铸造工艺对K424合金涡轮组织和性能的影响  

Influence of Casting Technology on Structure and Mechanical Properties of K424 Superalloy Turbine Casting

作　　者：李俊涛[1] 邵冲[1] 李维[1] 孔胜国[1] 吴剑涛[1] 赵明汉[1] 

机构地区：[1]钢铁研究总院,北京100081

出　　处：《材料工程》2006年第z1期297-299,303,共4页Journal of Materials Engineering

基　　金：国家自然科学基金项目资助(50375046)

摘　　要：研究了不同铸造工艺对K424合金涡轮铸件组织和性能的影响,实验结果表明:浇注温度和模壳温度越高,铸件晶粒越大,越容易在靠近浇口部位产生缩孔缺陷;反之,晶粒越小,组织越均匀,铸件成型和补缩越困难,内部显微疏松越严重,力学性能波动越大;通过采用一定的强化控制凝固冷却措施,有利于涡轮铸件轮盘部位的凝固补缩。当模壳温度为950℃、浇注温度为1470℃,并采用适当的强化控制凝固冷却措施时,K424合金涡轮铸件获得较理想的显微组织、优良的综合力学性能。The influence of different casting technology on structure and mechanical properties of K424 superalloy turbine was studied.With the increase of pouring and mold temperature,grain size is larger and macro-porosity forms easily,on contrast,grain size becomes smaller and casting is fed more difficultly and micro-porosity is graver.Controlled strengthening cooling during solidification is benefit to feeding of turbine.When mold temperature and pouring temperature are 950℃ and 1470℃ respectively,and proper controlled strengthening cooling is adopted,turbine gaining preferably microstructure and excellent mechanical properties.

关 键 词：铸造工艺 K424合金 组织 力学性能 

分 类 号：TQ174[化学工程—陶瓷工业]