X-ray tomographic observation of environmental assisted cracking in heat-treated lean duplex stainless steel

X-ray tomographic observation of environmental assisted cracking in heat-treated lean duplex stainless steel
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热处理贫双相不锈钢环境辅助开裂的 X 射线断层扫描观察

DOI:
10.1016/j.corsci.2021.109363
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发表时间:
2021
期刊:
影响因子:
8.3
通讯作者:
Eguchi K
Eguchi K
中科院分区:
材料科学1区
文献类型:
--
作者:
Eguchi K

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通过X射线计算机断层扫描(X-ray CT)和截面显微组织分析,观察到热处理后贫双相不锈钢发生环境辅助开裂(EAC)。铁素体相的选择性腐蚀发生在样品表面,与内部腐蚀所施加的塑性应变触发。观察到的裂纹主要沿沿着铁素体-铁素体晶界扩展,裂纹止裂与铁素体-奥氏体晶界有关。EAC断裂过程中的裂纹扩展进行了观察,在operando。EAC的突然出现是由于韧性奥氏体相对裂纹张开的抑制。降低EAC电阻归因于氢脆效应。
The occurrence of environmental assisted cracking (EAC) has been observed in heat-treated lean duplex stainless steel via X-ray computed tomography (X-ray CT) and cross-sectional microstructure analysis. Selective corrosion of the ferrite phase occurred at the sample surface, with internal corrosion triggered by applied plastic strain. The observed cracks mainly propagated along ferrite-ferrite boundaries, with crack arrest associated with ferrite-austenite grain boundaries. Crack propagation during EAC fracture was observed, in-operando. The sudden appearance of EAC occurred due to the suppression of crack opening by ductile austenite phase. The reduced EAC resistance was attributed to hydrogen embrittlement effects.
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