氮含量对超细晶奥氏体不锈钢组织和性能的影响  

Effects of Nitrogen on Microstructure and Properties of Ultra-fine Grain Austenitic Stainless Steel

作　　者：鲁修宇[1] 王贞[2] 蒋跃东[1] 帅习元[1] 刘静[2] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《热加工工艺》2014年第6期72-75,共4页Hot Working Technology

摘　　要：通过机械合金化和放电等离子烧结技术制备超细晶奥氏体不锈钢,分析其组织与性能,研究了氮含量对该不锈钢组织和性能的影响。结果表明,随氮含量的增加,烧结试样中马氏体越来越少。氮具有稳定奥氏体的作用,当氮含量为1.2%时,试样基体转化为单一奥氏体相。制得试样晶粒均细小且均匀,尺寸都达到纳米级,氮含量为1.2%的试样,晶粒尺寸最小,只有100 nm。表明采用机械合金化方法结合等离子烧结技术成功制备了纳米级奥氏体不锈钢。氮的加入还能显著提高奥氏体不锈钢的硬度、耐磨性和抗拉强度。The ultra-fine high nitrogen austenite stainless steel was prepared by mechanical alloy （MA） and spark Plasma sintering（SPS） technology. The microstructure and properties of the sintered samples were tested, and the influence of nitrogen content on the microstructure and properties of the steel was analyzed. The results show as follows：with the increase of nitrogen content, the martensite in the sintered specimen is less. The nitrogen has the function to stable austenite, when the nitrogen content reaches 1.2%, there is only the austenific phase. The grain size of the matrix is maintained to be fine and homogeneous. The grain size of the sample with 1.2%N is smallest, only about 100 nm in diameter. It＇s shown that the mechanical alloy method along with spark plasma sintering technology is a feasible method for the fabrication of nanometer level ultm-hne austenite stainless steel. The addition of nitrogen can obviously enhance the hardness, wear-resistant and compression strength of the steel.

关 键 词：高氮奥氏体不锈钢 机械合金化 放电等离子烧结 超细晶 

分 类 号：TG142.1[一般工业技术—材料科学与工程]