摘要
研究了动应力（往复弯曲疲劳应力）对氯化物溶液中不锈钢点蚀敏感性的促进作用．在固溶态３１６Ｌ不锈钢表面点蚀孔中产生了明显的非敏化态晶间腐蚀．在点蚀孔内受腐蚀晶界处孕育产生了初态腐蚀疲劳裂纹，裂纹由沿晶转变为穿晶扩展，形成主裂纹并继续扩展直至材料失稳断裂．阐述了在动应力和侵蚀性介质联合作用下ＣＦ裂纹萌生的过程机理．论述了动应力－环境介质－材料特性在多种腐蚀类型交互作用中的贡献和相关性．
The acceleration effect of dynamic cyclic stress on the susceptibility to pitting corrosion for stainless steel 316L in chloride solution was investigated. In the pits on surface of solution treated stainless steel appeared obviously the nonsensitive intergranular corrosion. At the corroded grainboundaries in pits the corrosion fatigue cracks were initiated. The CF cracks propagated and transformed from intergranular to transgranular, forming principal crack and propagating continuously until failure of the material. The transformation course and its effect mechanism from pitting corrosion to CF failure under cyclic stress were investigated. The interaction of multiple corrosion types for stainless steel was proposed and confirmed by the experiment. Under given condition some different corrosion types initiated and progagated one after another or simultaneously, and one corrosion type was accelerated or transformed to another corrosion type. The environmental conditions and material characteristic f
出处
《腐蚀科学与防护技术》
CAS
CSCD
1999年第1期24-31,共8页
Corrosion Science and Protection Technology
基金
863计划新材料领域资助
关键词
不锈钢
腐蚀疲劳
氯化物溶液
裂纹萌生机理
stainless steel, pitting corrosion, intergranular corrosion, corrosion fatigue, interaction of multiple corrosion types or the interaction and the transformation effect between different corrosion types were discussed.
