1473K,0.1MPa氮气氛中Fe-Cr-Mn系不锈钢的固态渗氮  

Solid State Nitriding of Fe-Cr-Mn Stainless Steel in 0.1 MPa Nitrogen Atmosphere at 1473K

作　　者：李光强[1] 张峰[1] 朱诚意[1] 

机构地区：[1]武汉科技大学材料与冶金学院

出　　处：《武汉科技大学学报》2005年第2期115-118,共4页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金和上海宝钢集团公司联合资助项目(50374053)

摘　　要：对0.1MPa氮气氛中Fe-Cr-Mn系不锈钢的固态渗氮进行了实验研究。结果表明,渗氮过程钢中氮的平均质量分数与渗氮时间的平方根成正比,渗氮反应平衡时间受钢的化学成分影响;渗氮反应达到平衡后,钢中氮的平均质量分数与其成分的关系可用线性关系近似表示为:w[N]eq=0.066w[Cr]+0.029w[Mn]-0.608;向0.1MPa氮气氛中添加0.5%的氢气可以显著提高渗氮速率。在本实验条件下,Cr,Mn质量分数之和大于20%的Fe-Cr-Mn系不锈钢在1473K,0.1MPa氮气氛中渗氮12.5h后,可以得到含氮量大于0.5%的高氮奥氏体不锈钢。Solid state nitriding of Fe-Cr-Mn stainless steel in 0.1 MPa nitrogen atmosphere at 1473 K has been investigated. The results show that the average nitrogen contents in those solid state steel samples are proportional to the square root of nitriding time during solid state nitriding. The nitriding time needed is influenced by the chemical composition of steel. The saturated nitrogen content can be described as w_\eq=0.066w_\+0.029 w_\-0.608. The nitrogen absorption rate can be markedly improved by adding 0.5% H_2 gas into nitrogen. It is also found that the average nitrogen content has exceeded 0.5% after solid state nitriding for 12.5 h in 0.1MPa nitrogen atmosphere at 1473 K,with the mass percent of w_\+w_\≥20%and austenite single phase obtained.

关 键 词：氮 溶解度 高氮钢 固态渗氮 

分 类 号：TG111.6[金属学及工艺—物理冶金]