Hydrogen embrittlement resistance of pre-strained ultra-high-strength low alloy TRIP-aided steel
Hydrogen embrittlement resistance of pre-strained ultra-high-strength low alloy TRIP-aided steel
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DOI：
10.1007/s10704-020-00451-5
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发表时间：
2020-06
影响因子：
2.5
通讯作者：
Tomohiko Hojo;Bakuya Kumai;M. Koyama;E. Akiyama;H. Waki;H. Saitoh;A. Shiro;R. Yasuda;T. Shobu;A. Nagasaka
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文献类型：
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作者：
Tomohiko Hojo;Bakuya Kumai;M. Koyama;E. Akiyama;H. Waki;H. Saitoh;A. Shiro;R. Yasuda;T. Shobu;A. Nagasaka
研究了预应变对超高强度相变诱发塑性（TRIP）辅助贝氏体铁素体（TBF）钢氢脆性能的影响，并将其应用于汽车车架零件。具体而言，3-10%的拉伸预应变抑制氢诱导的机械降解相对于总伸长率（充氢后的预应变伸长率），而12-15%的预应变试样没有表现出充氢后的伸长率。3-10%预应变的有利效果归因于抑制与残余奥氏体相关的裂纹萌生。具体而言，通过预应变的TRIP降低了充氢前残余奥氏体的体积分数，从而降低了优先裂纹萌生位点和扩展路径的现有概率。相反，高预应变如12-15%由于加工硬化而不能有效地工作，导致氢脆敏感性增加和由于位错倍增而导致氢含量显著增加。
In the study, the pre-strain effect on hydrogen embrittlement property of the ultra-high-strength transformation-induced plasticity (TRIP)-aided bainitic ferrite (TBF) steel was investigated towards application for automobile frame parts. Specifically, 3–10% tensile pre-strain suppressed hydrogen-induced mechanical degradation relative to total elongation (pre-strainelongation after hydrogen charging) while 12–15% pre-strained specimen did not exhibit elongation after hydrogen charging. The advantageous effect of the 3–10% pre-strain was attributed to the suppression of crack initiation related to retained austenite. Specifically, the TRIP by pre-straining decreased the volume fraction of retained austenite before hydrogen charging, thereby reducing existing probabilities of preferential crack initiation sites and propagation paths. Conversely, high pre-strain such as 12–15% does not effectively work due to work hardening resulting in increases in hydrogen embrittlement susceptibility and a significant increase in hydrogen content due to the multiplication of dislocations.