CAJ | 학술논문

研究了四种不同 N 含量的18Mn18CrN 不锈钢的凝固模式、显微组织和元素分布.结果表明：N 含量影响18Mn18CrN合金系的凝固模式和显微组织.氮的质量分数由0.07%增加至0.72%时，实验钢的凝固模式由 F 模式转变为 A 模式，显微组织由铁素体和奥氏体魏氏两相组织转变为铁素体和奥氏体两相组织以及单相奥氏体组织. N 含量影响奥氏体相形貌，随 N 含量增加，奥氏体由板条状、针状转变为枝晶间和等轴状.枝晶间和等轴状奥氏体晶粒中存在褶皱形貌，且随着氮含量增加，褶皱数量增多.褶皱的产生与凝固过程中奥氏体相内部 Fe、Mn、Cr 元素的偏析有关，且该凝固偏析被保留至室温组织中.
연구료사충불동 N 함량적18Mn18CrN 불수강적응고모식、현미조직화원소분포.결과표명：N 함량영향18Mn18CrN합금계적응고모식화현미조직.담적질량분수유0.07%증가지0.72%시，실험강적응고모식유 F 모식전변위 A 모식，현미조직유철소체화오씨체위씨량상조직전변위철소체화오씨체량상조직이급단상오씨체조직. N 함량영향오씨체상형모，수 N 함량증가，오씨체유판조상、침상전변위지정간화등축상.지정간화등축상오씨체정립중존재습추형모，차수착담함량증가，습추수량증다.습추적산생여응고과정중오씨체상내부 Fe、Mn、Cr 원소적편석유관，차해응고편석피보류지실온조직중.
This article reports the solidification mode, microstructure, and element distribution of phases in 18Mn18CrN stainless steels with four kinds of N contents. N content significantly affects the solidification mode and microstructure of 18Mn18CrN alloy systems. The solidification mode of 18Mn18CrN stainless steels changes from Mode F to A as the N content increases from 0. 07% to 0. 72% . Additionally, the microstructure of 18Mn18CrN stainless steels changes from ferrite + austenite Widmanst?tten dual-phase structure to ferrite + austenite dual-phase structure and a single phase of austenite as the N content increases. N content also affects the morphologies of austenitic phases. The lath-like or needle-like austenite phase changes into interdendritic and equiaxed austenite phases with the increase of N content. Ridges are present in interdendritic and equiaxed austenite grains, and the amount of ridges increases as the N content increases. There is a relationship between the ridges and the segregation of Cr, Mn and Fe elements in aus-tenite phases during the solidification process. Moreover, this solidification segregation is retained to room temperature microstructure.