表面机械研磨对304不锈钢渗氮组织性能的影响Effect of surface mechanical attrition treatment on microstructure and mechanical properties of 304 stainless steel nitriding
王枭,付天琳,张玲,詹肇麟,于晓华,吴云霞,刘忠
摘要(Abstract):
对304不锈钢表面进行表面机械研磨处理(SMAT),再进行不同温度下的低温等离子渗氮。利用光学显微镜、XRD、SEM和EDS,分析渗氮层的物相、显微组织和元素;采用显微硬度计检测渗氮后硬度的变化;采用电化学工作站测试渗氮后试样的腐蚀性能。结果表明,经过1800 s的表面机械研磨处理,材料的渗氮组织性能达到最好,样品表面生成一层晶粒细化层,可以明显促进304不锈钢的低温渗氮。1800 s的表面机械研磨处理后,在350℃下进行渗氮,可以获得一层厚度约3μm的渗氮层,其硬度高达925 HV0.05。和未处理的试样对比,自腐蚀电位升高了0.2 V,自腐蚀电流降低了4.22×10-4A·cm-2。
关键词(KeyWords): 表面机械研磨;304不锈钢;等离子渗氮
基金项目(Foundation): 国家自然科学基金(51165016)
作者(Author): 王枭,付天琳,张玲,詹肇麟,于晓华,吴云霞,刘忠
DOI: 10.13289/j.issn.1009-6264.2015.s1.035
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