Ni Cr Fe Mo Co Cu W合金宏观“黑斑”和“白斑”缺陷的形成  

Formation of Macroscopic "Freckles" and "White Speckles" in A Ni\|Cr\|Fe\|Mo\|Co\|Cu\|W Alloy

作　　者：刘雅晶[1] 李玉清 谢锡善[3] 董建新[3] JohnH.Tundermann 

机构地区：[1]AuburnUniversity [2]大冶特殊钢股份有限公司 [3]北京科技大学 [4]IncoAlloysInternational

出　　处：《特殊钢》1999年第5期15-19,共5页Special Steel

摘　　要：研究了ＮｉＣｒＦｅＭｏＣｏＣｕＷ 合金宏观“黑斑”和“白斑”缺陷的形成机制。“黑斑”区富集元素主要以数量较多，尺寸较大的富含钼、钨的Ｍ６Ｃ和ＡＢ３Ｃ 等相和数量较多的粒状Ｍ６Ｃ 的形式存在于晶界上，因界面效应使晶界相对易受侵蚀；“白斑”区晶界主要富含钼、钨的μ相，比富含铬的Ｍ６Ｃ 基底区耐晶界腐蚀。The formation mechanism on the macroscopic 'freckles' and 'white speckles' in Ni\|Cr\|Fe\|Mo\|Co\|Cu\|W alloy has been studied. The tungsten and molybdenum enriched was present in a large number of M\-6C and AB\-3C etc with larger size and a considerable number of granular M\-6C at grain boundaries in the macroscopic 'freckles', therefore the boundaries was etched easily. The intergranular corrosion resistance of 'white speckles' region, in which the μ phase enriched tungsten and molybdenum existed, was better than that base region which had enriched chromium M\-6C phase.

关 键 词：黑斑 白斑 钨 钼 高温合金 偏析 

分 类 号：TG132.32[一般工业技术—材料科学与工程]