电子束熔炼新型Ni-Co基高温合金过程中合金元素的挥发行为及熔池温度计算  

Evaporation Behavior of Alloying Elements and Calculation of Molten Pool Temperature in Electron Beam Smelting of a New Ni-Co Based Superalloy

作　　者：王以霖 谭毅[1,2] 崔传勇 游小刚[1,2] 赵龙海[1,2] 崔弘阳 李鹏廷 李晓娜 WANG Yilin;TAN Yi;CUI Chuanyong;YOU Xiaogang;ZHAO Longhai;CUI Hongyang;LI Pengting;LI Xiaona(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;Key Laboratory for Energy Beam Metallurgy and Advanced Materials Preparation of Liaoning Province,Dalian 116024,Liaoning,China;Superalloys Division,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Key Laboratory of Material Modification by Laser,Ion and Electron Beam Ministry of Education,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]辽宁省载能束冶金及先进材料制备重点实验室,辽宁大连116024 [3]中国科学院金属研究所高温合金部,沈阳110016 [4]大连理工大学三束材料改性教育部重点实验室,辽宁大连116024

出　　处：《材料导报》2023年第1期172-177,共6页Materials Reports

基　　金：国家重点研发计划(2019YFA0705300);国家自然科学基金(52004051);大连市重点领域创新团队(2019RT13)。

摘　　要：本工作采用电子束熔炼方法制备了新型Ni-Co基高温合金,对熔炼后铸锭的显微组织、成分、合金元素挥发行为以及熔池表面温度分布进行了研究。结果表明,随着熔炼功率的增加,铸锭的显微组织越来越细,质量损失越来越大。熔炼后Cr和Al的质量分数下降,其余元素质量分数上升。在相同温度下,纯元素Al的饱和蒸气压最大,W的饱和蒸汽压最小。将熔体系统简化为Ni-Cr-Co三元合金模型来研究其挥发行为,合金元素的活度系数和活度可采用Miedema模型预测,Ti、Mo、W元素的理论挥发速率很小,挥发损失基本可以忽略不计。Al元素的挥发速率通过引入活度系数补偿因子计算。熔炼功率为10 kW、12 kW、14 kW时熔池的平均温度分别为1863.6 K、1890.6 K和1904.3 K,对应的熔池最高温度分别为2368.1 K、2402.4 K、2419.8 K。A new Ni-Co based superalloy was prepared by electron beam smelting.The microstructure,composition,volatilization behavior of alloy elements and temperature distribution of molten pool surface were studied.The results show that with the increase of melting power,the microstructure of ingot is finer and the mass loss is larger.After smelting,the mass fractions of Cr and Al decrease,and the mass fraction of the remaining elements increase.At the same temperature,the saturated vapor pressure of pure Al element is the highest and that of W is the lowest.The melt system was simplified to a Ni-Cr-Co ternary alloy model to study its volatilization behavior.The activity coefficients and activities of alloying elements can be predicted by Miedema model.The theoretical volatilization rates of Ti,Mo and W elements are very small,and the volatilization loss can be ignored basically.The volatilization rate of Al element was calculated by introducing activity coefficient compensation factor.The ave-rage temperature of the molten pool with the melting power of 10 kW,12 kW and 14 kW is 1863.6 K,1890.6 K and 1904.3 K respectively,and the corresponding maximum temperature of the molten pool is 2368.1 K,2402.4 K and 2419.8 K.

关 键 词：高温合金 电子束熔炼 元素挥发 温度分布 

分 类 号：TF134[冶金工程—冶金物理化学]