Effect of strain rate on hydrogen embrittlement susceptibility of twinning-induced plasticity steel pre-charged with high-pressure hydrogen gas
Effect of strain rate on hydrogen embrittlement susceptibility of twinning-induced plasticity steel pre-charged with high-pressure hydrogen gas
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DOI：
10.1016/j.ijhydene.2016.06.259
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发表时间：
2016-09
影响因子：
7.2
通讯作者：
B. Bal;M. Koyama;G. Gerstein;H. Maier;K. Tsuzaki
中科院分区：
文献类型：
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作者：
B. Bal;M. Koyama;G. Gerstein;H. Maier;K. Tsuzaki
使用饱和氢量的 Fe-23Mn-0.5C 钢研究了拉伸应变率对孪晶诱发塑性 (TWIP) 钢的氢致力学和显微组织特征的影响。为了获得均匀的氢气分布，在 423 K 下进行高压氢气预充。与之前的氢脆研究类似，当应变速率从 0.6 × 10−3 降低到 0.6 × 10−4s−1 时，拉伸性能的恶化变得明显。从显微组织特征来看，预充氢降低了变形孪晶板的厚度，并且使位错滑移局域化。此外，随着应变率的降低，断裂表面氢致准解理特征的刻面变得更加光滑。在这项研究中，我们提出氢偏析、滑移局部化和双板减薄的综合效应导致 TWIP 钢的氢脆，特别是在低应变率下。
The effects of tensile strain rate on the hydrogen-induced mechanical and microstructural features of a twinning-induced plasticity (TWIP) steel were investigated using a Fe-23Mn-0.5C steel with a saturated amount of hydrogen. To obtain a homogeneous hydrogen distribution, high-pressure hydrogen gas pre-charging was performed at 423 K. Similar to previous studies on hydrogen embrittlement, the deterioration in the tensile properties became distinct when the strain rate was decreased from 0.6 × 10−3to 0.6 × 10−4s−1. In terms of microstructural features, hydrogen-precharging decreased the thickness of deformation twin plates, and it localized dislocation slip. Moreover, facets of the hydrogen-induced quasi-cleavage feature on the fracture surface became smoother with decreasing strain rate. In this study, we proposed that a combined effect of hydrogen segregation, slip localization, and thinning of twin plates causes the hydrogen embrittlement of TWIP steels, particularly at a low strain rate.