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| α-Cr precipitation behavior and its effect on high Cr-containing superalloys |
| DONG Jianxin; XIE Xishan |
| Department of Superalloy and Application; University of Science and Technology Beijing |
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Cite this article:
DONG Jianxin; XIE Xishan. α-Cr precipitation behavior and its effect on high Cr-containing superalloys. Acta Metall Sin, 2005, 41(11): 1159-1166 .
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Abstract Theα-Cr precipitation behavior and its effects on the different Cr-containing superalloys, such as GH169, GH625, GH648 and two high-Cr tested alloys, were investigated by microstructure analysis approach in order to compare their behavior and optimize theα-Cr phase morphology. The results show that noα-Cr phase was observed after a standard heat treatment but with long-term aging theα-Cr phase precipitates and grows usually clinging to δ phase in GH169 alloy and clinging to M6C carbide andδphase in GH625 alloy. However, for high Cr-containing alloys (Cr>30%, GH648 and two tested alloys), the α-Cr phase with various morphologies precipitates directly from austenitic matrix and from short-plate to long acicular and lamellar shape. Furthermore, the optimization of α-Cr phase was initially studied by a special heat treatment in order to obtain fine and uniform α-Cr particles.
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Received: 30 June 2005
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