| 引用本文: | 王引真,冯雅,孙永兴,冯涛.表面纳米化与离子渗氮对304不锈钢的影响[J].材料科学与工艺,2019,27(1):59-64.DOI:10.11951/j.issn.1005-0299.20170300. |
| WANG Yinzhen,FENG Ya,SUN Yongxing,FENG Tao.Effect of surface nanocrystallization and plasma nitriding parameters on 304 stainless steel[J].Materials Science and Technology,2019,27(1):59-64.DOI:10.11951/j.issn.1005-0299.20170300. |
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| 摘要: |
| 为解决304不锈钢硬度低、耐磨性差的问题，本文采用预先表面纳米化，温度400、450 ℃，保温时间4、6 h, 氮氢比1:3的离子渗氮工艺对试样进行处理，研究纳米化以及渗氮工艺对304不锈钢渗氮层形貌和深度、硬度以及摩擦磨损性能的影响.利用金相显微镜、电子探针显微分析仪(EPMA)、能谱仪(EDS)、显微硬度计和磨损试验机对样品的显微组织、微观形貌、硬度及耐磨性进行了表征.结果表明：304不锈钢经表面纳米化与离子渗氮工艺处理后，渗氮层为0.1~0.2 mm，表面硬度约为1 200 HV0.1，比基体硬度提高了6~7倍，耐磨性也大大增强；但渗氮温度越高，保温时间越长，材料表面耐磨性越差.综合各种影响因素得出在本实验条件下最佳处理工艺为：预先表面纳米化，渗氮温度400 ℃、保温时间6 h. |
| 关键词: 304不锈钢 表面纳米化 离子渗氮 硬度 耐磨性 |
| DOI：10.11951/j.issn.1005-0299.20170300 |
| 分类号:TG156.8 |
| 文献标识码:A |
| 基金项目:山东省科技计划项目(2014GGX103013). |
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| Effect of surface nanocrystallization and plasma nitriding parameters on 304 stainless steel |
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WANG Yinzhen, FENG Ya, SUN Yongxing, FENG Tao
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(School of Materials Science and Engineering, China University of Petroleum, Qingdao 266580, China)
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| Abstract: |
| To solve the problem of low hardness and poor wear resistance of 304 stainless steel, this research applied the surface nanocrystallization mechanism and treated the sample by plasma nitriding at 400 ℃and 450 ℃ with holding time 4 h and 6 h and nitrogen and hydrogen ratio of 1:3. Influence of the nanocrystallization and nitriding process on the morphology, depth, hardness, and friction, and wear properties of nitrided layer of 304 stainless steel was studied. The microstructure, micro morphology, hardness, and wear resistance of the sample were measured and characterized by using metallographic microscope, EPMA, EDS, micro-hardness tester, and wear testing machine. Results show that after being treated by surface nanocrystallization and plasma nitriding composite process, the nitrided layer of 304 stainless steel was about 0.1~0.2 mm, the microhardness values reached 1 200 HV0.1, which is 6~7 times higher than that of the matrix, and the wear resistance was greatly improved. However, the higher the nitriding temperature was, the longer the holding time was, and the worse the wear resistance of the material surface became. Considering multiple factors, the optimum treatment process was obtained under the experimental condition when the nitriding temperature is 400 ℃ and the holding time is 6 h after surface nanocrystallization. |
| Key words: 304 stainless steel surface nanocrystallization plasma nitriding hardness wear resistance |
