激光扫描速度对Fe基火焰喷焊重熔层组织和耐磨性的影响  

Influence of Laser Scanning Speed on Microstructure and Wear-resistance of Remelted Coating by Flame Spray-welding with Fe-based Alloy

作　　者：洪永昌[1,2] 杜士青[1,2] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]安徽省高校金属材料与加工重点实验室,安徽马鞍山243002

出　　处：《矿冶工程》2010年第1期77-80,共4页Mining and Metallurgical Engineering

基　　金：安徽省教育厅自然科学研究项目(2005KJ036)

摘　　要：采用金相显微镜、扫描电镜、X射线衍射物相分析和显微硬度、耐磨性测定等试验手段,研究了不同激光扫描速度对Fe基火焰喷焊重熔层组织和耐磨性的影响。试验结果表明,经激光重熔后,火焰喷焊层的组织得到不同程度细化;喷焊重熔层的组织主要由γ-(Fe,Ni)及Fe3Ni2、FeNi3、Cr2B、FeB2Ni3、FeCrB等强化相组成;随着激光扫描速度增加,喷焊重熔层的硬度提高,而且耐磨性均优于原始喷焊层。在相同激光扫描功率下,经200 mm/min激光扫描后,喷焊重熔层耐磨性最好。By means of metallurgical microscope, scanning electric microscope, X-ray diffraction phase analysis, as well as microhardness and wear tests, the influence of laser scanning speed on microstructure and wear-resistance of remehed coating by flame spray-welding with Fe-based alloy was studied. Results show that the microstructure of flame spraywelding coating is obviously refined after being remehed, The mierostructure of remehed coating by spray welding is composed of γ-（Fe, Ni）, FeaNi2, FeNi3, CrEB, FeB2Ni3, FeCrB, etc. The hardness of remelted coating by spray welding was obviously increased and the wear-resistance is also better than that of original spray-welding coatings. It is found, after comparison at the same scan power, the wear-resistance of spray-welding coating is better with the laser scanning speed of 200 mm/min.

关 键 词：激光 扫描速度 表面重熔 FE基合金 组织 耐磨性 

分 类 号：TG156.99[金属学及工艺—热处理]