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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 ultrafine-grained austenitic stainless steel was prepared by mechanical alloying and spark plasma sintering. The microstructure and properties of the ultrafine-grained austenitic stainless steel were analyzed. The effect of nitrogen content on the microstructure and properties of the stainless steel was investigated. The results show that with the increase of nitrogen content, the martensite in sintered samples is less and less. Nitrogen has the effect of stabilizing austenite. When the nitrogen content is 1.2%, the sample matrix is transformed into a single austenite phase. The prepared samples were fine and uniform, the size of which reached nanometer and the nitrogen content was 1.2%. The grain size was the smallest, only 100 nm. It shows that the nanosized austenitic stainless steel has been successfully prepared by mechanical alloying method and plasma sintering technology. Nitrogen addition can significantly improve the hardness, wear resistance and tensile strength of austenitic stainless steel.