欧平,孙坚,崔正强,杨昌顺

• 1:上海交通大学材料科学与工程学院
• 2:上海发电设备成套设计研究院

摘要(Abstract)：

利用扫描和透射电子显微镜对Super304H奥氏体耐热钢在650℃×5000 h时效处理后的组织结构进行观察与分析。结果表明Super304H奥氏体钢中存在固溶处理过程未溶解的尺寸约为2μm块状、150 nm球状NbC以及1μm圆形夹杂物,这些NbC与基体不存在特定的位向关系,时效过程析出的尺寸约为8 nm多边形状NbC则与基体存在立方取向关系;M23C6可以NbC为核心析出形成双层结构,偶尔发现在基体单独析出,M23C6与奥氏体存在立方取向关系,在奥氏体晶界析出的多边形状M23C6与基体也存在立方取向关系,而椭圆颗粒状M23C6则不存在这种关系;奥氏体基体内析出大量尺寸约为35 nm的富Cu相与基体存在共格关系,富Cu析出相对Super304H奥氏体钢强化作用主要来自共格强化效应。

关键词(KeyWords)： Super304H奥氏体耐热钢;碳化物;富Cu相;析出

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目(50931003)

作者(Author): 欧平,孙坚,崔正强,杨昌顺

DOI: 10.13289/j.issn.1009-6264.2014.05.017

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