北京科技大学学报Issue(6)：768-779,12.DOI:10.13374/j.issn1001-053x.2014.06.010
18Mn18Cr 高氮钢析出相特征及形成机制
Characteristics and forming mechanism of precipitates in 18Mn18Cr high nitrogen steel
房菲 1李静媛 1王一德1
作者信息
- 1. 北京科技大学材料科学与工程学院，北京 100083
- 折叠
摘要
Abstract
The effects of carbon and nitrogen contents on the characteristics and forming mechanism of precipitates in as-cast and aged 18Mn18Cr high nitrogen steels were investigated by optical microscopy, scanning electron microscopy, electron probe micro-analy-sis, transmission electron microscopy and thermodynamics calculation (Thermo-Calc). It is found that with the decrease in mass ratio of C to N, the precipitate is Cr23 C6 phase, σ phase and Cr2 N phase in the as-cast steel in turn. The precipitation of Cr23 C6 and Cr2 N phase increases as the C or N content increases. C and N contents influence the solidification mode of the tested steel and the eutectoid decomposition of the unstable ferrite phase. The solidification mode of 18Mn18Cr0. 44N steel is an AF mode, and the eutectoid decom-position reactions corresponding to the C contents of 0. 025% and 0. 16% are δ→σ + γ2 (0. 025% C) and δ→γ2 + Cr23 (Cx Ny ) 6 (x/ y> 1) (0. 16% C), respectively. The solidification mode of 18Mn18Cr0. 72N steel is an A mode, and a little granular Cr2 N phases precipitate on grain boundaries. Only laminar Cr2 N0. 39 C0. 61 phase exits in the aged steel, and with the increase of C + N content, the volume fraction and lamellar spacing of the precipitates increase, but the incubation time decreases.关键词
奥氏体不锈钢/析出相/显微组织/碳含量/氮含量Key words
austenitic stainless steel/precipitates/microstructure/carbon content/nitrogen content分类
矿业与冶金引用本文复制引用
房菲,李静媛,王一德..18Mn18Cr 高氮钢析出相特征及形成机制[J].北京科技大学学报,2014,(6):768-779,12.
