两种Fe-Ni-Cr系气阀合金中的析出相  

Precipitates in Two Kinds of Fe-Ni-Cr Valve Alloys

作　　者：王立民[1] 胡日 Wang Limin;Hu Ri(Special Steel Research Institute,Central Iron and Steel Research Institute,Beijing 100081,China;High Temperature Material Research Institute,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081 [2]钢铁研究总院高温材料研究所,北京100081

出　　处：《稀有金属材料与工程》2022年第9期3323-3329,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51971226);国家重点研发计划(2017YFB0305203)。

摘　　要：采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及X射线衍射仪(XRD)等对46Fe-33Ni-15Cr和50Fe-27Ni-20Cr2种气阀合金中的析出相进行研究。结果表明,固溶时效后,46Fe-33Ni-15Cr合金中有γy相、σ相和MC相,而50Fe-27Ni-20Cr合金中有γy相、σ相、MC相和Laves相;46Fe-33Ni-15Cr合金中的γy相有球状和胞状2种形态,50Fe-27Ni-20Cr合金中的γy相都呈球状,尺寸略小,为20~40 nm;46Fe-33Ni-15Cr合金中的σ相呈条状沿晶界分布,50Fe-27Ni-20Cr合金中的σ相呈针状与晶界呈一定位向分布。在700℃时效1000 h,随着时效时间的延长,46Fe-33Ni-15Cr中的σ相数量增长幅度远大于50Fe-27Ni-20Cr,时效1000~2000 h,两者相差不大。Precipitates in 46Fe-33Ni-15Cr and 50Fe-27Ni-20Cr valve alloys were investigated by SEM,TEM and XRD.The results show that 46Fe-33Ni-15Cr alloy contains γy,σ and MC phase after solution and aging,while 50Fe-27Ni-20Cr alloy contains γy,σ,MC and Laves phase.The γy phase has two patterns,spherical and cellular in 46Fe-33Ni-15Cr alloy.But γy phase is spherical in 50Fe-27Ni-20Cr alloy,and its size is 20~40 nm,which is smaller than that in 46Fe-33Ni-15Cr alloy.The σ phase distributes in strip on the grain boundary in 46Fe-33Ni-15Cr alloy,but it precipitates in needle shape along the grain boundary in a certain orientation in 50Fe-27Ni-20Cr.After aging at 700 ℃ for 1000 h,the amount of σ phase in 46Fe-33Ni-15Cr increases more rapidly than that in 50Fe-27Ni-20Cr alloy with the increase of aging time.The amount increasing extends of σ phases of two alloys are almost the same after aging for 1000~2000 h.

关 键 词：46Fe-33Ni-15Cr合金 50Fe-27Ni-20Cr合金 析出相 γy相 Σ相 

分 类 号：TG142.1[一般工业技术—材料科学与工程]