摘要
用45kWCO2激光器在XC38碳钢上激光合金化获得了表面光洁、无氧化和无裂纹缺陷的大面积合金化层。合金化区的微观组织由马氏体、残留奥氏体和多元共晶所组成,其硬度为61～65HRC。保护气体对于激光合金化结果有明显的影响。与氩气和氮气保护比较,氦气保护能产生最好的表面光洁度、最细化的微观组织(二次臂间距SAD,Ar∶N2∶He=1∶1∶06)、最高的冷却速率(Ar∶N2∶He=1∶11∶4)、最高的表面硬度(HV02,Ar∶N2∶He=1∶114∶115)、最多的合金元素溶解率(Ar∶N2∶He=1∶11∶15)。这些结果可以用3种气体的物理特性之间差别来很好解释。
Laser alloying of CSiB+NiMoCo by a 45kW CO 2 laser was investigated to achieve sound large functional layer with smooth surface, little oxidation and free of cracks on cheap and broadly used common carbon steel XC38 The protection gas has obvious influ ence on the alloying results. Compared with Ar and N 2,He results in the best surface smooth, finest microstructure(second dendrite arm Ar∶N 2∶He=1∶1∶0 6),highest cooling rate(Ar∶N 2∶He=1∶1 1∶4),highest average hardness HV0 2(Ar∶N 2∶He=1∶1 14∶1 15),most resolvability of alloying elements(about Ar∶N 2∶He=1∶1 1∶1 5) These results can be properly explained by mainly the difference in physical properties of these three gases
出处
《金属热处理》
CAS
CSCD
北大核心
2000年第1期11-15,共5页
Heat Treatment of Metals
基金
中法政府间教育合作项目
关键词
大面积
激光合金化
激光器
保护气体
微观组织
large area laser alloying
CSiB+NiMoCo alloy layer
large power laser
protection gas
microstructure
