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Effect of cutting method on hydrogen embrittlement of high-Mn TWIP steel

机译：切削方法对高锰TWIP钢氢脆化的影响

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摘要

The objective of this study was to fill a knowledge gap about the effect of cut-edge properties on hydrogen embrittlement (HE) of a cold rolled Fe-20Mn-0.35C-1A1-1.6Cr TWIP (twinning induced plasticity) steel. Slow strain rate tests were performed on hydrogen uncharged and hydrogen pre-charged specimens prepared by four cutting methods: electrical discharge machining, laser cutting, abrasive waterjet cutting, and blanking. It was observed that the laser-cut and hydrogen pre-charged specimens showed the highest total elongation (62%) during tensile test, whereas the blanked and hydrogen pre-charged specimens showed the lowest total elongation (30%). The high HE susceptibility of blanked specimens was explained by the local high dislocation density assisted by the hydrogen-enhanced localized plasticity mechanism. Furthermore, tensile residual stresses generated by blanking facilitated the hydrogen diffusion and the growth of hydrogen-assisted cracks.
机译：这项研究的目的是填补有关尖端特性对冷轧Fe-20Mn-0.35C-1A1-1.6Cr TWIP（孪生诱导可塑性）钢的氢脆性（HE）影响的知识空白。对通过以下四种切割方法制备的未充氢和预充氢样品进行了慢应变速率测试：放电加工，激光切割，水射流切割和落料。观察到，在拉伸试验中，激光切割和氢预充电的样品显示出最高的总伸长率（62％），而空白和氢预充电的样品显示了最低的总伸长率（30％）。用氢增强的局部可塑性机制辅助的局部高位错密度解释了空白样品的高HE敏感性。此外，由落料产生的拉伸残余应力促进了氢的扩散和氢辅助裂纹的生长。

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