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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Strain Rate on Stress Corrosion Cracking of 316L Austenitic Stainless Steel in Boiling MgCl_2 Environment
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Effect of Strain Rate on Stress Corrosion Cracking of 316L Austenitic Stainless Steel in Boiling MgCl_2 Environment

机译：MgCl_2沸腾应变速率对316L奥氏体不锈钢应力腐蚀开裂的影响。

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摘要

Stress corrosion cracking behaviors of AISI 316L austenitic stainless steel at slow strain rates in two environments of air and MgCl_2 at ambient temperature and 154℃ were investigated. The results revealed that a decrease in strain rate, during testing in boiling MgCl_2 environment, led to a rigorous deterioration of the mechanical properties of the material, causing brittleness of the steel. The results obtained from fractography indicated that the samples tested in air had typical ductile fracture surface appearances, while the fracture surfaces of the samples tested in a corrosive environment showed a combination of inter-granular and transgranular fracture modes, having a brittle macroscopic appearance. The transgranular mode became predominant as strain rate decreased. The results suggested that the presence of deformation bands in front of crack tips were responsible for transgranular cracking caused by stress corrosion.
机译：研究了AISI 316L奥氏体不锈钢在空气和MgCl_2在环境温度和154℃的两种环境中在低应变速率下的应力腐蚀开裂行为。结果表明，在沸腾的MgCl_2环境中进行测试期间，应变率降低，导致材料的机械性能严重降低，从而导致钢的脆性。从断口照相术获得的结果表明，在空气中测试的样品具有典型的韧性断裂表面外观，而在腐蚀性环境中测试的样品的断裂表面显示出晶间和晶间断裂模式的组合，具有脆性的宏观外观。随着应变率的降低，跨晶模式成为主导。结果表明，裂纹尖端前存在变形带是应力腐蚀引起的跨晶裂纹的原因。

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