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Hot deformation behaviors of a new hot isostatically pressed nickel based powder metallurgy superalloy

Published online by Cambridge University Press:  03 November 2016

Guoai He ,
Feng Liu ,
Lan Huang  and
Liang Jiang
Guoai He
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; and High Temperature Materials Research Institute, Central South University, Changsha 410083, China
Feng Liu
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; and High Temperature Materials Research Institute, Central South University, Changsha 410083, China
Lan Huang*
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; and High Temperature Materials Research Institute, Central South University, Changsha 410083, China
Liang Jiang
Affiliation:
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; and High Temperature Materials Research Institute, Central South University, Changsha 410083, China
*
a) Address all correspondence to this author. e-mail: lhuang@csu.edu.cn
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Abstract

Hot compression tests of a hot isostatically pressed (HIPed) Ni based powder metallurgy (P/M) superalloy were carried out under various combinations of temperatures and strain rates. To bridge the relationship between stresses and strain rates, constitutive equations were established based on a hyperbolic sine Arrhenius equation, which yielded predicted stresses under the test conditions. It was found that the predict values fit the experimental values with good accuracy. Processing maps of the alloy under the test conditions were established; and the corresponding microstructures after test were examined to elaborate the workability of the alloy. It revealed that surface cracks occurred when strain was higher than 0.25, which initiated at the prior powder boundaries (PPBs) and propagated along the boundaries. The optimum hot working parameters for the alloy were proposed to beat the strain rate of 0.014 s−1 and 1075 °C.

Keywords

powder metallurgy superalloyhot isostatic pressing (HIP)microstructure
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 22 , 28 November 2016 , pp. 3567 - 3579
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Copyright
Copyright © Materials Research Society 2016 

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