论文部分内容阅读
通过对一种单晶镍基合金的差热曲线分析和不同条件热处理后的组织形貌观察,制定合金热处理工艺,并研究了热处理期间γ′相的组织演化规律.结果表明,实验用合金的热处理“窗口”是1 272~1 320℃,在1 300℃时,γ′相有最大的溶解速度,1 040℃析出的γ′相最为稳定,在该温度时效50 h后,γ′相长大,且呈球状和条状形貌,γ′/γ两相之间出现界面位错.因此,确定出该合金的热处理工艺为1 280℃,4 h,A.C+1 300℃,4 h,A.C+1 040℃,4 h,A.C+870℃,24 h,A.C.一次时效促使γ′相长大呈立方体形貌;二次时效期间,γ′相略有长大,立方度增加,排列更加规则.
Through the differential thermal curve analysis of a single crystal nickel-based alloy and the observation of the microstructure after heat treatment under different conditions, the heat treatment process of the alloy was developed and the microstructure evolution of the γ ’phase during the heat treatment was studied. The results show that the experimental alloy The heat treatment “window” is 1 272 ~ 1 320 ℃. At 1 300 ℃, the γ ’phase has the largest dissolution rate, and the γ’ phase precipitated at 1 040 ℃ is the most stable. After aging at this temperature for 50 h, Large and spherical and strip morphology, interfacial dislocations between the γ ’/ γ phases appear.Therefore, the heat treatment process of this alloy is determined to be 1 280 ℃, 4 h, A.C + 1 300 ℃, 4 h, A.C + 1 040 ℃, 4 h, A.C + 870 ℃, 24 h, AC once aging prompted the growth of γ ’phase cubic morphology; secondary aging, γ’ phase grew up slightly, Cubic degrees increase, arranged more rules.