核电站主管道Z3CN20.09M不锈钢中金属间相的析出行为  

PRECIPITATION BEHAVIOR OF THE INTERMETALLIC PHASES IN Z3CN20.09M STAINLESS STEEL FOR PRIMARY COOLANT PIPES OF NUCLEAR POWER PLANT

作　　者：王永强[1] 韩军[1] 杨滨[1] 武焕春[1] 王西涛[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《金属学报》2013年第4期415-420,共6页Acta Metallurgica Sinica

基　　金：国家高技术研究发展计划项目2012AA03A507和2008AA031702;新金属材料国家重点实验室自主研究课题项目资助~~

摘　　要：研究了压水堆核电站一回路主管道用Z3CN20.09M铸造奥氏体不锈钢中金属间相的析出行为.利用Image-proPlus 6.0软件统计了时效处理后不锈钢中析出金属间相的数量,获得了金属间相的时间-温度-转变(TTT)曲线.结果显示,Z3CN20.09M中析出的金属间相为M_(23)C_6和σ相,析出温度范围分别为600—900℃和600—840℃,其中750℃时析出最快.研究表明,M_(23)C_6首先在α/γ相界析出,然后σ相在铁素体相内形成.M_(23)C_6和σ相在Z3CN20.09M中固溶化的温度分别为900和850℃.850℃时,M_(23)C_6相的析出量随时间延长先增多后减少.The precipitation behavior of the intermetallic phases in a Z3CN20.09M cast austenite stainless steel （CASS） which has been widely used in primary coolant pipes of nuclear power plants has been investigated. The content of the intermetallic phases precipitated in the CASS was calculated by using Image-pro Plus 6.0 software. And then a time-temperature-transformation （TTT） diagram for the intermetallic phases was got. The results showed that the M23C6 and a phases were precipitated in the steel during 600--900 l~ and 600--840 E respectively. The fastest precipitation velocity for the intermetallic phases occurs at 750 l~. Moreover, the M23C6 was found to precipitate first at ferrite/austenite phase boundaries, and then a phase formed in ferrite. The solutionizing temperatures for the M23C6 and a phases are 900 and 850 E respectively. The volume fraction of the M23C6 in the specimen aged at 850 increases with the increase of aging time first and then decreases.

关 键 词：Z3CN20.09M不锈钢 M_23C_6 Σ相 析出行为 

分 类 号：TG142.71[一般工业技术—材料科学与工程]