K424合金超温后的显微组织与典型性能
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摘要
以标准热处理态的K424合金为研究对象,对其进行不同条件的超温热处理(1050~1150℃/2 h+空冷)。对超温后的合金进行975℃/196 MPa条件下的高温持久试验和室温拉伸试验,并对其显微组织和断裂特征进行表征。结果表明:标准热处理后的K424合金经过1050~1150℃超温处理2 h并空冷后,力学性能仅发生轻微降低,其力学性能指标仍明显高于标准规定值。组织表征表明:经过不同温度超温处理并空冷后合金晶粒、晶界和枝晶间γ′相的形貌并未呈现出明显的变化。一次γ′相的立方度提高以及γ通道中二次γ′相析出是合金超温后力学性能仅轻微降低的主要原因。同时,对超温后K424合金的高温和室温断裂机制也进行了讨论。
The stress rupture test at 975 ℃/196 MPa and room temperature tensile test were performed on K424 alloys which were standard heat-treated and overheated under different conditions(1050~1150 ℃/2 h, air cooling), and then the microstructure and fracture features were investigated. The results show that the mechanical properties of the standard heat-treated K424 alloy are only slightly decreased after overheating at 1050~1150 ℃ for 2 h, while its mechanical property indexes are obviously higher than the standard values. Microstructure characterization indicates that the grain morphology, grain boundary morphology and γ′ phase of the interdendritic region do not show significant changes after overheating under different conditions. The more cuboidal primary γ′ phase and the precipitation of secondary γ′ phase in γ channel are responsible for the slightly reduced mechanical properties after overheating. In addition, the high temperature and room temperature fracture mechanism of the overheated K424 alloy was also discussed.
The stress rupture test at 975 ℃/196 MPa and room temperature tensile test were performed on K424 alloys which were standard heat-treated and overheated under different conditions(1050~1150 ℃/2 h, air cooling), and then the microstructure and fracture features were investigated. The results show that the mechanical properties of the standard heat-treated K424 alloy are only slightly decreased after overheating at 1050~1150 ℃ for 2 h, while its mechanical property indexes are obviously higher than the standard values. Microstructure characterization indicates that the grain morphology, grain boundary morphology and γ′ phase of the interdendritic region do not show significant changes after overheating under different conditions. The more cuboidal primary γ′ phase and the precipitation of secondary γ′ phase in γ channel are responsible for the slightly reduced mechanical properties after overheating. In addition, the high temperature and room temperature fracture mechanism of the overheated K424 alloy was also discussed.
引文
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[2]Li Shuyuan(李淑媛),Zheng Yunrong(郑运荣).Materials for Mechanical Engineering(机械工程材料)[J],1983(6):47
[3]Kim S G,Hwang Y H,Kim T G et al.Eng Fail Anal[J],2008,15(4):394
[4]Liu Xuan(刘轩).Thesis for Master(硕士论文)[D].Dalian:Dalian Maritime University,2009:9
[5]Lu Wenhai(卢文海),Liu Liyu(刘丽玉),Bai Mingyuan(白明远).Failure Analysis and Prevention(失效分析与预防)[J],2010,5(4):252
[6]Zhao Wenxia(赵文侠),Li Ying(李莹),Fan Yingwei(范映伟)et al.Journal of Materials Engineering(材料工程)[J],2012(8):39
[7]Cai Yulin(蔡玉林),Zheng Yunrong(郑运荣).Metallographic Research of Superalloys(高温合金的金相研究)[M].Beijing:National Defense Industry Press,1986:228
[8]Huff H,Pillhofer H.In:Reichman S eds.Superalloys 1988[C].Warrendale,PA:TMS,1988:835
[9]Tong Jinyan(童锦艳),Feng Wei(冯微),Fu Chao(付超)et al.Acta Metallurgica Sinica(金属学报)[J],2015,51(10):1242
[10]High Temperature Materials Branch of Chinese Metals Society(中国金属学会高温材料分会).China Superalloys Handbook(中国高温合金手册)[M].Beijing:Standards Press of China,2012:168
[11]Pollock T M,Argon A S.Acta Metall Mater[J],1994,42(6):1859
[12]Torster F,Baumeister G,Albrecht J et al.Mater Sci Eng A[J],1997,234-236:189
[13]Yuan X F,Song J X,Zheng Y R et al.Mater Sci Eng A[J],2016,651:734
[14]Jackson J J,Donachie M J,Henricks R J et al.Metall Trans A[J],1977,8(10):1615
[15]Zhang P,Yuan Y,Li B et al.Mater Sci Eng A[J],2016,655:152
[16]Carroll L J,Feng Q,Mansfield J F et al.Metall Mater Trans A[J],2006,37(10):2927
[17]Carroll L J,Feng Q,Pollock T M.Metall Mater Trans A[J],2008,39(6):1290
[18]Osada T,Gu Y F,Nagashima N et al.In:Huron E S eds.Superalloys 2012[C].Warrendale,PA:TMS,2012:121
[19]Walston W S,Bernstein I M,Thompson A W.Metall Trans A[J],1991,22(6):1443
[20]Liu L R,Jin T,Zhao N R et al.Mater Sci Eng A[J],2003,361:191