Effects of Ru on Microstructure and Stress Ruputure Property of Ni-based Single Crystal Superalloy DD22

LUO Yushi; ZHAO Yunsong; YANG Shuai; ZHANG Jian; TANG Dingzhong

doi:10.11868/j.issn.1005-5053.2016.3.014

Journal of Aeronautical Materials (Jun 2016)

Effects of Ru on Microstructure and Stress Ruputure Property of Ni-based Single Crystal Superalloy DD22

LUO Yushi,
ZHAO Yunsong,
YANG Shuai,
ZHANG Jian,
TANG Dingzhong

Affiliations

LUO Yushi: Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
ZHAO Yunsong: Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
YANG Shuai: Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
ZHANG Jian: Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
TANG Dingzhong: Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;

DOI: https://doi.org/10.11868/j.issn.1005-5053.2016.3.014
Journal volume & issue: Vol. 36, no. 3
pp. 132 – 140

Abstract

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The effects of Ru on the as-cast, heat-treated microstructures and stress rupture properties under 1100-1150 ℃ were investigated in new generation Ni-based single crystal superalloys DD22 with two levels of Ru (0% and 2%, mass fraction) additions. The results indicate that the addition of Ru results in the decrease of the solidus and liquidus temperatures, the volume fraction of (γ+γ') eutectic as well as solidification segregation. The size of γ' phase and elemental partitioning ratio of Re and Cr which are important for the precipitation of TCP phase decreases after heat treatment with Ru addition. Ru addition decreases the size of γ' phase, increases γ/γ' misfit and solution strengthening effect and inhibits the precipitation of TCP phase in the process of stress rupture loading, which finally improve the stress rupture properties of DD22 alloy significantly.

Published in Journal of Aeronautical Materials

ISSN: 1005-5053 (Print)
Publisher: Journal of Aeronautical Materials
Country of publisher: China
LCC subjects: Technology: Motor vehicles. Aeronautics. Astronautics
Website: http://jam.biam.ac.cn/indexen.htm

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