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| EFFECTS OF Re AND Ru ON MICROSTRUCTURE AND SEGREGATION OF Ni-BASED SINGLE-CRYSTAL SUPERALLOYS |
| LIU Gang, LIU Lin, ZHANG Shengxia, YANG Chubin, ZHANG Jun, FU Hengzhi |
| State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072 |
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Cite this article:
LIU Gang LIU Lin ZHANG Shengxia YANG Chubin ZHANG Jun FU Hengzhi. EFFECTS OF Re AND Ru ON MICROSTRUCTURE AND SEGREGATION OF Ni-BASED SINGLE-CRYSTAL SUPERALLOYS. Acta Metall Sin, 2012, 48(7): 845-852.
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Abstract The influence of Re and Ru on segregation and microstructure evolution during heat treatment has been investigated in four Ni-based single-crystal superalloys with varied contents of Re (3%-6%, mass fractions) and Ru (0% and 3%). The additions of Re and Ru lead to the more severe segregation of alloying elements in as-cast structures. However, the effects of Ru on as-cast segregation can be neglected after the stepwise solution heat treatments. The additions of Re and Ru lead to the lower γ'-coarsening rate, more cuboidal γ'-morphology and reduced γ'-size. Electron microprobe analysis (EPMA) indicates that Al, Ta and Ni partition to the γ'-precipitates, whereas Re and Cr strongly partition to the γ-matrix. In comparison to Re and Cr, Ru and W show the less tendency to partition to the γ-matrix. Additionally, Re increases the supersaturation of Re, Cr, Co and W in the γ-matrix, whereas Ru only slightly suppresses the partition of these TCP-forming elements to the γ-matrix.
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Received: 04 January 2012
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