抽拉速率对一种第三代镍基单晶高温合金微观组织和偏析的影响  

Effect of Withdrawal Rate on Microstructure and Segregation of a Third-Generation Nickel-Base Single Crystal Superalloy

作　　者：李俊杰 玄伟东[1,2,3] 程凯旋 王鑫奕 吕圣炜 张翔宇 任忠鸣 LI Junjie;XUAN Weidong;CHENG Kaixuan;WANG Xinyi;LYU Shengwei;ZHANG Xiangyu;REN Zhongming(State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China;Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai 200444,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海市钢铁冶金新技术开发应用重点实验室,上海200444 [3]上海大学材料科学与工程学院,上海200444

出　　处：《上海金属》2024年第5期33-40,共8页Shanghai Metals

基　　金：国家自然科学基金(52274386,92060104)。

摘　　要：采用不同抽拉速率制备了一种第三代镍基单晶高温合金,研究了抽拉速率对合金微观组织和元素偏析的影响。结果表明:随着抽拉速率的增加,一次枝晶臂间距和二次枝晶臂间距减小;孔隙率先增大再减小,γ′相的尺寸和体积分数均减小且立方度增加;负偏析元素Re、W的偏析程度减小,正偏析元素Al的偏析程度变化较小,Ta的偏析程度略微增大。A third-generation nickel-base single crystal superalloy was prepared with different withdrawal rates,and the effects of withdrawal rates on the microstructure and elements segregation of the alloy were studied.The results showed that with the increase of withdrawal rate,the primary and secondary dendrite arm spacing decreased,and the porosity increased at first and then decreased.The size and the volume fraction of theγ'phase decreased,while the cubic degree increased.The degree of segregation of the negative segregation elements Re and W decreased,while the degree of segregation of the positive segregation elements Al changed slightly and that of Ta increased slightly.

关 键 词：镍基单晶高温合金 抽拉速率 显微缩孔 偏析 

分 类 号：TG132.3[一般工业技术—材料科学与工程]