表面机械研磨对304不锈钢渗氮组织性能的影响

发布时间：2018-08-29 14:40

【摘要】：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。
[Abstract]:Surface mechanical grinding of 304 stainless steel surface was carried out by (SMAT), and plasma nitriding at different temperatures was carried out. The phase, microstructure and elements of nitriding layer were analyzed by optical microscope and EDS,. The hardness changes after nitriding were detected by microhardness tester, and the corrosion properties of nitriding samples were tested by electrochemical workstation. The results show that after 1800 s of surface mechanical grinding, the nitriding microstructure and properties of the material are the best, and a layer of grain fine layer is formed on the surface of the sample, which can obviously promote the surface mechanical grinding of 304 stainless steel at low temperature nitriding. 1800s. A nitriding layer with a thickness of about 3 渭 m can be obtained by nitriding at 350 鈩，

本文编号：2211515