摘要
利用光学显微镜和扫描电镜观察新型Ni-Co基高温合金的铸态组织,采用JMatPro软件在平衡和非平衡凝固条件下对该合金进行热力学计算,研究了合金的相析出特点。结果表明:试验合金呈现枝晶形貌,偏析严重,主要组织为γ'相、η相、γ/γ'共晶组织以及MC碳化物。平衡凝固条件下,试验合金的主要析出相为γ'、η、μ、σ、碳化物以及硼化物;钛和铝含量增加导致γ'相析出量增加,析出温度升高;η相析出温度和析出量随钛含量增加呈线性增加。在非平衡凝固过程中,钛、钼元素富集在液相中,而铝、铬、钴和钨元素在液相中贫乏。
The as-cast microstructure of a new Ni-Co-based superalloy was observed by optical microscopy and scanning electron microscopy.The thermodynamic calculation of the alloy was carried out by JMatPro software under equilibrium and non-equilibrium solidification conditions to study the phase precipitation characteristics.The results show that the test alloy exhibited dendritic morphology and severe segregation,and mainly consisted ofγ'phase,ηphase,γ/γ'eutectic structure and MC carbides.Under equilibrium solidification conditions,the main precipitation phases of the test alloy wereγ',η,μ,σ,carbides and borides.Increasing Ti and Al content led to an increase inγ'phase precipitation amount and precipitation temperature.The precipitation temperature and amount ofηphase increased linearly with increasing Ti content.In the non-equilibrium solidification process,Ti and Mo elements were enriched in the liquid phase,while Al,Cr,Co and W elements were poor in the liquid phase.
作者
庄辛鹏
谭毅
赵龙海
崔传勇
崔弘阳
游小刚
李鹏廷
ZHUANG Xinpeng;TAN Yi;ZHAO Longhai;CUI Chuanyong;CUI Hongyang;YOU Xiaogang;LI Pengting(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;Key Laboratory for Energy Beam Metallurgy and Advanced Materials Preparation of Liaoning Province,Dalian University of Technology,Dalian 116024,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2023年第1期111-118,共8页
Materials For Mechanical Engineering
基金
国家重点研发计划项目(2019YFA0705300)
国家自然科学基金资助项目(91860123,52004051)
大连市重点领域创新团队支持计划项目(2019RT13)。
关键词
新型Ni-Co基高温合金
热力学计算
平衡析出相
析出温度
new Ni-Co-based superalloy
thermodynamic calculation
equilibrium precipitation phase
precipitation temperature
