激光扫描速度对球墨铸铁热轧辊表面铁基合金化层组织性能的影响

doi:10.13251/j.issn.0254-6051.2020.05.046

摘要/Abstract

摘要： 采用激光合金化技术在球墨铸铁QT600-3表面制备铁基合金化层,采用扫描电镜(SEM)、X射线衍射(XRD)、Raman光谱仪、显微硬度计和高温摩擦磨损试验等方法研究了不同激光扫描速度对铁基合金化层物相、微观结构、力学性能、常温和高温摩擦学性能的影响。研究结果表明,铁基合金化层与基体冶金结合良好、显微硬度高(高达830 HV0.1)、高温摩擦因数低至0.28、高温磨损率低至2.41×10^-6 g·N^-1·m^-1。合金化层显微组织为奥氏体树枝晶+共晶碳化物,且随着扫描速度增加,组织逐渐细化,合金化层平均厚度减小,裂纹率升高,显微硬度先增加后减小,高温耐磨性能逐渐提高。铁基合金化层的高温磨损机制以磨粒磨损为主,同时还存在着疲劳磨损和氧化磨损。

关键词: 球墨铸铁, 激光合金化, Fe基合金粉末, 扫描速度, 组织, 耐磨性能

Abstract: Fe-based alloyed layers were prepared on the surface of ductile iron QT600-3 by laser alloying technology. The effect of laser scanning speed on the phase composition, microstructure, mechanical properties, tribological properties at high temperature of the alloyed layers were investigated by scanning electron microscope (SEM), X-ray diffraction (XRD), Raman spectrometer, microhardness tester, friction and wear tester. The results show that the Fe-based alloyed layers exhibit good metallurgical bonding to the substrate and high microhardness (up to 830 HV0.1). And the friction coefficient and wear rate at high temperature decrease to 0.28 and 2.41×10^-6 g·N^-1·m^-1, respectively. The microstructures of the Fe-based alloyed layers are mainly composed of γ-phase dendrites and eutectic carbides, and are refined with the scanning speed increasing. With the increase of laser scanning speed, the thickness of the Fe-based alloyed layers decreases and the crack rate increases, while the microhardness increases first and then decreases, and the wear resistance at 700 ℃ increases. In the high temperature friction and wear test, the wear mechanism of the Fe-based alloyed layers is mainly abrasive wear, fatigue wear and oxidation wear.

Key words: ductile iron, laser alloying, Fe-based alloyed layer, scanning speed, microstructure, wear resistance

中图分类号:

TG174.4

王硕煜, 赵毅, 解明祥, 叶文虎. 激光扫描速度对球墨铸铁热轧辊表面铁基合金化层组织性能的影响[J]. 金属热处理, 2020, 45(5): 243-249.

Wang Shuoyu, Zhao Yi, Xie Mingxiang, Ye Wenhu. Effect of laser scanning speed on microstructure and properties of Fe-based alloyed layer on ductile iron hot roller surface[J]. Heat Treatment of Metals, 2020, 45(5): 243-249.

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