Co对K4169合金铸态组织和性能的影响  

Effect of Co on As-Cast Structure and Properties of K4169 Superalloy

作　　者：李亚敏[1] 刘洪军[1] 刘杰[2] 安蓓[2] 郝远[1] 

机构地区：[1]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050 [2]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《铸造技术》2010年第3期280-283,共4页Foundry Technology

基　　金：甘肃省自然科学基金项目(3ZS042-B25-028);兰州理工大学有色金属合金及加工教育部重点实验室开放基金(EKL07009)

摘　　要：采用手工电弧炉熔炼制备了不同Co含量的K4169高温合金,显微组织和力学性能的研究表明:Co强烈促进Laves相的形成,缩小合金枝晶间偏析区;随着Co含量从0.5%增加到0.8%,Laves相由小块状变为筛网状且数量明显增多;合金中强化相γ′相的数量也随Co含量的增加而增多。Co元素的加入使K4169铸态合金的室温压缩强度有所提高,合金的硬度稍有降低,但总体来说Co元素的增加对铸态合金的室温压缩强度和硬度的影响较小。K4169 superalloy with different Co contents was prepared by arc melting in manual electric arc furnace. The analysis of the microstructure and mechanical properties showed that Co significantly promotes the precipitation of Laves phase and reduces the segregated area at the grain boundaries. With the content of Co increases from 0.5 wt% to 0. 8 wt%, the morphology of Laves phase precipitates varies from lump shape to net structure and the amount increases considerably. Meanwhile, the amount of γ′ phase increases with increasing Co content. The addition of Co enhances the compressive strength at room temperature but slightly decreases the hardness. However, the effects of Co content on mechanical properties of the as-cast K4169 superalloy were slightly.

关 键 词：K4169高温合金 CO 显微组织 力学性能 

分 类 号：TG136.1[一般工业技术—材料科学与工程]