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Electron backscattered diffraction analysis of the effect of deformation temperature on the microstructure evolution in a typical nickel-based superalloy during hot deformation

Published online by Cambridge University Press:  25 April 2016

Shengxue Qin ,
Hongbin Zhang ,
Jie Liu  and
Wei Zheng
Shengxue Qin
Affiliation:
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, People's Republic of China
Hongbin Zhang*
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
Wei Zheng
Affiliation:
School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, People's Republic of China
*
a) Address all correspondence to these authors. e-mail: 1986_wawq@163.com
b) e-mail: 15275177928@163.com
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Abstract

The microstructure evolution of a typical nickel-based superalloy was studied in the temperature range of 960–1160 °C with the strain rate of 0.001 s−1 by using electron backscattered diffraction technique. Based on the grain orientation spread method, the dynamic recrystallization (DRX) grains were distinguished from the deformed grains. The results revealed that the volume fraction and the size of DRX grains increased with the increasing deformation temperatures. Most of the original Σ3 boundaries lost their twin characteristics due to crystal rotations during hot deformation. Meanwhile, lots of new Σ3 boundaries were formed in the DRX grains mainly by growth accidents. Moreover, the deformation temperature had a similar effect on the fraction of Σ3 boundary and the Σ3 boundary density in the DRX domains, which increased firstly and then decreased with the increasing deformation temperature. The Σ3 boundary density was analyzed as a function of grain size, and the critical grain size below which no twin forms was calculated to be 2.06 µm. In addition, the coherent Σ3 boundaries were easier to form at the higher deformation temperature due to their lower boundary energy.

Keywords

nickel-based superalloyEBSDdynamic recrystallizationΣ3 boundary

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Type
Articles
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Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1348 - 1360
Copyright
Copyright © Materials Research Society 2016 

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