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Microstructure evolution during heat treatment of superalloys loaded with different amounts of carbon

Published online by Cambridge University Press:  26 May 2015

Zhuhuan Yu ,
Junfeng Qiang ,
Jun Zhang  and
Lin Liu
Zhuhuan Yu*
Affiliation:
Material Science and Engineering Department, Xi'an University of Science and Technology, Xi'an 710054, People's Republic of China
Junfeng Qiang
Affiliation:
Material Science and Engineering Department, Xi'an University of Science and Technology, Xi'an 710054, People's Republic of China
Jun Zhang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Lin Liu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effects of heat treatment for recovering microstructure of a Ni-based single crystal superalloy with carbon addition have been evaluated. The heat treatment resulted in increased levels of chemical homogeneity. All the samples experienced more γ′ coarsening than as-cast samples. Significant changes to as-cast carbide morphologies were observed. Script-type, MC carbide networks transformed during heat treatment to smaller, spherical Ta-rich MC carbides. Heat treatment caused significant MC carbide decomposition and formation of Cr-rich secondary carbides on or near to decomposed carbides in all modifications. The size of carbides after heat treatment was less than that of cast alloy obviously, and the distribution of carbides became more and more dispersion than in cast alloy.

Keywords

heat treatmentsuperalloyscarbon additionsmicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 13 , 14 July 2015 , pp. 2064 - 2072
Copyright
Copyright © Materials Research Society 2015 

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