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EBSD study of strain dependent microstructure evolution during hot deformation of a typical nickel-based superalloy

Published online by Cambridge University Press:  15 November 2018

Hongbin Zhang
Affiliation:
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Shengxue Qin
Affiliation:
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China; and Qingdao Yutong Pipe Industry Co., Ltd., Qingdao RTP Engineering Technology Center, Qingdao 266590, People’s Republic of China
Huiping Li
Affiliation:
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Jie Liu
Affiliation:
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Yuting Lv
Affiliation:
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Yan Wang
Affiliation:
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Peng Zhang
Affiliation:
Fushun Special Steel Co., Ltd., Tech Center, Fushun 113000, People’s Republic of China
Haiping Zhou
Affiliation:
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China
Tao Wu
Affiliation:
Engineering Training Center, Shandong University, Jinan 250002, People’s Republic of China
Corresponding
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Abstract

The microstructure evolution of a typical nickel-based superalloy was studied in the strain range of 0.1–0.9 at 1110 °C/0.01 s−1 by using the electron backscattered diffraction technique. It was found that the evolution of recrystallized microstructures, grain boundary characteristics, and textures was closely related to strain level. With the increasing strain level, the fraction of equiaxed dynamic recrystallization (DRX) grains increased significantly at the expense of the large non-recrystallized grains, and there was a decrease in total low angle grain boundaries fraction and a simultaneous increase in the fraction of high angle grain boundaries. In addition, the occurrence of DRX promoted the formation of Σ3 boundaries, and the coherent Σ3 boundaries were much easier to form at the strain above 0.5. On the other hand, 〈100〉 component of the textures became stronger with the increasing strains, and the lack of 〈111〉 orientations can also be observed in the textures at high strains above 0.7.

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Copyright
Copyright © Materials Research Society 2018 

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