固溶时效对超高氮奥氏体不锈钢析出行为的影响Influence of solution treatment and aging process on precipitation behavior of super-high nitrogen austenitic stainless steel
马玉喜,荣凡,周荣,蒋业华
摘要(Abstract):
用金相法、电镜观察等研究固溶+时效处理过程中超高氮奥氏体不锈钢氮化物及金属间相析出行为。结果表明:在超高氮奥氏体不锈钢中,随850℃等温时间的延长Cr2N析出过程为:沿晶界链条状析出→沿三晶界交汇处胞状析出并伴随少量的晶内析出→逐渐向晶内生长并与晶内析出相连呈层片状布满整个晶面,Cr2N的析出形态多以颗粒状、蠕虫状、层片状、菊花状分布;随着氮化物的析出伴随有σ相析出,这些金属间相多呈片状出现。探讨了各析出物的析出机理;通过析出物形貌TEM观察和选区衍射分析(SAD)确定了氮化物晶体结构及其与基体的位向关系;氮主要是以Cr2N和过饱和间隙原子的形式存在。
关键词(KeyWords): 高氮奥氏体不锈钢;固溶时效;氮化物;晶体结构
基金项目(Foundation): 国家重点基础研究规划(973)项目(2004CB619103)
作者(Author): 马玉喜,荣凡,周荣,蒋业华
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