Effect of microstructure and strain rate on hydrogen-induced delayed fracture of high-Mn TWIP/TRIP steels

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} </script> <script src="//translate.google.com/translate_a/element.js?cb=googleTranslateElementInit"></script> </ul> </div> </nav> <div class="container-fluid bg-grey"> <div class="container pt-3 pb-4"> <div class="white-container mt-4"> <h2 class="bg-hdr">Effect of microstructure and strain rate on hydrogen-induced delayed fracture of high-Mn TWIP/TRIP steels </h2> <p><span lang="EN-US">High Mn-TWIP/TRIP steels have been attracted much attention in the automotive field due to its excellent mechanical properties. However, the poor hydrogen embrittlement (HE) performance does limit its development. In this work, three kinds of high Mn-TWIP/TRIP steels with the almost same ultimate tensile strength (~1000MPa) were first prepared by different heat treatment processes. XRD test results show that the phase volume fraction of </span><span lang="EN-US">ε</span><span lang="EN-US">-martensite (PVFMs) is 0, 10% and 45%, respectively. Then the hydrogen-induced delayed cracking (HIDF) was studied by the slow strain rate test (SSRT) with hydrogen-charging. </span><span lang="EN-US">The results show that when the specimen contains a small amount of PVFMs (10%), hydrogen-promoted dislocation planar slip and dislocation transports the hydrogen atoms to the grain boundaries to reduce the bonding force of the grain boundaries at the slower strain rate (1×10<sup>-6</sup> s<sup>-1</sup>), thereby promoting the initiation of hydrogen-induced intergranular cracks; The interaction between deformation twins and grain boundaries promotes hydrogen-induced intergranular crack initiation at the faster strain rate (1×10<sup>-5</sup> s<sup>-1</sup>). When a large amount of PVFMs is contained (45%), the stress concentration caused by the inconsistency of </span><span lang="EN-US">ε</span><span lang="EN-US">-martensite during plastic deformation leads to the initiation of hydrogen-induced intergranular cracks. The </span><span lang="EN-US">Σ</span><span lang="EN-US">3 grain boundaries and the </span><span lang="EN-US">ε</span><span lang="EN-US">/</span><span lang="EN-US">γ </span><span lang="EN-US">interfaces with the orientation of the N-W orientation play a role in arresting the propagation of HICs. In addition, for TRIP steel with a large amount of PVFMs (45%), the </span><span lang="EN-US">ε</span><span lang="EN-US">-martensite with micro-orientation of ||RD at the cracks tip is more likely to cause the transgranular propagation of HICs and promote the formation of cleavage or quasi-cleavage fracture.</span></p> <p align="left"> </p> <div class="border-top py-2"><b>Posted by: </b>Jinxu Li, Prof, University of Science and Technology Beijing, China (<span class="f-sm">02-Dec-2019</span>)</div> </div> </div> </div> <div class="container_fluid"> <div class="bg-footer"> <div class="container py-4"> <div class="d-flex justify-content-center pt-4"> <div class="text-center f-sm"> <a href="/" title="Home page" class="text-grey me-2">Home</a><span class="me-1">|</span> <a href="/international-conferences/" title="Conferences" class="text-grey me-1">Conferences</a><span class="me-1">|</span> <a href="/international-exhibitions/" title="International Exhibition" class="text-grey 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Effect of microstructure and strain rate on hydrogen-induced delayed fracture of high-Mn TWIP/TRIP steels