Study of hydrogen-induced delayed fracture in high-Mn TWIP/TRIP steels during in situ electrochemical hydrogen-charging: Role of microstructure and strain rate in crack initiation and propagation
Study of hydrogen-induced delayed fracture in high-Mn TWIP/TRIP steels during in situ electrochemical hydrogen-charging: Role of microstructure and strain rate in crack initiation and propagation
复制标题
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
DOI：
10.1016/j.corsci.2019.108191
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发表时间：
2020-01-01
影响因子：
8.3
通讯作者：
Li, Jinxu
中科院分区：
文献类型：
--
作者：
Fu, Hao;Wang, Wei;Li, Jinxu
采用慢应变速率拉伸试验研究了高Mn孪晶/相变诱发塑性（TWIP/TRIP）钢中氢致裂纹（HIC）的萌生和扩展规律。对于ε-马氏体（PVFM）相体积分数为10%的TCEP/TRIP钢，HIC的萌生在1 × 10（-6）s（-1）时主要是位错滑移，而在1 × 10（-5）s（-1）时主要是形变孪晶。对于PVFM含量为45%的TRIP钢，ε马氏体的不一致变形促进HIC的产生。具有Nishiyama-Wassermann取向的σ 3晶界和γ/γ相界面都能阻止HIC的扩展。裂纹尖端平行于RD取向的ε马氏体更容易诱发穿晶裂纹扩展。
The initiation and propagation of hydrogen-induced cracks (HICs) in high-Mn twinning/transformation-induced plasticity (TWIP/TRIP) steels were explored by slow strain rate tension test. For TWIP/TRIP steels with 10% phase volume fractions of epsilon-martensite (PVFM), the initiation of HICs is dominated by dislocation slips at 1 x 10(-6) s(-1), but, at 1 x 10(-5) s(-1), it is dominated by deformation twins. For TWIP/TRIP steels with 45% PVFM, inconsistent deformation of epsilon-martensite promotes HICs initiation. Both Sigma 3 grain boundary and gamma/epsilon phase interface with Nishiyama-Wassermann orientation could prevents HICs propagation. And epsilon-martensite with parallel to RD microscopic orientation at the crack tip is more likely to induce transgranular crack propagation.