EFFECTS OF Ru AND Cr ON γ/γ' MICROSTRUCTURAL EVOLUTION OF Ni–BASED SINGLE CRYSTAL SUPERALLOYS DURING HEAT TREATMENT

doi:10.3724/SP.J.1037.2010.00108

Acta Metall Sin

2010, Vol. 46

Issue (8): 897-906 DOI: 10.3724/SP.J.1037.2010.00108

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EFFECTS OF Ru AND Cr ON γ/γ' MICROSTRUCTURAL EVOLUTION OF Ni–BASED SINGLE CRYSTAL SUPERALLOYS DURING HEAT TREATMENT

CHEN Jingyang ¹, ZHAO Bin ¹, FENG Qiang ^1,2, CAO Lamei ³, SUN Zuqing ¹

1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083
2. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083
3. National Key Laboratory of Advanced High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095

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CHEN Jingyang ZHAO Bin FENG Qiang CAO Lamei SUN Zuqing. EFFECTS OF Ru AND Cr ON γ/γ' MICROSTRUCTURAL EVOLUTION OF Ni–BASED SINGLE CRYSTAL SUPERALLOYS DURING HEAT TREATMENT. Acta Metall Sin, 2010, 46(8): 897-906.

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Abstract

The influences of Ru and Cr as well as their interaction on the elemental partitioning ratio and microstructural evolution have been investigated in six Ni–based single crystal experimental superalloys with various levels of Ru (0—5.1%) and Cr (0—5.7%) additions (mass fraction). The results indicate that γ′ precipitates are nearly spherical in the dendrite core of the base alloy (Ru and Cr–free), which has a low Re partitioning ratio and near zero lattice misfit, after aging treatment at 1100 ℃ for 8 h. The lattice misfit and Re partitioning ratio increase slightly and the γ′ precipitates change to be more cuboidal with the addition of 5.1%Ru in both Cr–free and Cr–containing alloys. Meanwhile, the Re partitioning ratio increases significantly with increasing the Cr content in both Ru–free and Ru–containing alloys, which in turn results in more negative lattice misfit and more cuboidal γ′ precipitates. After long–term thermal exposure at 1100 ℃, the nearly spherical γ′ precipitates with near zero lattice misfit in the alloy have no change in morphology, and are coarsened after a longer exposure time, while the alloy with intermediate γ′ precipitates and low lattice misfit is coarsened more severely. However, a nearly–rafted structure tend to form in the alloy with nearly cuboidal′ precipitates and intermediate misfit after heat treatment for 800 h. The time to form the rafted structure is significantly reduced in the alloys containing both Ru and Cr with high Re partitioning ratio and high lattice misfit as well as cuboidal or rectangular γ′ precipitates. The alloy containing high Ru and intermediate Cr exhibits a rafted trend after heat treatment for 200 h while the rectangular γ′ precipitates are rafted after heat treatment for only 50 h in the alloy containing high levels of Ru and Cr additions with the highest lattice misfit.

Key words: superalloys Ru Cr γ&prime morphology elemental partitioning ratio lattice misfit

Received: 04 March 2010

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Supported by National Natural Science Foundation of China (No.50671015), Program for New Century Excellent Talents in University, Chinese Ministry of Education (No.NCET–06–0079), High Technology Research and Development Program of China (No.2007AA03A225) and National Basic Research Program of China (No.2010CB631201)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00108 OR https://www.ams.org.cn/EN/Y2010/V46/I8/897

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