摘要
采用光学显微镜、扫描电镜及透射电镜等分析手段,研究了S30432钢在不同状态下的析出相.结果表明:持久试验和实际运行后材料中的析出相较多,其中富Cu相和NbC(N)析出相颗粒尺寸较小,长大不明显;Cr23C6相和一次析出相NbC(N)数量较多,长大明显,其中Cr23C6相沿晶界析出,使晶界强度降低,而异常粗大的一次析出相NbC(N)颗粒导致钢管使用性能降低,甚至影响S30432钢管的长期、安全和稳定运行.
Precipitates in S30432 steel tubes that had respectively experienced creep-rupture test and actual service operation were analyzed by ways of optical microscopy(OM),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).Results show that a variety of precipitates will form in S30432 steel tubes at above two different states,in which,relatively small Cu-rich and NbC(N) particles,more and coarse(Cr_(23)C_6) and primitive NbC(N) precipitates,are to be observed.Precipitation of(Cr_(23)C_6)(along) grain-boundary will weaken the strength of the boundary,while coarse primitive NbC(N) particles worsen service properties of the tube,which may even effect safety and stable operation of (S30432) tubes.
出处
《动力工程学报》
CAS
CSCD
北大核心
2010年第4期281-283,共3页
Journal of Chinese Society of Power Engineering
基金
上海市科委国产ASTMA213MS30432钢管长时组织与持久性能研究资助项目(09521101200)