【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。更多还原

【Abstract】 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.更多还原