Effect of machining on stress corrosion crack initiation in warm-forged type 304L stainless steel in high temperature water
Effect of machining on stress corrosion crack initiation in warm-forged type 304L stainless steel in high temperature water
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DOI：
10.1016/j.actamat.2018.11.046
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发表时间：
2019-02-15
期刊：
影响因子：
9.4
通讯作者：
Scenini, Fabio
中科院分区：
文献类型：
--
作者：
Chang, Litao;Volpe, Liberato;Scenini, Fabio
采用热锻304L不锈钢试样在高温氢化水中进行慢应变速率拉伸试验，研究了加工对应力腐蚀裂纹萌生的影响。在试验前对加工表面的粗糙度、残余应力和横截面显微组织进行了表征，并在试验后进行了平面视图和横截面检查。结果表明：加工形成了外层超细晶、内层高度变形的变形层；与高度抛光的无变形表面相比，超细晶层促进了材料更均匀的氧化，增强了材料的抗SCC起爆能力，后者引发了更多的晶间裂纹。讨论了SCC在材料中引发的机理。(C) 2018材料学报Elsevier Ltd.出版。
Warm-forged Type 304L stainless steel specimens have been tested in high temperature hydrogenated water under slow strain rate tensile test conditions to investigate the effect of machining on stress corrosion crack initiation. Roughness, residual stress and cross-section microstructures of the as machined surfaces were characterized prior to the tests, and both plan-view and cross-section examinations were performed post-test. The results indicated that machining produced a deformation layer characterized by an ultrafine-grained outer layer and a highly deformed inner layer. The ultrafine-grained layer promoted a more uniform oxidation and enhanced SCC initiation resistance of the material compared to the highly polished deformation-free surfaces, which initiated significantly more intergranular cracks. The mechanisms for SCC initiation in the material have been discussed. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd.