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Effects of microstructure and γ′ distribution on the hot deformation behavior for a powder metallurgy superalloy FGH96

Published online by Cambridge University Press:  27 November 2014

Chi Zhang ,
Liwen Zhang ,
Mengfei Li ,
Wenfei Shen  and
Sendong Gu
Chi Zhang
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, China; and Key Laboratory for Metallurgical Equipment and Control of Education Ministry, WUHAN University of Science and Technology, Wuhan, 430081, Hubei, China
Liwen Zhang*
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, China
Mengfei Li
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, China
Wenfei Shen
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, China
Sendong Gu
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Aiming to clarify the effects of initial states on hot deformation behavior of a powder metallurgy nickel-based superalloy FGH96, specimens in hot isostatic pressed (HIPed) and solution states were isothermally compressed in the temperature range of 1000–1150 °C and the strain rate range of 0.001–1.0 s−1. It revealed that the flow behavior of FGH96 was dependent on the initial states, in which the deformation resistance was higher in the solution state than that in the HIPed state at evaluated temperatures, and the differences became less when the temperature was higher than the γ′ dissolution temperature. The calculated hot activation energy using peak stresses are 590 and 1285 kJ mol−1 for HIPed and solution specimens. Comparison with HIPed specimen, the efficiency of power dissipation (η) in solution specimen is less, and the optimum workability regime moves to higher temperatures. Cracking and in-grain shear bands were observed in the specimens when compressed in flow instability areas.

Keywords

powder metallurgyhot isostatic pressing (HIP)second phasesmicrostructurehot deformation behaviorprocessing map
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 23 , 14 December 2014 , pp. 2799 - 2808
Copyright
Copyright © Materials Research Society 2014 

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