高温超声深滚对镍基碳化钨涂层耐磨性的影响

doi:10.13251/j.issn.0254-6051.2023.12.027

摘要/Abstract

摘要： 为提高等离子喷涂Ni/WC涂层耐磨性,采用高温超声深滚(High temperature ultrasonic deep rolling, HT+UDR)对其进行强化处理。采用附带能谱仪的扫描电镜、X射线衍射仪、维式硬度计和摩擦磨损试验机检测和分析强化处理后Ni/WC涂层的耐磨性。结果表明,经HT+UDR强化后,Ni/WC涂层的层状结构消除,内部孔隙和裂纹减少,涂层更加致密。HT+UDR处理后涂层表层生成Cr₇C₃、Cr₂B₃和CrB等新硬质相,X射线衍射峰半高宽展宽,涂层表层产生晶粒细化,涂层表面硬度提高了185.9 HV0.2。Ni/WC涂层的磨损机理以磨粒磨损为主,伴有疲劳磨损,HT+UDR能有效改善Ni/WC涂层的耐磨性,经HT+UDR处理后,磨损表面的剥落现象和裂纹减少,其磨损量为7.1 mg,相比于未滚压涂层降低51.3%。

关键词: 高温超声深滚, Ni/WC涂层, 耐磨性, 磨损机理

Abstract: High temperature ultrasonic deep rolling (HT+UDR) was applied to plasma sprayed Ni/WC coating to improve its wear resistance. The wear resistance of the Ni/WC coating after HT+UDR was examined and analyzed by using scanning electron microscope with energy spectrometer, X-ray diffractometer, dimensional hardness tester and friction wear tester. The results show that the lamellar structure of the Ni/WC coating after HT+UDR is eliminated, the internal porosity and cracks are reduced and the coating is more compact. After HT+UDR, some new hard phases such as Cr₇C₃, Cr₂B₃ and CrB are generated on the surface layer of the coating, the half-height width of the X-ray diffraction peak is broadened, grain refinement occurs on the surface layer of the coating, and the hardness of the coating surface is increased by 185.9 HV0.2. The wear mechanism of the Ni/WC coating is mainly abrasive wear with fatigue wear, with less spalling and cracking on the worn surface. HT+UDR can effectively improve the wear resistance of the Ni/WC coating, the wear loss is 7.1 mg, which is 51.3% lower compared to that of the unrolled coating.

Key words: high temperature ultrasonic deep rolling (HT+UDR), Ni/WC coating, wear resistance, wear mechanism

中图分类号:

TG174.44

何扬, 林玲, 袁昌望, 钟涛生, 郭文源. 高温超声深滚对镍基碳化钨涂层耐磨性的影响[J]. 金属热处理, 2023, 48(12): 160-165.

He Yang, Lin Ling, Yuan Changwang, Zhong Taosheng, Guo Wenyuan. Effect of high-temperature ultrasonic deep rolling on wear resistance of Ni/WC coating[J]. Heat Treatment of Metals, 2023, 48(12): 160-165.

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