用俄歇电子能谱等方法研究了30Cr 3 SiNiMoWV 超高强度钢回火马氏体组织中原奥氏体晶界上的元素偏聚及其与应力腐蚀沿晶断裂之间的关系。结果表明,在原奥氏体晶界上有明显的碳和磷偏聚。晶界是一个高碳区,存在着一个碳化物微层,磷偏聚在晶界上呈随机性分布。碳化物微层与基体间的界面对氢的强捕集作用及其促进阳极溶解局部化,以及磷对氢原子化合成氢分子的抑制作用,使该钢种易于发生应力腐蚀沿晶断裂。
The characteristics of prior austenitic grain boundaries in tempered martensitic microstructure in relation to intergranular stress corrosion cracking of 30Cr3SiNiMoWV ultra-high strength steels were investigated mainly with Auger electron spectroscopy.The results showed that carbon and phosphorus segregated apparently at the grain boundaries.There is a very thin layer of carbide at the carbon enriched grain boundaries, where segregated phosphorus distributes randomly.The basic reason why this steel is susceptible to intergranular stress corrosion cracking is that the interface between the carbide layer and the matrix provides a strong trap for hydrogen and promotes the localization of anodic dissolution, while phosphorus hinders the formation of hydrogen molecules from hydrogen atoms.
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