Effect of Prestrain on Hydrogen-Induced Delayed Cracking for Medium Mn Steels
Effect of Prestrain on Hydrogen-Induced Delayed Cracking for Medium Mn Steels
复制标题
预应变对中锰钢氢致延迟开裂的影响
DOI：
10.1007/s11665-020-04706-z
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发表时间：
2020-03
影响因子：
2.3
通讯作者：
Qiao L. J.
中科院分区：
文献类型：
--
作者：
Liu Q. Y.;Yan Y.;Xu J. P.;Yang S. Q.;Li J. X.;Su Y. J.;Qiao L. J.
中锰钢是新一代汽车用超高强度材料。然而，尽管具有优异的延展性，但它们可能遭受延迟开裂，从而引起严重关注。在这项研究中，几个中锰钢进行了测试与不同的预应变和充氢条件。研究了预应变和氢含量对氢致延迟开裂行为的交互作用和协同效应。恒载荷动态充氢过程中，氢致开裂（HIC）门槛应力降低。在动态充氢过程中，M7 B和M10 B钢的归一化应力强度因子σ/σ和相应的门槛应力σ_s随预应变的增加而急剧下降。这是因为残余奥氏体的体积分数随着预应变的增加而减少。同样，随着预应变的增加，σ ε减小，临界氢含量急剧下降。对于M7 C，预应变对阈值应力和氢浓度的影响小于M7 B。这是因为不同的处理工艺导致残余奥氏体的不同稳定性。通过对断口形貌的观察，发现中锰钢的断口呈现出不同的断裂特征，如韧窝断裂、沿晶断裂和穿晶断裂。
Medium Mn steels are a class of the new-generation ultra-high-strength materials used in automotives. However, despite excellent ductility, they may suffer from delayed cracking and thus cause serious concerns. In this study, several medium Mn steels were tested with different prestrain and hydrogen charging conditions. The interaction and synergistic effects of prestrain and hydrogen content on hydrogen-induced delayed cracking behavior are investigated. The threshold stress of hydrogen-induced cracking (HIC) decreased during dynamic hydrogen charging under a constant load. In the process of dynamic hydrogen charging, for M7B and M10B steels, the normalized stress intensity factorσ/σband the corresponding threshold stressσHICdecreased sharply as prestrain increased. This is because the volume fraction of retained austenite decreased with an increase in prestrain. Similarly,σHICwas reduced and the critical hydrogen content dropped drastically with increasing prestrain. For M7C, the influence of prestrain on threshold stress and hydrogen concentration was less than that of M7B. This is because the different treatment processes leads to a different stability of the retained austenite. By observing the SEM fractographs, the fracture surface of medium Mn steels showed different fracture characteristics, such as dimple fractures and intergranular and transgranular modes.
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DOI：
10.1017/cbo9781139207249.009
发表时间：
2012
期刊：
--
影响因子：
--
作者：
W. Marsden
通讯作者：
W. Marsden
原位电化学充氢过程中高锰 TWIP/TRIP 钢氢致延迟断裂的研究：微观结构和应变速率在裂纹萌生和扩展中的作用
影响因子：
8.3
作者：
Fu, Hao;Wang, Wei;Li, Jinxu
通讯作者：
Li, Jinxu
影响因子：
1.8
作者：
T. Furukawa
通讯作者：
T. Furukawa
影响因子：
4
作者：
Qingyang Liu;Shuquan Yang;Liancheng Shen;Qingjun Zhou;Lijie Qiao;Yu Yan
通讯作者：
Yu Yan
影响因子：
9.4
作者：
M. Nagumo;T. Yagi;H. Saitoh
通讯作者：
M. Nagumo;T. Yagi;H. Saitoh