Transactions of Materials and Heat Treatment

Title：Microstructure analysis on extruded nickel-based powder superalloy

Authors： Song Xiaojun Wang Chaoyuan Wang Yu Zhou Lei Zou Jinwen

Unit： Beijing Institute of Aeronautical Materials

KeyWords： extruded nickel-base powder superalloy microstructure recrystallization γ′ phase subgrains dislocation cells

ClassificationCode：TG430.10

year,vol(issue):pagenumber：2020,45(12):195-202

Abstract：

The nickel-based powder superalloy was extruded in the condition of the extrusion ratio of 4∶1, the extrusion speed of 20 mm·s-1 and the deformation temperature of 1050-1180 ℃, and the extruded samples were kept at 1000-1100 ℃ for 10-120 min to analyze the microstructure and recrystallized grain nucleation and growth of extruded nickel-based powder superalloy and its heat treatment process. The results show that there are two types of γ′ phases in extruded nickel-based powder superalloy. The large-sized γ′ phases are mostly distributed on the grain boundary with a size of about 1-2 μm, and the small-sized γ′ phases size are mostly distributed inside the grains with a size of about 200 nm which is distributed in a dispersed state. After heat treatment at 1080 and 1100 ℃ for 10, 30, 60 and 120 min, the content and size of the large-size γ′ phase do not change much, and the small-sized γ′ phase is almost completely dissolved. Furthermore, the dislocation cells formed in the process of hot extrusion deformation rearrange and cancel to form subgrains during the heating process, and then form the recrystallized core, and the growth of recrystallized core is driven by strain energy and interface energy. Due to the existence of the large-sized γ′ phase in the alloy, the migration of grain boundary is affected by the pinning of γ′ phase during the growth process after recrystallization and nucleation to suppress the growth of grains，which make the alloy grain structure have good thermal stability.

Funds：

宋晓俊（1985-），男，硕士，工程师 E-mail：songxiaojun25@126com

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