304不锈钢纳米晶粒表层液体氮碳共渗后的结构和力学性能  

Structure and mechanical properties of liquid nitrocarburized 304 stainless steel with a nanocrystalline surface layer

作　　者：周益敏[1] 赵程[2] 曾群锋[3] 樊明涛[1] 罗厚杉[2] 付涛[1] 

机构地区：[1]西安交通大学生物医学信息工程教育部重点实验室,陕西西安710049 [2]青岛科技大学等离子体表面技术研究所,山东青岛266061 [3]西安交通大学现代设计及转子轴承系统教育部重点实验室,陕西西安710049

出　　处：《金属热处理》2012年第10期39-43,共5页Heat Treatment of Metals

基　　金：陕西省科技计划项目(2007K06-08);国家自然科学基金(50901058)

摘　　要：采用表面机械研磨处理(SMAT)在304不锈钢表面形成纳米晶粒表层,对粗晶粒和表面纳米化的304不锈钢试样采用一种较为环保的新型介质在450℃进行氮碳共渗(分别标记为CG-NC和SNC-NC试样)。结果表明,氮碳共渗的两种试样表面光滑,表层主要由含氮的S相组成,但SNC-NC试样仍保留纳米晶粒的表面结构。SNC-NC试样的氮原子扩散深度(13.3μm)、硬度(1040 HV0.05)和耐磨性都高于CG-NC试样(8.2μm,780 HV0.05)。A nanocrystalline surface layer was generated on 304 stainless steel by the surface mechanical attrition treatment （SMAT） technique. The coarse grained and the surface nanocrystallized 304 stainless steel samples were salt bath nitrocarburized by using a newly developed environment friendly salt medium at 450 ℃ （noted as CG-NC and SNC-NC samples, respectively）. The results show that the both treated samples have smooth surface, and the surface layers are mainly composed of N containing S phase, but SNC-NC sample still maintains nano-sized grains at the surface layer. The SNC-NC sample has larger N diffusion depth （13.3 μm）, higher hardness （ 1040 HV0. 05） and better wear resistance than the CG-NC sample （8. 2 μm, 780 HV0.05）.

关 键 词：304不锈钢 表面纳米化 液体氮碳共渗 耐磨性 

分 类 号：TG156.8[金属学及工艺—热处理]