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

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.