Transactions of Materials and Heat Treatment

Title：Recrystallization behavior of 740H nickel-based alloy under different thermal deformation processes

Authors： Ge Dongwei Liu Kehong Zhang Ruifeng Liu Xiaorong Tian Guangrong Wang Quanwei

Unit： Inner Mongolia North Heavy Industry Group Corp.Ltd.

KeyWords： 740H nickel-based alloy thermal deformation dynamic recrystallization γ′ phase grain refinement

ClassificationCode：TG146.1

year,vol(issue):pagenumber：2025,50(3):231-242

Abstract：

To support the research on the thermal deformation process of large-diameter nickel-based alloy tubes, the relationship between thermal deformation in different wall thickness regions and recrystallization in nickel-based alloy tubes were anlayzed. Using a thermal simulation testing machine, the physical simulation experiments combined with metallographic analysis and SEM observations were conducted to study the recrystallization behavior and characteristics of precipitated phases in 740H nickel-based alloy during the thermal deformation. The results indicate that dynamic recrystallization (DRX) behaviour significantly occurred in 740H alloy during thermal deformation process. The deformation parameters have an important influence on the grain morphology of 740 nickel-based alloy after thermal deformation. When the deformation temperature is 1185 ℃, the deformation amount is 50% and 70%, and the strain rates are 0.1 and 0.01 s-1, the grains are fine and uniform. When the deformation temperature is 1250 ℃, the specimens with a deformation amount of 50% all exhibit the phenomenon of grain growth in varying degrees Meanwhile, the precipitates in the deformation process of 740H nickel-based alloy are γ′ phase by energy spectrum analysisThe study on the dynamic recrystallization behavior of 740H nickel-based alloy can effectively guide the research on the extrusion deformation process of large-diameter nickel-based alloy tubes.

Funds：

作者简介：葛东伟（1985-），男，学士，高级工程师 E-mail：gedongwei20@163.com

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