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.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
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
关键词
镁合金
激光功率
微观组织
性能
magnesium alloy
laser power
microstructure
property
