixed/boundary lubrication conditions, the major failure mechanism would be micro-pitting and wear, and its extent depends on the percentage slide between the contact pairs. This work compares the rolling contact fatigue (RCF) behavior of AISI 4140 steel under pure rolling (zero slip) and slip conditions by using base lubricant and formulated lubricant with graphene nanoadditives. Rolling contact fatigue performance under pure rolling and slip conditions shows a significant improvement with graphene lubrication compared to base lubrication. Under pure rolling conditions, the RCF L10 life improved 3-fold with graphene lubricant compared to base lubricant. Similarly, under the slip condition, a significant improvement in the anti-wear performance was observed for the graphene lubrication compared with the base lubrication. A detailed wear track analysis was performed using scanning electron microscopy and Raman spectroscopy. The results reveal that the formation of tribo-films on the surface is the major reason for the improved anti-wear performance with graphene nanolubrication. According to the working conditions, the physical tribo-film was observed under pure rolling conditions, and the chemical tribo-film was observed under slip conditions. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Use of Liquid Lubricant with Glass Microspheres in Suspension to Permanently Improve the Tribological Behavior of PPS</title> <link>https://www.scientific.net/MSF.1147.79</link> <guid>10.4028/p-3ZoNPz</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Sergio Garcia Carrasco, Samuel Sanchez-Caballero, Miguel Angel Selles, Sergi Montava-Jorda, Alejandro de la Calle Salas In the numerous applications of technical polymers, it is a wide practice to compound them with solid lubricants in early steps of fabrication to improve the tribological behavior, considerably reducing friction and wear. Nonetheless, especially in injection molding, the inclusion of these lubricants often poses difficulties as they can significantly alter the viscosity and thermal behavior of the resin inside the screw. This practice is also quite inefficient due to the treatment of the whole bulk of the parts, where only the contact surfaces are affected by these inclusions. So, the aim of this work is to use lubricants with these solid particles in suspension, in order to have them permanently embedded in the working surfaces as they are put into service and then studying the impact that these inclusions have in the tribological behavior of the base polymer. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Development of Oil Free Lubricants for Cold Rolling of Low-Carbon Steel</title> <link>https://www.scientific.net/MSF.1147.87</link> <guid>10.4028/p-51hG0T</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Leon Jacobs, Delphine Reche, Andreas Ban, Valentina Colla, Orlando Toscanelli, Martin Raulf, Martin Schlupp, Bas Smeulders, Mike Cook, Wim Filemon Oil-in-water emulsions (O/W-emulsions) are generally used to lubricate the cold rolling process of low-carbon steel. Besides the obvious advantages of efficient lubrication and cooling of the process, there are also some disadvantages mainly related to emulsion bath maintenance, subsequent production steps and waste disposal. In some application areas, Oil Free Lubricants (OFL’s) have shown to be at least equally effective in decreasing friction and wear as conventional lubricants, while resulting in benefits related to waste disposal. In 2018 a project (acronym ‘RollOilFree’) was started with funding from the Research Fund for Coal and Steel (RFCS). The objective of this project was to develop an OFL as a lubricant for the cold rolling process of low-carbon steel and hot rolling of aluminium. A cold rolling lubricant can be evaluated based on many criteria; for some criteria the OFL even outperformed the oil-based emulsion, but it was found that for some rolling conditions the coefficient of friction with the OFL was still too high. In September 2023 a follow-up project, “Transfer of aqueous oil free lubricants into steel cold rolling practice” (acronym ‘RollOilFreeII’) has begun, also in the RFCS-framework. This article briefly recapitulates the findings in the RollOilFree-project and describes the objectives and benefits of the RollOilFreeII-project. Furthermore, the main activities in the project will be discussed. