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Creep properties of a powder metallurgy disk superalloy at 700 °C

Published online by Cambridge University Press:  09 January 2017

Kaixin Dong Open the ORCID record for Kaixin Dong [Opens in a new window] ,
Chao Yuan ,
Shuang Gao ,
Chonglin Jia ,
Jianting Guo  and
Changchun Ge
Kaixin Dong
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Chao Yuan*
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Shuang Gao
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Chonglin Jia
Affiliation:
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jianting Guo
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Changchun Ge
Affiliation:
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
*
a)Address all correspondence to this author. e-mail: ychao@imr.ac.cn
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Abstract

As the operating temperature of disk service was elevated from 650 °C to 700 °C, the creep properties urged to be paid attention. To investigate the creep properties of spray-formed low solvus, high refractory (LSHR) superalloy at about 700 °C, creep tests were conducted under seven different stress ranging from 690 MPa to 897 MPa. By means of creep curves and fracture microstructure observation, the creep behaviors and fracture mechanisms of spray-formed LSHR were analyzed. Stress exponent of the alloy was comparable to other disk superalloys such as Waspaloy and Inconel 718. It was interesting to find a transition in the creep behavior in two stress regimes. The contribution of grain boundary sliding in the low stress regime was greater than that in the higher stress. Under higher stress microcracks initiated along the intragranular slip bands because of strain concentration. The spray-forming LSHR exhibited a good creep resistance at low stress compared with other two superalloys by using Larson–Miller parameter, which was consistent with the transition of fracture behaviors.

Keywords

creep behaviorspray formingpowder metallurgy superalloyfracture mechanism
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 3 , 14 February 2017 , pp. 624 - 633
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Mathias Göken

References

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