热处理对选区激光熔化钴铬合金组织与性能的影响  

Effect of heat treatment on microstructure and properties of selective laser melting Co-Cr Alloy

作　　者：邓煜华 黎振华[1] 姚碧波 滕宝仁 李颢 Deng Yuhua;Li Zhenhua;Yao Bibo;Teng Baoren;Li hao(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650500,China;School of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming Yunnan 650500,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650500 [2]昆明理工大学机电工程学院,云南昆明650500

出　　处：《金属热处理》2023年第1期23-28,共6页Heat Treatment of Metals

基　　金：国家自然科学基金(51961017);云南省基础研究重点项目(202101AS070017);云南省重大专项(202103AN080001-002,202202AG050007-4)。

摘　　要：为明确热处理对选区激光熔化(SLM)钴铬合金成形件组织、性能的影响,利用OM、SEM、XRD、EBSD、EPMA、力学性能和电化学测试研究了激光功率为290 W、扫描速度为950 mm/s下SLM成形的钴铬合金在1150℃保温6 h的热处理前后的微观组织和性能变化。结果表明,钴铬合金成形件经过热处理后,典型熔池形貌消失,可在晶界和晶内观察到明显析出的碳化物,晶粒由粗大的柱状晶转变为细小的等轴晶,耐腐蚀性能降低,硬度变化较小,而伸长率提高约30%。通过热处理可以获得均匀的微观组织,提高γ相的体积分数,提升成形件的塑性,但会降低成形件电化学腐蚀性能。In order to clarify the effect of heat treatment on microstructure and properties of selective laser melting(SLM) cobalt-chromium alloy, the changes of microstructure and properties of the cobalt-chromium alloy SLMed under laser power of 290 W and scanning speed of 950 mm/s before and after heat treatment of heating at 1150 ℃ for 6 h were investigated by means of OM, SEM, XRD, EBSD, EPMA, mechanical properties and electrochemical corrosion test. The results show that after heat treatment, the typical molten pool morphology disappears, and obvious carbide precipitates can be observed in the grain boundaries and intergrains, meanwhile, the grains change from coarse columnar to fine equiaxed grains, the corrosion resistance decreases, the hardness changes little, the elongation increases by about 30%. Finally, through heat treatment, uniform microstructure can be obtained, the volume fraction of γ phase can be increased, and the plasticity can be improved, but the electrochemical corrosion performance is reduced.

关 键 词：选区激光熔化 钴铬合金 热处理 显微组织 电化学腐蚀 力学性能 

分 类 号：TN249[电子电信—物理电子学]