氮气氛下的区域熔炼对304不锈钢显微组织的影响

用区域熔炼法制备含氮304奥氏体不锈钢。研究了氮气压力对显微组织以及奥氏体和铁素体取向关系的影响。结果表明,随着氮气压力的增加,氮含量增加,奥氏体的体积分数逐渐增加,铁素体逐渐减少。高的氮气压力会促进包晶转变进程,使更多的铁素体转变为奥氏体;随着氮气压的增加,铁素体与热流方向一致性也会变差。此外,随着氮气压的增加,铁素体与奥氏体的取向关系不仅会保持原有的K-S关系,也会出现N-W关系。

Effect of Zone Melting on Microstructure of 304 Stainless Steele under Nitrogen Atmosphere

Nitrogen containing 304 austenitic stainless steel was prepared by zone melting method. The effect of nitrogen pressure on microstructure and orientation of austenite and ferrite was investigated. The results show that with the increase of nitrogen pressure and the content of nitrogen, the volume fraction of austenite increased and ferrite decreased. The increase of nitrogen pressure will promote the peritectic transformation process and make more ferrite transform into austenite. With the increase of nitrogen pressure, the consistency of ferrite and heat flow direction will become worse. In addition, with the increase of nitrogen pressure, the orientation relationship between ferrite and austenite will not only maintain the original K-S relationship, but also the N-W relationship.