双电源低温渗氮工艺在316不锈钢上的应用

doi:10.13251/j.issn.0254-6051.2022.03.002

金属热处理 ›› 2022, Vol. 47 ›› Issue (3): 7-13.DOI: 10.13251/j.issn.0254-6051.2022.03.002

双电源低温渗氮工艺在316不锈钢上的应用

罗建东¹, 胡雁鸿¹, 林育周²

1.华南理工大学机械与汽车工程学院, 广东广州 510000;
2.深圳市华宇发真空离子技术有限公司, 广东深圳 518000

收稿日期:2021-10-18 修回日期:2021-12-27 出版日期:2022-03-25 发布日期:2022-04-22
作者简介:罗建东(1967—),男,高级工程师,博士,主要研究方向为金属材料失效、强化及表面处理, E-mail: jdluo@scut.edu.cn
基金资助:
华南理工大学科研基金(X2JQ-D8170170)

Application of low temperature nitriding process with double power supplies on 316 stainless steel

Luo Jiandong¹, Hu Yanhong¹, Lin Yuzhou²

1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou Guangdong 510000, China;
2. Shenzhen Huayufa Vacuum Ion Technology Co., Ltd., Shenzhen Guangdong 518000, China

Received:2021-10-18 Revised:2021-12-27 Online:2022-03-25 Published:2022-04-22

摘要/Abstract

摘要： 通过正交试验研究了交流脉冲电压、直流脉冲偏压和温度对316不锈钢表面硬度和渗层厚度的影响,获得了双电源低温渗氮最佳工艺参数。通过光学显微镜(OM)、X射线衍射仪(XRD)、显微硬度计、电化学工作站以及摩擦磨损试验机等研究了最佳工艺下渗氮试样的性能。结果表明,影响渗氮试样性能因素的顺序为:交流脉冲电压＞温度＞直流脉冲偏压。最佳工艺参数为交流脉冲电压360 V,直流脉冲偏压270 V,温度380 ℃。对最佳工艺制备的试样与单电源进行对比:渗层厚度为43.4 μm,是单电源的8.5倍;表面硬度为1350 HV0.025,是单电源的3.1倍;自腐蚀电位由－256 mV(vs SCE,下同)提高到－180 mV;自腐蚀电流密度从13.90 μA/cm² 降低到0.45 μA/cm²;摩擦因数从0.55降低到0.42。双电源渗氮速率的提高是由于高能离子轰击引起的表面结构缺陷和渗氮气体的高度离解。

关键词: 316不锈钢, 低温离子渗氮, 双电源, 高渗速, 耐磨, 耐蚀

Abstract: Effects of AC pulse voltage, DC pulse bias voltage and temperature on surface hardness and nitrided layer thickness of 316 stainless steel were studied by orthogonal test, and the optimal process parameters of double power supplies for low temperature nitriding were obtained. The properties of the nitrided specimens treated by optimal process were evaluated by means of optical microscope (OM), X-ray diffraction (XRD), microhardness tester, electrochemical workstation and friction and wear tester. The results show that the order of factors affecting properties of the nitrided specimens is: AC pulse voltage＞temperature＞DC pulse bias voltage. The optimum process parameters are AC pulse voltage of 360 V, DC pulse bias voltage of 270 V, and temperature of 380 ℃. Compared with single power supply, the thickness of nitrided layer treated by double power supplies is 43.4 μm, which is 8.5 times of single power supply; the surface hardness is 1350 HV0.025, which is 3.1 times of single power supply; the self-corrosion potential increases from -256 mV(vs SCE) to -180 mV(vs SCE), and the self-corrosion current density decreases from 13.90 μA/cm² to 0.45 μA/cm²; the friction coefficient is reduced from 0.55 to 0.42. The increase of nitriding rate of double power supplies is due to the surface structure defects caused by high energy ion bombardment and the high dissociation of nitriding gas.

Key words: 316 stainless steel, low temperature ion nitriding, double power supplies, high nitriding rate, wear resistance, corrosion resistance

中图分类号:

TG174.44

罗建东, 胡雁鸿, 林育周. 双电源低温渗氮工艺在316不锈钢上的应用[J]. 金属热处理, 2022, 47(3): 7-13.

Luo Jiandong, Hu Yanhong, Lin Yuzhou. Application of low temperature nitriding process with double power supplies on 316 stainless steel[J]. Heat Treatment of Metals, 2022, 47(3): 7-13.

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双电源低温渗氮工艺在316不锈钢上的应用

Application of low temperature nitriding process with double power supplies on 316 stainless steel

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