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High Temperature Materials and Processes

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Effect of HIP Temperature on Microstructure and Creep Property of FGH95 Alloy

Jun Xie1 / 1 / Xiao-Ming Zhou2

1School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, China

2Beijing Institute of Aeronautical Materials, Beijing, China

Citation Information: High Temperature Materials and Processes. Volume 31, Issue 1, Pages 61–66, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: 10.1515/htmp.2011.129, February 2012

Publication History

Received:
2011-06-19
Accepted:
2011-09-19
Published Online:
2012-02-09

Abstract

By means of hot isostatic pressing (HIP) treatment, microstructure observation and creep properties measurement, the effects of the HIP temperatures on the microstructure and creep properties of FGH95 nickel-base superalloy are investigated. The results show that, when the HIP temperature is lower than solubility of γ' phase, the coarser γ' phase is precipitated in the previous particle boundary (PPB) regions, and the quantity and size of the coarser γ' phase which is distributed in the regions decrease as the HIP temperature increases. No feature of the grain growing up is detected after the alloy is solution treated at 1140 °C. Moreover, there are a few of carbide particles distributing along the grain boundary and in the grain. After HIP treated at 1180 °C and fully heat treated, coarser γ' phase is dissolved in the alloy, and the depleted zone of the fine γ' phase has disappeared. In addition, the grains grow up obviously in the alloy, and the γ' phase and fine carbide particles are dispersedly precipitated in the grains and along boundaries, which can enhance the creep resistance of the alloy. The deformation mechanisms of the alloy are that the dislocations slip in the matrix or shear into γ' phase during creep.

Keywords.: FGH95 superalloy; HIP treatment; microstructure; creep properties; deformation mechanism

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