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Effects of Various Cooling and Lubrication Methods on the Tool Life and Hole Quality of Deep Drilled Small Holes in AISI 304L</title> <link>https://www.scientific.net/MSF.1147.97</link> <guid>10.4028/p-3nEbj8</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): John M. Scholey, Krystian K. Wika, Andrew Wright, Tarsem S. Sihra This research explores the feasibility of utilising supercritical carbon dioxide (scCO₂) as a coolant coupled with minimum quantity lubrication (MQL) as a lubricant, to replace conventional coolant and lubricating fluids (CLF’s) in small diameter deep hole drilling (DHD) of austenitic stainless steel (AISI 304L). The study investigates the impact of scCO₂+MQL on hole quality, surface roughness, and tool wear parameters in comparison to high-pressure soluble oil cutting fluid (HPC). The motivation stems from the need to supply sustainable and environmentally conscious CLF alternatives within the machining industry, specifically addressing the reduction of dependence on traditional HPC’s.ScCO₂+MQL offers significant advantages under specific conditions, particularly with mid-range feed rates and higher cutting speeds. On average, drilling under scCO₂+MQL conditions achieved a success rate 71% as effective as when drilling with HPC, however the difference can be attributed to the set of cutting conditions optimised primarily for HPC, not for scCO2. The results indicate the viability of scCO₂+MQL and its ability to produce results comparable to HPC. It also emphasises the complexities of transitioning from traditional CLFs to sustainable alternatives like scCO₂+MQL in DHD processes. The outcomes present an encouraging case for the environmental and cost benefits associated with scCO₂+MQL. However, it also highlights the need for further investigation and optimisation, particularly in tool design, to enhance performance and address the existing challenges. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Enhancing Machinability of Nimonic 90 Alloy by Micro-Texturing Based Solid Lubricant on AlTiN Coated Carbides: A Sustainable Approach towards Commercialization</title> <link>https://www.scientific.net/MSF.1147.107</link> <guid>10.4028/p-s4pfKO</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Gaurav Kumar, Sudarsan Ghosh, Paruchuri Venkateswara Rao The manufacturing industry has a significant impact on the economy of a country. Therefore, carrying out necessary developments and modifications in manufacturing machine components is essential. Some materials, called superalloys, are challenging to machine, and they have a wide application in the turbine components of aerospace, submarines, oil, nuclear, steam, and other power generation industries. Due to the exceptional properties of these superalloys their machining becomes very difficult and time-consuming; They damage the cutting tool, and excessive use of lubricants eventually affect the material handling and cost. These problems lower down the sustainability and therefore an attempt has been made in the current research work to eliminate the use of cutting fluid by impinging solid lubricant on AlTiN coated tungsten carbide cutting tool by using pulsed direct current magnetron sputtering and cathodic arc physical vapour deposition techniques. The micro-texturing is first done on rake face of the milling insert such that graphite, which acts as a solid lubricant, can be then deposited in those micro-textures. The end milling of Nimonic 90, a superalloy, is done using the solid lubricant filled microtextured insert under compressed air environment, and the cutting forces, cutting temperature, tool wear, and surface roughness are analysed. It is found that there is a substantial decrease in the cutting forces and tool wear when compared with non-textured tool due to less friction and temperature at the machining zone. Sustainability of such solid lubricant based textured cutting tool has shown improvement when compared with non-textured cutting tool. The machinability of Nimonic 90 is increased by implementing the solid lubricant-based cutting tool, and therefore, it can be effectively utilised for the machining of superalloys soon. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Temperature Sensing in Cold Forging with Thermochromically Enhanced Lubrication Systems</title> <link>https://www.scientific.net/MSF.1147.117</link> <guid>10.4028/p-x2pVQn</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Christoph Kuhn, Peter Groche Cold forming is characterized by high dimensional and shape accuracy as well as energy and cost efficiency in the series production of highly stressed components. Cold forming is characterized by high tribological loads. Complex lubrication systems are necessary to ensure fault-free production despite the high tribological loads. In the course of increasing demands on environmental compatibility, the disadvantageous zinc-phosphate-based lubricant systems have been replaced by more environmentally friendly single-layer lubricant systems. However, their functionality is strongly dependent on temperature, so that exact knowledge of the prevailing temperatures in the forming zone is necessary for optimum design of the lubricants [1]. Due to the high tribological stress, established measuring methods