热处理对热等静压K4169合金组织及高温持久性的影响  

Effects of Heat Treatment on Microstructure and Stress Rupture Properties of K4169 Investment Castings after Hot Isostatically Pressed Treatment

作　　者：凌李石保[1] 韩延峰[1] 王俊[1] 康茂东[1] 孙宝德[1] Lingli Shibao Han Yanfeng WangJun Kang Maodong Sun Baode(School of Materials Science and Engineering, Shanghai Jiaotong Universit)

机构地区：[1]上海交通大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2016年第10期1013-1018,共6页Special Casting & Nonferrous Alloys

摘　　要：研究了热处理工艺对热等静压(HIP)K4169合金铸件微观组织及高温持久性能的影响。结果表明,热等静压处理后的K4169合金铸件进行直接时效(DA)处理,不仅可消除Laves相和针状δ-Ni3Nb脆性相析出问题,还能保留热等静压阶段形成的晶内网络状分布的亚微米级透镜状γ″相。HIP+DA工艺制得的试棒持久性能得到明显提高,这是因为亚微米级透镜状γ″相的存在使得其蠕变变形机制呈现多元化特征。蠕变变形过程中不仅存在位错滑移和攀移,还形成了大量的孪晶组织,从而延长其蠕变寿命,表现出优良的持久性能。Effects of heat treatment on microstructure and stress rupture properties of investment casting K4169 alloy components after hot isostatically pressed（HIP）treatment have been investigated.It is found that amounts ofδ-Ni3 Nb phase with needle-like morphology can be precipitated both at the grain boundaries and in the inter-dendritic region around the carbides for the HIPed specimens with post solution and aging treatment（HIP＋STA）.However,absence of Laves phase and needle-likeδ-Ni_3 Nb phase precipitated in the inter-dendritic region can be observed for the HIPed specimens with direct aging treatment（HIP＋DA）,and the submicronγ″phase precipitated during HIP processing is also preserved in theγ matrix.It clarifies that the hot isostatic pressing with direct aging（HIP ＋ DA）treatment process can improve effectively creep rupture properties both in duration time and elongation.It is suggested that the network submicronγ″particles similar to lens is beneficial for creating a large number of annealing twins,which are contributed to its increase in the stress-rupture properties.

关 键 词：K4169高温合金 热等静压 热处理 持久性能 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG156[金属学及工艺—合金]