热处理制度对K465合金组织和性能的影响  

Influence of Heat Treatment Process on Microstructure and Mechanical Properties of Cast Superalloy K465

作　　者：顾玉丽[1] 郑健峰 曹江[3] 陶春虎[1] 刘昌奎[1] 

机构地区：[1]北京航空材料研究院中航工业失效分析中心,航空材料检测与评价北京市重点实验室,北京100095 [2]中航工业成都发动机集团有限公司,成都610503 [3]中国人民解放军驻四二0厂军事代表室,成都610503

出　　处：《宇航材料工艺》2015年第6期82-86,共5页Aerospace Materials & Technology

摘　　要：研究了两种热处理工艺对K465铸造高温合金组织和力学性能的影响,并与原叶片合金进行了对比分析。采用普通工艺和热等静压工艺制造K465合金,利用光学显微镜和扫描电镜观察合金的显微组织形貌,测试了拉伸性能和持久性能。结果表明,与原叶片相比,K465铸造高温合金叶片的组织特点是,晶粒度较小、枝晶组织偏大、γ'相尺寸较大。热等静压工艺可消除K465合金中的铸造疏松,普通工艺叶片的疏松分布较密集。与普通工艺相比,热等静压工艺使合金中γ'相尺寸明显减小,枝晶组织致密化,拉伸性能和持久性能有所提高。K465合金中少量的疏松、致密的枝晶组织、规则的枝晶排列、较小的γ'相尺寸可能是决定叶片良好振动疲劳性能的关键因素。Two kinds of heat treatment process was studied on the influence of the microstructure and mechanical properties of K465 casting superalloy, the comparison with the same level superalloy used in the generic blade was performed. The microstructures of K465 alloy were observed using optical microscopy （OM） and scan electron mi- croscopy （SEM）. The tensile and stress rupture properties of K465 alloy were measured. The results show that the characteristics of blade made in china are smaller grain size, bigger dendritic structure, bigger size of γ＇ phase by comparison with the same level superalloy used in the generic blade. The hot isostatic pressing （HIP） process may be partially or completely eliminated the loose in K465 alloy, however, the loose distribution is dense for the ordinary process. HIP process can effectively reduce the size of γ＇ phase, make dendritic densification and improve the tensile and stress rupture properties. A small amount of loose, dense dendritic structure, regular dendritic arrangement and the smaller size of γ＇ phase may be the key factor of vibration fatigue property for the blade.

关 键 词：K465高温合金 疏松 组织 力学性能 

分 类 号：TG132.3[一般工业技术—材料科学与工程]