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  

Effect of laser scanning speed on microstructure and properties of Fe-based alloyed layer on ductile iron hot roller surface

作　　者：王硕煜 赵毅 解明祥 叶文虎 Wang Shuoyu;Zhao Yi;Xie Mingxiang;Ye Wenhu(Anhui Ma Steel Surface Engineering Technology Co.,Ltd.,Maanshan Anhui 243021,China;School of Materials Science and Engineering,Anhui University of Technology,Maanshan Anhui 243032,China)

机构地区：[1]安徽马钢表面技术股份有限公司,安徽马鞍山243021 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243032

出　　处：《金属热处理》2020年第5期243-249,共7页Heat Treatment of Metals

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^-6g·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。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.

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 

分 类 号：TG174.4[金属学及工艺—金属表面处理]