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Effects of cold rolling on the precipitation and the morphology of δ-phase in Inconel 718 alloy

Published online by Cambridge University Press:  15 February 2016

Yunpeng Mei ,
Chenxi Liu ,
Yongchang Liu ,
Xiaosheng Zhou ,
Liming Yu ,
Chong Li ,
Zongqing Ma  and
Yuan Huang
Yunpeng Mei
Affiliation:
State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Chenxi Liu
Affiliation:
State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Yongchang Liu*
Affiliation:
State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Xiaosheng Zhou
Affiliation:
State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Liming Yu
Affiliation:
State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Chong Li*
Affiliation:
State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Zongqing Ma
Affiliation:
State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
Yuan Huang
Affiliation:
State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300072, People's Republic of China
*
a) Address all correspondence to this author. e-mail: licmtju@163.com
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Abstract

To investigate the effects of cold rolling on the microstructure, the precipitation behavior and the morphology of δ-phase, Inconel 718 alloy samples with different cold rolling reductions were aged for different periods at temperatures range from 850 °C to 1000 °C. Detailed microstructural observations and quantitative measurements were conducted to characterize the evolution of the δ-phase during aging. The results show that the microstructure consists of large deformed grains as a result of a slow static recovery at the low aging temperatures (850 and 900 °C); whereas the austenite matrix is fully recrystallized at the high aging temperatures (950 and 1000 °C). It is also found that the amount of δ-phase and the number density of spherical δ-phase particles increase with the increase in the degree of cold rolling both at low and high aging temperatures. With respect to different microstructural changes for the cold-rolled samples at the low or the high aging temperatures, two distinct mechanisms have been, respectively, introduced to interpret the changes in the precipitation behavior and the appearance of δ-phase.

Keywords

cold workingphase transformationNi

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Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 4 , 29 February 2016 , pp. 443 - 454
Copyright
Copyright © Materials Research Society 2016 

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References

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