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袁晓飞,吴剑涛,李俊涛,燕平.K424合金超温后显微组织与典型性能研究[J].稀有金属材料与工程(英文),2018,47(6):1779~1785.[Yuan Xiaofei,Wu Jiantao,Li Juntao and Yan Ping.Investigation about microstructures and typical mechanical properties of overheated K424 superalloy[J].Rare Metal Materials and Engineering,2018,47(6):1779~1785.]
Investigation about microstructures and typical mechanical properties of overheated K424 superalloy
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Received:November 06, 2017  Revised:December 28, 2017
Key words: K424 alloy  overheating  mechanical properties  microstructures
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Yuan Xiaofei,Wu Jiantao,Li Juntao and Yan Ping  
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      Stress rupture test at 975℃/196MPa and room temperature tensile test were conducted in standard heat-treated K424 alloy after overheating at different conditions (1050℃~1150℃/2h, air cooling), the characterization of microstructures and fracture features were then investigated. The results showed that mechanical properties of standard heat-treated K424 alloy were only slightly lower after overheating at 1050℃~1150℃ for 2h, the mechanical property indexes were obviously higher than the values in standard. Microstructural characterization indicated that grain morphology, grain boundary morphology and γ’ phase in the interdendritic regions showed no significant change after overheating at different conditions. The more cuboidal primary γ’ phase and the precipitation of secondary γ’ phase in γ channel were responsible for the slightly diminished mechanical properties after overheating. In addition, the high temperature and room temperature fracture mechanisms of overheated K424 alloy were also discussed.