Ta、Co对新型高强抗热腐蚀镍基单晶高温合金组织稳定性的影响  

Effects of Ta and Co on Microstructural Stability of Novel High Strength and Hot-Corrosion Resistant Nickel Based Single Crystal Superalloys

作　　者：来永军 宁礼奎[1] 赵岭 柳一川 刘恩泽[1] 谭政[1,2] 李海英 佟健 郑志[1] Lai Yongjun;Ning Likui;Zhao Ling;Liu Yichuan;Liu Enze;Tan Zheng;Li Haiying;Tong Jian;Zheng Zhi(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Shenyang Research Institute of Foundry Co.,Ltd,CAM,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]中国科学技术大学材料科学与工程学院,辽宁沈阳110016 [3]中国机械总院集团沈阳铸造研究所有限公司,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2024年第3期748-756,共9页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2021YFC2202402);辽宁省科技攻关计划(2019JH2/10100009)。

摘　　要：研究了Ta、Co对一种新型高强抗热腐蚀单晶高温合金微观组织及1000℃长期时效中组织稳定性的影响。结果表明,随Ta含量的增加,γ′相溶解温度提高,完全热处理后的γ′相尺寸先增大后减小,Co降低了γ′相溶解温度,减小了γ′相尺寸并且降低了γ′相的含量;1000℃长期时效过程中,随Ta含量的提高,γ′相粗化速率先降低后升高,Co降低了γ′相的粗化速率,γ/γ′两相错配度和元素的扩散是影响γ′相粗化速率的主要因素;Ta提高了合金中γ′相的含量,促使Re、W、Mo、Cr元素向γ基体中分配,促进了tcp相的析出,Co降低了Re、W、Mo、Cr元素在γ基体中的分配,降低了基体的过饱和度,抑制了tcp相的析出。The microstructure of hot-corrosion resistant single crystal superalloy with different Ta and Co contents and the microstructure stability during long-term aging at 1000℃was investigated.The results show that in the single crystal superalloy of the experiment,the dissolution temperature ofγ'phase increases with the increase in Ta content,the size ofγ'phase first increases and then decreases after complete heat treatment.The dissolution temperature ofγ'phase decreases and the size ofγ'phase and the content ofγ'phase reduce with the increase in Co content.During the long-term aging process at 1000℃,the coarsening rate ofγ'phase first decreases and then increases with the increase in Ta content,while the coarsening rate ofγ'phase decreases with the increase in Co content.The mismatch degree ofγ/γ'phase and the diffusion of elements in matrix are the main factors affecting the coarsening rate ofγ'phase in the four alloys.In addition,Ta increases the content ofγ'phase,promotes the distribution of Re,W,Mo and Cr towardγmatrix,and promotes the precipitation of tcp phase,while Co reduces the distribution of Re,W,Mo and Cr inγmatrix,reduces the supersaturation of matrix and inhibits the precipitation of tcp phase.

关 键 词：TA CO 抗热腐蚀 单晶高温合金 组织稳定性 

分 类 号：TG132.32[一般工业技术—材料科学与工程]