Effect of Nb on δ Phase Precipitation and the Tensile Properties in Cast Alloy IN625

Yiqiang Mu; Changshuai Wang; Wenlong Zhou; Lanzhang Zhou

doi:10.3390/met8020086

Metals (Jan 2018)

Effect of Nb on δ Phase Precipitation and the Tensile Properties in Cast Alloy IN625

Yiqiang Mu,
Changshuai Wang,
Wenlong Zhou,
Lanzhang Zhou

Affiliations

Yiqiang Mu: School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Changshuai Wang: Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China
Wenlong Zhou: School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Lanzhang Zhou: Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China

DOI: https://doi.org/10.3390/met8020086
Journal volume & issue: Vol. 8, no. 2
p. 86

Abstract

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Cast alloy IN625 is a candidate Ni-base alloy for advanced ultra-supercritical (A-USC) power plants. The aim of this study was to investigate the influences of Nb on δ phase precipitation and the tensile properties in this alloy. The results show that the δ phase is easy to precipitate after long-term aging at 700 °C (the service temperature of A-USC power plants) and it is strongly affected by the content of Nb in the alloy. The strength of alloys after aging at 700 °C for 10,000 h increases with the increasing Nb content and also increases sharply when compared to that of as-heat-treated alloys. The increase in strength is found to be primarily associated with the precipitation of the δ phase.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

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