激光熔覆工艺参数对TiC_p/Al表层复合材料的影响  

Influence of technological parameters on interface bonding and structure uniformity of in-situ synthesis TiC_p/Al composites in laser cladding process

作　　者：马乃恒[1] 梁工英[1] 苏俊义[1] 

机构地区：[1]西安交通大学机械工程学院,西安710049

出　　处：《中国有色金属学报》2001年第6期1041-1044,共4页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目 ( 5 98710 38);西安交通大学校基金资助项目

摘　　要：研究了激光功率、扫描速度对原位合成TiCp/Al表层复合材料与基底的界面结合和熔覆层组织均匀性的影响。通过调整工艺参数 ,获得了有良好冶金结合的界面和TiC颗粒分布均匀的熔覆组织。结果表明 :在激光功率一定时 ,过低的扫描速度将使激光束前端一定距离内的基底材料在表面熔化前被加热时间太长 ,以致表面氧化 ;而过高的扫描速度会使靠近界面处的粉料中合成反应不能充分完成而残留一些粉末 ;这两种情况都影响了熔覆层和基底的结合。随着激光输入比能的降低 ,熔覆组织的均匀性降低 ,这是由于合成反应未充分完成所致。当激光功率为 2 2 0 0～ 2 5 0 0W ,扫描速度为 7～ 10mm/s时 ,在ZL10 4合金表面可获得组织均匀、界面结合良好的TiCp/Al复合材料熔覆层。The influence of laser power and scanning velocity on interface bonding between clad layer and substrate and uniformity of microstructure in composite surface layer was studied. By means of adjusting these parameters, the excellent interface bonding and uniform microstructure can be obtained. The experiment results show that when the laser power is in a certain value, the lower scanning velocity leads the surface of substrate ahead of laser beam to maintain a longer time at high temperature, so that an oxide film is formed. But, if the scanning velocity is too fast, the synthetic reaction in powder materials near the substrate will be not enough. Either of these two situations will deteriorate the interface bonding. The experiment results also show that the lower the laser input specific energy is, the worse the uniformity of microstructure will be. This phenomenon is caused by insufficient synthetic reaction in powder materials. When the laser power is 2?200～2?500?W, the scanning velocity is 7～10?mm/s, an excellent TiC p/Al composite surface layer can be obtained on ZL104Al alloy.

关 键 词：激光熔覆 原位合成 界面结合 组织均匀性 碳化钛/铝复合材料 

分 类 号：TB333[一般工业技术—材料科学与工程] TG156.99[金属学及工艺—热处理]