254SMO不锈钢铸态组织及其高温固溶处理工艺

As-cast microstructure and high temperature solution treatment process of 254SMO stainless steel

通过显微组织观察和背散射电子扫描观察了不同时间、不同温度的固溶处理对超级奥氏体不锈钢254SMO铸态组织的影响,并采用电子探针技术观察了钢中σ相的溶解过程。结果表明,随着固溶时间和温度的增加,不锈钢中的铸态枝晶组织逐渐消融,偏析逐渐消除,σ相逐渐溶解并转化为δ相(铁素体)。其中1280℃×9 h固溶处理的效果最好。

Effect of solution treatment at different temperatures and time on the as-cast microstructure of super austenitic stainless steel 254SMO was studied by microstructure observation and back scattering electron scanning,and theσphase dissolution process in the steel was studied by electron microprobe.The results show that with the increase of solution treatment time and temperature,the as-cast dendrite structure and the segregation gradually disappear,and theσphase gradually dissolves and transforms intoδphase(ferrite).The optimum solid solution treatment process is 1280℃×9 h.