Effect of hydrogen on evolution of deformation microstructure in low-carbon steel with ferrite microstructure
Effect of hydrogen on evolution of deformation microstructure in low-carbon steel with ferrite microstructure
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DOI：
10.1016/j.actamat.2021.117549
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发表时间：
2022-02-15
期刊：
影响因子：
9.4
通讯作者：
Tsuji, Nobuhiro
中科院分区：
文献类型：
--
作者：
Okada, Kazuho;Shibata, Akinobu;Tsuji, Nobuhiro
采用SEM-背散射电子能谱、SEM-电子背散射电子能谱、透射电子显微镜和中子衍射等方法对2 Mn-0.1C钢充氢后的形变组织进行了研究。讨论了氢致准解理断裂沿{011}面沿着断裂的微观机制。结果发现，氢增加螺位错刃位错的相对速度，导致缠结位错形态，即使在变形的初始阶段（e = 3%）。此外，在变形后期（e = 20%）的螺旋位错密度增加在氢的存在下。根据实验结果，提出了高密度空位沿着{011}滑移面的聚集是由于螺型位错的微动拖曳作用，空位的聚集导致了沿着{011}滑移面的氢相关准解理断裂。(c)2021年，任作家。由Elsevier Ltd代表Acta Materialia Inc.发布这是CC BY许可下的开放获取文章（http://creativecommons.org/licenses/by/4.0/）
In this study, the deformation microstructure of hydrogen-charged ferritic-pearlitic 2Mn-0.1C steel was characterized using SEM-BSE, SEM-EBSD, TEM, and neutron diffraction. The microscopic mechanism of hydrogen-related quasi-cleavage fracture along the {011} planes was also discussed. It was found that hydrogen increased the relative velocity of screw dislocations to edge dislocations, leading to a tangled dislocation morphology, even at the initial stage of deformation ( e = 3%). In addition, the density of screw dislocations at the later stage of deformation ( e = 20%) increased in the presence of hydrogen. Based on the experimental results, it is proposed that a high density of vacancies accumulated along {011} slip planes by jog-dragging of screw dislocations, and coalescence of the accumulated vacancies led to the hydrogen-related quasi-cleavage fracture along the {011} slip planes. (c) 2021 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )