激光功率对AZ91HP镁合金熔凝层组织和性能影响  

Effect of laser power on microstructure and properties of melted layer of AZ91HP magnesium alloy

作　　者：高亚丽[1] 王存山[1] 刘红宾[1] 姚曼[2] 

机构地区：[1]大连理工大学三束材料改性国家重点实验室,辽宁大连116024 [2]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《大连理工大学学报》2007年第4期469-472,共4页Journal of Dalian University of Technology

基　　金：大连理工大学青年教师培养基金资助项目

摘　　要：为提高镁合金表面耐磨蚀性,开展了真空条件下AZ91HP镁合金CO2激光熔凝处理.固定扫描速度下通过改变激光功率,分析讨论了激光功率对熔凝层组织和性能的影响.研究结果表明,随激光功率增加,硬质相β-Mg17Al12含量逐渐增加,熔凝层枝晶逐渐粗化,枝晶变长;由于枝晶细化和硬质相β-Mg17Al12的综合作用,熔凝层在激光功率为3 kW时具有较高的硬度,较好的耐磨性;熔凝层耐蚀性随功率增加而提高.Laser melting treatment of AZ91HP magnesium alloy was carried out under vacuum with a CO2 laser continuous wave in order to improve the wear and corrosion resistance of magnesium alloy. In the case of fixing the scanning speed, the effect of laser power on the microstructure and property of the melted layer was investigated. The results show that with the increasing of laser power, hard phase β-Mg17Al12 of the melted layer increases, and the dendrite of the melted layer is gradually coarse and becomes long. Because of the recombination action of fined dendritic grain and hard phase β-Mg17Al12, the melted layer with the power of 3 kW exhibits higher microhardness, better wear resistance. With the increasing of the power, the corrosion resistance of the melted layer increases.

关 键 词：镁合金 激光功率 微观组织 性能 

分 类 号：TG146[一般工业技术—材料科学与工程]