摘要
为了改善40Cr钢的表面状态,拓展其应用范围,采用CO2激光器及LASERCELL-1005六轴六联动三维激光加工机床在40Cr钢表面多道搭接激光熔覆了N iCrBSi合金粉末,利用扫描电镜、金相显微镜、磨损试验机、盐雾试验机等对熔覆层的组织及性能进行了研究。结果表明:激光熔覆层由熔覆区、结合区和热影响区3部分组成。多道搭接激光熔覆层易产生裂纹,裂纹呈主裂纹带有少量分枝状,且几乎穿透整个熔覆层。激光熔覆层的耐磨性和耐蚀性随扫描速度的增加均呈现先升高后降低的趋势。搭接处的相对耐磨性、耐蚀性均不及非搭接处,这与搭接过程的重复扫描有关。
Multitraek overlapped laser cladding NiCrBSi alloy coating was prepared on 40Cr steel surface using a CO2 laser and a LASERCELL-1005 six-axis synchronal three-dimensional laser processing machine tool.The microstructure and properties of the laser cladding coating were analyzed using a scanning electron microscope,a metallographic microscope,a friction and wear tester and a salt spray test rig.Results indicate that as-prepared laser cladding coating can be divided into three zones(cladding zone,bonding zone and thermally affected zone).The multitrack overlapped laser cladding coating was liable to generate cracks,which consisted of major cracks and a small amount of branch cracks,and almost penetrated through the cladding layer.Besides,with the increase of scanning speed,beth the wear resistance and corrosion resistance of the laser cladding coating initially rose and then declined.Moreover,possibly due to repeated scanning in the overlapping process,wear resistance and corrosion resistance were relatively poorer at the overlapped area than those at the non-overlapped area.
出处
《材料保护》
CAS
CSCD
北大核心
2011年第6期62-64,1,共3页
Materials Protection
关键词
激光熔覆
多道搭接
NICRBSI合金
微观组织
耐磨性
耐蚀性
laser cladding
multitrack overlapping
NiCrBSi alloy
microstrncture
wear resistance
corrosion resistance