K439B铸造高温合金双态型γ′相长期时效粗化行为研究  

Coarsening Behavior of Bimodalγ′Phase in K439B Cast Superalloy During Long-Term Aging

作　　者：屈星海 高磊 吴一栋 惠希东[1] 肖程波 陈晶阳 Qu Xinghai;Gao Lei;Wu Yidong;Hui Xidong;Xiao Chengbo;Chen Jingyang(State Key Laboratory of Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]中国航发北京航空材料研究院先进高温结构材料重点实验室,北京100095

出　　处：《稀有金属材料与工程》2025年第2期490-496,共7页Rare Metal Materials and Engineering

基　　金：国家科技重大专项(J2019-VI-0004-0117);先进高温结构材料重点实验室基金项目(6142903220101);国家重点研发计划(2022YFB3706804)。

摘　　要：以承温能力达800℃的K439B合金为研究对象,研究该合金标准热处理态组织中γ′相的形态,以及800℃下时效6000、7000、8000和10000 h过程中的γ′相演变规律和粗化行为。结果表明,合金标准热处理后枝晶干γ′相细小均匀,而枝晶间γ′相呈现出大小两种形态。合金在长期时效后枝晶间区域仍然保留双态型γ′相。合金长期时效后γ′相由标准热处理态的球状逐渐向立方状转变,立方状γ′相获得了互相平行的边界,未出现筏排化现象。合金在长期时效过程中,γ′相尺寸增大,但体积分数变化不明显。γ′相尺寸随时效时长的变化同时符合Lifshitz-Slyozov-Wagner(LSW)和相界面扩散控制理论(TIDC)两种模型,其内在原因认为是由于元素在基体与界面的扩散速率相当。This article took K439B alloy with a temperature bearing capacity of 800℃as the research object to study theγ′phase morphology in the standard heat-treated condition,and theγ′phase evolution and coarsening behavior during aging at 800℃for 6000,7000,8000,and 10000 h.The results indicate that theγ′phase at the dendrites in the alloy is fine and uniform,while theγ′phase between the dendrites presents two types.After long-term aging,the bimodalγ′phase is still retained in the interdendritic region,and theγ′phase transforms from spherical to cubic shape without any rafting phenomenon.During the long-term aging process,theγ′phase size of the K439B increases,but the change in volume fraction is not significant.The variation ofγ′phase size with aging time conforms to both Lifshitz-Slyozov-Wagner(LSW)and theory of interface diffusion control(TIDC)models.The internal reason is believed to be the equivalent diffusion rate of elements between the matrix and interface.

关 键 词：K439B镍基高温合金 长期时效 组织稳定性 γ′相 

分 类 号：TG132.33[一般工业技术—材料科学与工程]