Effect of strain rate on hydrogen embrittlement in low-carbon martensitic steel
Effect of strain rate on hydrogen embrittlement in low-carbon martensitic steel
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DOI：
10.1016/j.ijhydene.2016.09.188
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发表时间：
2017-02
影响因子：
7.2
通讯作者：
Yuji Momotani;A. Shibata;D. Terada;N. Tsuji
中科院分区：
文献类型：
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作者：
Yuji Momotani;A. Shibata;D. Terada;N. Tsuji
研究了应变速率对低碳马氏体钢氢脆行为的影响。随着应变速率的降低，含氢试样的伸长率显著降低。随应变速率的变化，氢相关断裂行为的特征也发生了变化。氢微印技术和电子后向散射衍射分析表明，在较低应变速率下变形有利于氢主要在奥氏体晶界上积累。这种氢积累导致沿奥氏体晶界形成微裂纹，在奥氏体晶界上或晶界附近形成脆性断裂。另一方面，当应变速率较高时，微裂纹主要在奥氏体晶粒内部形成，并发生穿晶断裂。这可能是因为在拉伸试验中，氢没有足够的时间积聚在先前的奥氏体晶界上。
This study investigated the effect of strain rate on hydrogen embrittlement behavior in a low-carbon martensitic steel. Elongation of the hydrogen-charged specimen decreased significantly with decreasing the strain rate. The characteristics of the hydrogen-related fracture behavior also changed with the strain rate. Hydrogen micro-print technique and electron backscattering diffraction analysis revealed that the deformation at a lower strain rate facilitated hydrogen to accumulate mainly on prior austenite grain boundaries. This hydrogen accumulation led to the formation of micro-cracks along prior austenite grain boundaries and brittle fracture on or in the vicinity of prior austenite grain boundaries. On the other hand, in the case of a higher strain rate, micro-cracks formed mainly inside prior austenite grains and transgranular fracture occurred. This is presumably because there was not enough time for hydrogen to accumulate on prior austenite grain boundaries during tensile test.