晶粒度对K477高温合金组织及力学性能的影响  

Effect of Grain Size on Microstructure and Mechanical Properties of K477 Superalloy

作　　者：路庆典 刘国怀[1] 王晔[2] 王昭东[1] Lu Qingdian;Liu Guohuai;Wang Ye;Wang Zhaodong(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819 [2]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150080

出　　处：《有色金属加工》2023年第2期20-24,共5页Nonferrous Metals Processing

基　　金：国家自然科学基金(52071065);中央高校基础科研业务费(N2007007)。

摘　　要：采用光学显微镜、扫描电镜和室温力学拉伸等方法,研究了晶粒度对K477高温合金组织及力学性能的影响。结果表明,对于三种不同晶粒度的合金试样,随晶粒尺寸的减小,其析出强化相体积分数增加,而强化相的平均尺寸减小。晶粒度为一级的试样在热处理后,γ′相大部分呈立方形且分布均匀。同时热处理态K477合金的力学性能随晶粒度减小,合金塑性提高,屈服强度及抗拉强度增大,细晶试样抗拉强度高达1128MPa。In this paper,the effect of grain size on the microstructure and mechanical properties of K477 superalloy are studied by means of optical microscope,scanning electron microscope(SEM)and tensile test at room temperature.The results show that the volume fraction of precipitated strengthening phase increases and the average size of strengthening phase decreases with the decrease of grain size for the alloy samples with three different grain sizes.After heat treatment,most of theγ′phases are cubed and evenly distributed.At the same time,the mechanical properties of heat treated K477 alloy increase with the decrease of grain size,the plasticity of the alloy increases,the yield strength and tensile strength increase and the tensile strength of fine grain sample reaches 1128 MPa.

关 键 词：K477合金 晶粒度 γ′相 力学性能 

分 类 号：TG146.15[一般工业技术—材料科学与工程]