based on thermocouples can only approach the forming zone up to 10 mm. Previous works of the authors have shown that sensory lubricants based on thermochromic indicators are in principle capable of measuring temperatures directly in the forming zone [2,3]. Their functionality is based on the irreversible color change as a function of temperature [4]. The aim of this study is to develop a standardized test methodology for calibrating the sensory lubricants, which enables an exact correlation between temperature and color value. In addition, suitable indicators are to be identified and their influence on the tribological system analyzed. The test methodology developed uses inductive heating to heat the samples coated with the sensory lubricant to as high as 500 °C within 1 s. The temperature of the surface is determined by the temperature of the lubricant. By determining the surface temperatures reached as well as the color values under diffuse illumination in an integrating sphere, defined temperature ranges can be assigned to the color values of the indicators. With three indicators, which were identified as suitable, it was possible to detect temperatures in the contact zone of a full forward extrusion process and in the contact zone of the sliding compression test that reflect the simulated temperatures. In addition, the sliding compression test showed that the indicators have no influence on the tribological system up to an indicator concentration of 4 %. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>About the Possibility to Assess Cutting Fluids Efficiency Using an Instrumented Tribological Approach</title> <link>https://www.scientific.net/MSF.1147.125</link> <guid>10.4028/p-vhZ1nO</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Vincent Burnichon, Cédric Courbon, Ferdinando Salvatore, Miguel Angel Cruz Gracia, Ugo Masciantonio, Joël Rech During a machining operation, the tool tip is subjected to elevated interface temperatures and contact pressures. A considerable improvement can be achieved through an appropriate selection and application of a cutting fluid. Although many technologies attempt to reduce their use to move to a cleaner production, they are still widely employed in industry. Under such severe conditions, it is necessary to understand their exact contribution from a tribological point of view in order to optimize their use. The aim of this study is to evaluate the ability of a fluid to penetrate and remain at the tool-material interface. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> <item> <title>Enhancement of Mixed-Lubrication Models for Cold Rolling</title> <link>https://www.scientific.net/MSF.1147.133</link> <guid>10.4028/p-MgVz5p</guid> <description>Publication date: 26 March 2025 Source: Materials Science Forum Vol. 1147 Author(s): Leon Jacobs, Vincent Pater, Matthijn de Rooij Improved understanding of friction during cold rolling is crucial to further optimize the rolling process, to accurate analyse cold rolling defects and to increase model accuracy enabling an improved mill setup during industrial operation. Classical slab rolling models make use of the Coulomb friction law, assuming a constant coefficient of friction in the roll bite. In the last decades, mixed-lubrication models have been developed that explicitly take the lubricant action into account. These models have greatly increased the understanding of factors that influence friction during cold rolling, but quantitatively the model results should still be further improved before such models can be used as an online tool for setting up the cold rolling mill. This article describes a mixed-lubrication model to simulate cold rolling of low-carbon steel. Especially the tribological core of the model is extended and improved compared to state-of-the-art models. Friction mechanisms now also include a viscous shear stress and ploughing friction. The quantification of viscous shear stress was reported in a previous work [1], this work focuses on the quantification of ploughing friction. Material Point Method (MPM) simulations were carried out to determine the work piece strain-hardening and strainrate-hardening under a ploughing indenter. These simulations result in an ‘Surface Ploughing Resistance’ and finally in a quantification of the contribution of ploughing friction to the overall friction in the roll bite. The description of the various friction mechanisms (ploughing, adhesive and viscous shear) is implemented in the mixed-lubrication model. This article concludes by presenting typical results of the developed model. One of the main conclusions is that the contribution of ploughing friction in a cold rolling process cannot a priori be neglected. </description> <pubDate>Wed, 26 Mar 2025 00:00:00 +0100</pubDate> <feedDate>Thu, 10 Apr 2025 05:44:39 +0200</feedDate> </item> </channel> </rss>