四种先进超超临界机组候选镍基高温合金的平衡相析出行为研究  

Study on Equilibrium Phase Precipitation Behavior of Four Advanced Ultra-Supercritical Unit Alternative Nickel-Based Superalloys

作　　者：陈震宇 朱忠亮[1] 刘聚 陈张杨 张乃强[1] CHEN Zhenyu;ZHU Zhongliang;LIU Ju;CHEN Zhangyang;ZHANG Naiqiang(National Thermal Power Engineering&Technology Research Center,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学国家火力发电工程技术研究中心,北京102206

出　　处：《锅炉技术》2024年第5期52-59,共8页Boiler Technology

基　　金：国家自然科学基金项目(52006067);国家重点研发计划(2022YFB4100403)。

摘　　要：利用Thermo-Calc软件研究了4种先进超超临界机组候选镍基高温合金Inconel617、C-HRA-2、Inconel740和C-HRA-1的平衡相析出规律,计算了4种合金的高温相图,分析了主要析出相的析出行为,最后将计算结果同实验对比以验证准确性.结果表明:4种合金主要的析出相包括γ、γ’、σ、η及碳化物等;γ’、σ和η相的平衡析出量随着温度的降低而增大;4种合金具有不同的碳化物类型、含量及析出范围,Inconel617和C-HRA-2的碳化物为M_(23)C_(6)型(一次)与M_(6)C型(二次),Inconel740和C-HRA-1的碳化物为MC型(一次)与M_(23)C_(6)型(二次),硼化物为C-HRA-2所特有.热力学平衡计算结果与实验检测基本一致.掌握合金中主要析出相的热力学计算结果对了解合金的高温长时组织和性能稳定性具有重要作用.The equilibrium phase precipitation patterns of four advanced ultra-supercritical unit Alternative nickel-based superalloys Inconel 617,C-HRA-2,Inconel 740 and C-HRA-1 were studied using Thermo-Calc Software.The high-temperature phase diagrams of the four alloys were calculated,and the precipitation behavior of the main precipitated phases was analyzed.Finally,the calculation result was compared with the experiment to verify accuracy.The results indicate that the main precipitates of the four alloys includeγ,γ',σ,δand carbides,etc.The equilibrium precipitation amount ofγ',σandδphases increases with the decrease of temperature.The four alloys have different types,contents,and precipitation ranges of carbides.The carbides of Inconel 617 and C-HRA-2 are M_(23)C_(6)(primary)and M_(6)C(secondary),while the carbides of Inconel 740 and C-HRA-1 are MC(primary)and M_(23)C_(6)(secondary).Borides are unique to C-HRA-2.The thermodynamic equilibrium calculation results are basically consistent with the experimental detection.Mastering the thermodynamic calculation results of the main precipitates in alloys plays an important role in understanding their high-temperature long-term microstructure and performance stability.

关 键 词：镍基合金 析出相 热力学 先进超超临界 

分 类 号：TK225[动力工程及工程热物理—动力机械及工程]