氩气雾化制备新型镍基高温合金粉末的微观结构和性能  

Microstructure and properties of new nickel-based superalloy powder prepared by argon atomization

作　　者：农必重 张亚洲 刘祖铭[1] 魏冰 曹镔 NONG Bizhong;ZHANG Yazhou;LIU Zuming;WEI Bing;CAO Bin(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2021年第6期547-553,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：中国工程院重点项目(2019-XZ-11);金属材料磨损控制与成型技术国家地方联合工程研究中心开放基金资助项目(HKDNM201907);粉末冶金国家重点实验室自主课题。

摘　　要：采用氩气雾化制备Al、Ti总质量分数小于4%的选区激光熔融用新型镍基高温合金粉末,对粉末的成分、物相组成、形貌、微观结构和性能等进行分析和表征。结果表明,新型镍基高温合金粉末的Al、Ti总质量分数为3.82%。小粒径粉末(粒径<20μm)内部结构致密,以胞状晶组织为主,成分均匀,显微硬度(HV)达到265。随粉末粒径增大,粉末内部树枝晶数量增多,少量大粒径(粒径>40μm)粉末内部出现凝固缩孔和颗粒包覆缺陷。筛分后得到的粒径为15~44μm的粉末,粒径分布集中,中位径DV50为19.7μm,流动性和松装密度分别达到15.14 s/50 g和4.15 g/cm^(3)。New nickel-based superalloy powder for selective laser melting with a total mass fraction of Al and Ti less than 4%was prepared by argon atomization.The composition,phase,morphology,microstructure and properties of the new nickel-based superalloy powder were characterized.The results show that the total mass fraction of Al and Ti in the new nickel-based superalloy powder was 3.82%.Small particle size powder(particle size<20μm)has a compact interior structure,mainly cellular structure,and uniformly composition,and its micro-hardness(HV)reaches 265.As the particle size of the powder increases,the number of dendrites in the powder increases,and solidification shrinkage pore and particle-coating defect appear in some large-diameter(particle size>40μm)powder.After sieving,the powder with a particle size of 15−44μm has a concentrated particle size distribution,a median diameter D_(V50) of 19.7μm,the flow-ability and apparent density are 15.14 s/50 g and 4.15 g/cm^(3),respectively.

关 键 词：氩气雾化 镍基高温合金 微观结构 粉末性能 Al、Ti总含量 

分 类 号：TG146.1[一般工业技术—材料科学与工程]