Cai Hualin, Ma Zhixuan, Zhang Jiayi, Hu Jinbing, Qi Liang, Chen Pu, Luo Zhijian, Zhou Xingyu, Li Jingkun, Wang Hebin
School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.
Materials (Basel). 2024 Jul 15;17(14):3500. doi: 10.3390/ma17143500.
Nickel-based superalloys have been widely used in the aerospace industry, and regulating the reinforcing phases is the key to improving the high-temperature strength of the alloy. In this study, a series of aging treatments (650 °C, 750 °C, 850 °C and 950 °C for 8 h) were designed to study different thermal deformation behaviors and microstructure evolutions for a novel nickel-based superalloy. Among the aged samples, the 950 °C aged sample achieved the peak stress of ~323 MPa during the thermal deformation and the highest microhardness of ~315 HV after thermal compression, which were the greatest differences compared to before deformation. In addition, the grains of the 950 °C sample exhibit deformed fibrous shapes, and the grain orientation is isotropic, while the other samples exhibited isotropy. In the 850 °C and 950 °C high-temperature aging samples, the γ' precipitate (about 20 nm in size) is gradually precipitated, which inhibits the movement of dislocation in the grain during compression, thus inhibiting the occurrence of dynamic recrystallization and improving the high-temperature mechanical properties of the alloy.
镍基高温合金已广泛应用于航空航天工业，调控强化相是提高合金高温强度的关键。本研究设计了一系列时效处理（650℃、750℃、850℃和950℃保温8小时），以研究一种新型镍基高温合金的不同热变形行为和微观组织演变。在时效处理后的样品中，950℃时效处理的样品在热变形过程中达到了约323MPa的峰值应力，热压缩后达到了约315HV的最高显微硬度，与变形前相比差异最大。此外，950℃样品的晶粒呈现出变形的纤维状，且晶粒取向各向同性，而其他样品表现出各向同性。在850℃和950℃高温时效样品中，尺寸约为20nm的γ'相逐渐析出，抑制了压缩过程中位错在晶粒内的运动，从而抑制了动态再结晶的发生，提高了合金的高温力学性能。
