Bai Yaguan,Nie Yihong,Yang Xiaoyu,et al.Effect of Solution Heat Treatment Temperature and Cooling Mode on Microstructure and Mechanical Property of Ni-Cr-Mo-Co Alloy[J].Special Steel,2025,46(04):150-156.
Bai Yaguan,Nie Yihong,Yang Xiaoyu,et al.Effect of Solution Heat Treatment Temperature and Cooling Mode on Microstructure and Mechanical Property of Ni-Cr-Mo-Co Alloy[J].Special Steel,2025,46(04):150-156. DOI: 10.20057/j.1003-8620.2025-00068.
Effect of Solution Heat Treatment Temperature and Cooling Mode on Microstructure and Mechanical Property of Ni-Cr-Mo-Co Alloy
The influence laws of solution treatments at diverse temperatures and the cooling modalities subsequent to solution treatments on the microstructure and properties of the alloy were investigated. The outcomes reveal that within the temperature range of 1 100 ℃ - 1 160 ℃, with the elevation of the solution treatment temperature, carbides dissolve back into the matrix, which makes the grain grow and has a certain adverse effect on the strength and plasticity of the alloy. More thorough dissolution of carbides can further facilitate the precipitation of more continuous M
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C
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- type carbides along the grain boundaries during the ensuing aging treatment, consequently reducing the mechanical properties of the alloy. Taking into account the microstructure characteristics, 1 140 ℃ can be chosen as the solution trea
tment temperature for this alloy.A relatively sluggish cooling approach subsequent to the alloy's solution treatment augments the precipitation propensity of M
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C type carbides and the size of these carbides. Additionally, it can prompt the precipitation of the γ′ phase, thereby enhancing the strength of the alloy. In the event that the alloy undergoes air - cooling subsequent to solution treatment, a substantial quantity of fine granular carbides will precipitate at the sites of the original carbides and their adjacent regions during the aging treatment. Abundant γ′ phases precipitate both during the slow - cooling process following solution treatment and during the aging treatment, remarkably elevating the strength of the alloy. Simultaneously, the precipitation of a large number of carbides at the grain boundaries attenuates the strength of the grain boundaries, imposing an adverse influence on the plasticity and impact energy of the alloy.
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