北京科技大学学报Issue(8)：1052-1059,8.DOI:10.13374/j.issn1001-053x.2014.08.010
合金元素及凝固模式对含氮不锈钢氮含量的影响
Influences of alloying elements and solidification modes on the nitrogen content of nitrogenous stainless steel
摘要
Abstract
The effects of Mn, Cr and Ni on the solidification mode and nitrogen content of as-cast stainless steel were studied by smelting experiments. The key influencing factors on nitrogen content were explored. The coefficients of interaction between alloying el-ements and nitrogen were analyzed in molten steel and solidified steel. The results show that the nitrogen content is determined by both the solubility of nitrogen in molten steel and the solidification mode. When the solubility of nitrogen increases and the solidification mode changes according to the sequence of F→FA→AF→A, the solid solubility of nitrogen in the primary crystal enhances and the emission of nitrogen gas lessens during solidification. With the increase of Mn content, the nitrogen content increases monotonically. However, the nitrogen content varies with the Cr and Ni content in the above processes non-monotonically. The content of Mn does not change the solidification mode which is always FA, and the interaction coefficient is -0.0286, similar to that in molten steel;whereas the increase of Cr and Ni changes the solidification mode according to the routine of F→FA→AF→A and FA→AF→A, respectively, the interaction coefficients between alloying elements and nitrogen in the steel are not a fixed value, ECrN = -0.046 and -0.011, ENiN= -0.011 and 0.033, respectively.关键词
不锈钢/氮含量/凝固/合金元素/相互作用系数/显微组织Key words
stainless steel/nitrogen content/solidification/alloying elements/interaction coefficient/microstructure分类
矿业与冶金引用本文复制引用
房菲,李静媛,王一德..合金元素及凝固模式对含氮不锈钢氮含量的影响[J].北京科技大学学报,2014,(8):1052-1059,8.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）
