新型低钴铸造镍基高温合金的相析出行为  

Phase Precipitation Behavior of New Low-Co Casting Nickel-Based Superalloy

作　　者：胡亮 王珏[1,2] 巨佳 王章忠[1,2] 潘斌 Hu Liang;Wang Jue;Ju Jia;Wang Zhangzhong;Pan Bin(School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing 211167,China;Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,Nanjing 211167,China;Jiangyin Uni-Pol Co.,Ltd,Wuxi 214426,China)

机构地区：[1]南京工程学院材料科学与工程学院,江苏南京211167 [2]江苏省先进结构材料与应用技术重点实验室,江苏南京211167 [3]江阴鑫宝利金属制品有限公司,江苏无锡214426

出　　处：《稀有金属材料与工程》2022年第11期4219-4226,共8页Rare Metal Materials and Engineering

基　　金：江苏省产业前瞻与关键核心技术竞争项目(BE2019027);江苏省研究生科研与实践创新计划(SJCX20_0697);南京工程学院校级科研基金(CKJA201802,JCYJ201811)。

摘　　要：利用热力学计算软件JMatPro和差示扫描量热实验,研究新型低钴铸造镍基高温合金的相析出行为,并与实际铸锭的组织、成分进行对比。结果表明,低钴合金铸态组织主要包括γ(基体)、γ′、碳化物(MC、M6C)和γ+γ′共晶组织(体积分数约13.9%),凝固过程中Ta和Hf出现正偏析。DSC测试得出合金初熔点、终熔点和γ′相回溶温度分别为1300.1、1349.6和1272.1℃,理论计算与实验结果基本一致。热力学计算显示Al、W含量增加能够分别提高γ′和M6C型碳化物的析出量与回溶温度,Hf、Ta元素能增大MC型碳化物的液析倾向,新型低钴合金的预期持久性能优于现有商用镍基多晶铸造高温合金。The phase precipitation behavior of a new low-cobalt casting nickel-based superalloy was studied by thermodynamic calculation software JMatPro and differential scanning calorimetry(DSC),and the microstructure and composition of the superalloy were compared with the actual ingot.The results show that the as-cast microstructure of low-cobalt alloy mainly includesγ(matrix),γ′,carbides(MC,M6C)andγ+γ′eutectic structure(volume fraction about 13.9%).Positive segregation of Ta and Hf occurs during solidification.The DSC test shows that the initial melting point,final melting point andγ′phase remelting temperature of the alloy are 1300.1,1349.6 and 1272.1℃,respectively.Theoretical calculations are basically consistent with the experimental results.Thermodynamic calculation s hows that the increase of Al and W content can increase the precipitation amount and resolubilization temperature ofγ′and M6C carbides,respectively.Hf and Ta elements may increase the liquid-precipitation tendency of MC carbides.The expected stress rupture property of the new low-cobalt alloys is better than that of existing commercial nickel-based polycrystalline casting superalloys.

关 键 词：热力学计算 低钴高温合金 相析出行为 持久性能 

分 类 号：TG146.15[一般工业技术—材料科学与工程]