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180210丨PH17-4 不锈钢表面电火花沉积WC–20Ni 涂层及其表征

   日期:2018-02-06     作者:周云龙,盛忠起等    浏览:1537    评论:0    
核心提示:中文核心期刊,中国科技核心期刊! DOI: 10.19289/j.1004-227x.2018.02.010PH17-4 不锈钢表面电火花沉积WC20Ni 涂层及其表征周云
 

中文核心期刊,中国科技核心期刊!


 

DOI: 10.19289/j.1004-227x.2018.02.010

PH17-4 不锈钢表面电火花沉积WC–20Ni 涂层及其表征

 

 

周云龙,盛忠起,周静,张长鹏(东北大学机械工程与自动化学院,辽宁 沈阳 110819)

摘要:以WC–20Ni 作为电极,氩气作为保护气体,通过改装的HB-06 型电火花堆焊修复机在PH17-4 不锈钢基体表面沉积了WC–20Ni 涂层。以涂层厚度为指标,通过单因素试验获得最佳工艺参数为:电压125 V,频率660 Hz,电容120 μF,沉积时间3 min。采用扫描电镜、能谱仪和显微硬度计分别表征了沉积层的表面形貌、成分和显微硬度。在最佳工艺参数下,制得的沉积层组织连续、致密,与基体冶金结合且厚度均匀,约为30 μm。随着距表面距离的增大,沉积层的显微硬度逐渐降低。

关键词:沉淀硬化不锈钢;碳化钨;镍基合金;复合涂层;电火花沉积;表面强化;显微硬度

中图分类号:TG174.4          

文献标志码:A                 

文章编号:1004 – 227X (2018) 02 – 0088 – 05

 

 

 

Electrospark deposition of WC–20Ni coating on PH17-4 stainless steel and its characterization//ZHOU Yun-long,SHENG Zhong-qi*, ZHOU Jing, ZHANG Chang-peng

 

 

 

Abstract:A WC–20Ni coating was deposited on the surface of PH17-4 stainless steel by using a modified Model HB-06 electrospark overlay welding machine with WC–20Ni as electrode under Ar protection. The optimal process parameters were obtained by single-factor experiment with coating thickness as an index as follows: voltage 125 V, frequency 660 Hz, capacitance 120 μF, and deposition time 3 min. The surface morphology, composition, and microhardness of the deposited coating were characterized by scanning electron microscope, energy-dispersive spectrometer, and microhardness tester, respectively. The coating prepared under the optimal conditions is continuous, compact, metallurgically bonded to the substrate, and has a uniform thickness of ca.30 μm. The microhardness is decreased gradually along with the depth from surface in the deposited coating.

Keywords: precipitation-hardening stainless steel; tungsten carbide; nickel-based alloy; composite coating; electrospark deposition; surface hardening; microhardness

First-author’s address:College of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China

 

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