Effect of Nanostructure on Hydrogen Embrittlement Resistance of the Severely Deformed 316LN Austenitic Steel

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Hydrogen Embrittlement Resistance of the Severely Deformed 316LN Austenitic Steel</title> <meta name="description" content="Effect of Nanostructure on Hydrogen Embrittlement Resistance of the Severely Deformed 316LN Austenitic Steel"> <meta name="keywords" content="diffusible hydrogen, heterogeneous nanostructure, homogeneous nanostructure, hydrogen embrittlement"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a 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87352</div> </div> </div> </div> <div class="card publication-listing mt-3 mb-3"> <h5 class="card-header" style="font-size:.9rem">Effect of Nanostructure on Hydrogen Embrittlement Resistance of the Severely Deformed 316LN Austenitic Steel</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Frank%20Jaksoni%20Mweta">Frank Jaksoni Mweta</a>, <a href="https://publications.waset.org/abstracts/search?q=Nozomu%20Adachi"> Nozomu Adachi</a>, <a href="https://publications.waset.org/abstracts/search?q=Yoshikazu%20Todaka"> Yoshikazu Todaka</a>, <a href="https://publications.waset.org/abstracts/search?q=Hirokazu%20Sato"> Hirokazu Sato</a>, <a href="https://publications.waset.org/abstracts/search?q=Yuta%20Sato"> Yuta Sato</a>, <a href="https://publications.waset.org/abstracts/search?q=Hiromi%20Miura"> Hiromi Miura</a>, <a href="https://publications.waset.org/abstracts/search?q=Masakazu%20Kobayashi"> Masakazu Kobayashi</a>, <a href="https://publications.waset.org/abstracts/search?q=Chihiro%20Watanabe"> Chihiro Watanabe</a>, <a href="https://publications.waset.org/abstracts/search?q=Yoshiteru%20Aoyagi"> Yoshiteru Aoyagi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Advances in the consumption of hydrogen fuel increase demands of high strength steel pipes and storage tanks. However, high strength steels are highly sensitive to hydrogen embrittlement. Because the introduction of hydrogen into steel during the fabrication process or from the environment is unavoidable, it is essential to improve hydrogen embrittlement resistance of high strength steels through microstructural control. In the present study, the heterogeneous nanostructure with a tensile strength of about 1.8 GPa and the homogeneous nanostructure with a tensile strength of about 2.0 GPa of 316LN steels were generated after 92% heavy cold rolling and high-pressure torsion straining, respectively. The heterogeneous nanostructure is composed of twin domains, shear bands, and lamellar grains. The homogeneous nanostructure is composed of uniformly distributed ultrafine nanograins. The influence of heterogeneous and homogenous nanostructures on the hydrogen embrittlement resistance was investigated. The specimen for each nanostructure was electrochemically charged with hydrogen for 3, 6, 12, and 24 hours, respectively. Under the same hydrogen charging time, both nanostructures show almost the same concentration of the diffusible hydrogen based on the thermal desorption analysis. The tensile properties of the homogenous nanostructure were severely affected by the diffusible hydrogen. However, the diffusible hydrogen shows less impact on the tensile properties of the heterogeneous nanostructure. The difference in embrittlement behavior between the heterogeneous and homogeneous nanostructures was elucidated based on the mechanism of the cracks' growth observed in the tensile fractography. The hydrogen embrittlement was suppressed in the heterogeneous nanostructure because the twin domain became an obstacle for crack growth. The homogeneous nanostructure was not consisting an obstacle such as a twin domain; thus, the crack growth resistance was low in this nanostructure. <iframe src="https://publications.waset.org/abstracts/131052.pdf" style="width:100%; height:400px;" frameborder="0"></iframe> <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=diffusible%20hydrogen" title="diffusible hydrogen">diffusible hydrogen</a>, <a href="https://publications.waset.org/abstracts/search?q=heterogeneous%20nanostructure" title=" heterogeneous nanostructure"> heterogeneous nanostructure</a>, <a href="https://publications.waset.org/abstracts/search?q=homogeneous%20nanostructure" title=" homogeneous nanostructure"> homogeneous nanostructure</a>, <a href="https://publications.waset.org/abstracts/search?q=hydrogen%20embrittlement" title=" hydrogen embrittlement"> hydrogen embrittlement</a> </p> <a href="https://publications.waset.org/abstracts/131052/effect-of-nanostructure-on-hydrogen-embrittlement-resistance-of-the-severely-deformed-316ln-austenitic-steel" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/131052.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">123</span> </span> </div> </div> </div> </main> <footer> <div id="infolinks" class="pt-3 pb-2"> <div class="container"> <div style="background-color:#f5f5f5;" class="p-3"> <div class="row"> <div class="col-md-2"> <ul class="list-unstyled"> About <li><a href="https://waset.org/page/support">About Us</a></li> <li><a href="https://waset.org/page/support#legal-information">Legal</a></li> <li><a target="_blank" rel="nofollow" href="https://publications.waset.org/static/files/WASET-16th-foundational-anniversary.pdf">WASET celebrates its 16th foundational 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Effect of Nanostructure on Hydrogen Embrittlement Resistance of the Severely Deformed 316LN Austenitic Steel