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-strain $$+$$ + elongation 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.

中文翻译：

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预应变超高强低合金TRIP辅助钢的抗氢脆性能

在这项研究中，研究了超高强度相变诱导塑性 (TRIP) 辅助贝氏体铁素体 (TBF) 钢的预应变对氢脆性能的影响，以用于汽车框架部件。具体而言，相对于总伸长率（预应变 $$+$$ + 充氢后伸长率），3-10% 的拉伸预应变抑制了氢诱导的机械退化，而 12-15% 的预应变试样​​在氢后没有表现出伸长率收费。3-10% 预应变的有利效果归因于与残余奥氏体相关的裂纹萌生的抑制。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点和传播路径的现有概率。