北京科技大学学报Issue(11)：1490-1496,7.DOI:10.13374/j.issn1001-053x.2014.11.010
含氮不锈钢凝固模式及显微组织研究
Solidification mode and microstructure of nitrogenous stainless steels
摘要
Abstract
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 Widmanstätten 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.关键词
不锈钢/氮含量/凝固/显微组织/偏析Key words
stainless steel/nitrogen content/solidification/microstructure/segregation分类
矿业与冶金引用本文复制引用
房菲,李静媛,王一德..含氮不锈钢凝固模式及显微组织研究[J].北京科技大学学报,2014,(11):1490-1496,7.基金项目
“十二五”国家科技支撑计划资助项目(2012BAE04B02) （2012BAE04B02）
国家自然科学基金资助项目(51174026) （51174026）
