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MICROSTRUCTURE CONTROL AND PREDICTION OF GH738 SUPERALLOY DURING HOT DEFORMATION
I. Construction of Microstructure Evolution Model |
YAO Zhihao, DONG Jianxin, ZHANG Maicang |
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 |
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Cite this article:
YAO Zhihao DONG Jianxin ZHANG Maicang. MICROSTRUCTURE CONTROL AND PREDICTION OF GH738 SUPERALLOY DURING HOT DEFORMATION
I. Construction of Microstructure Evolution Model. Acta Metall Sin, 2011, 47(12): 1581-1590.
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Abstract The hot deformation behavior of GH738 superalloy with different initial grain sizes was studied using hot compression experiments via Gleeble–1500. Correlations between flow stress, process parameters and microstructure evolution were characterized in the temperature range of 1000—1160 ℃, strain rate range of 0.01—10 s−1 and engineering strain range of 15%—70%. Besides, metadynamic recrystallization and static recrystallization were studied in the temperature range of 1040—1120 ℃, strain rate range of 0.1—10 s−1 and engineering strain range of 15%—50% with soaking time for 0—45 s; grain growth behavior was researched in the temperature range 980—1140 with soaking time for 0—4 h. The results show that recrystallization behavior of GH738 superalloy was significantly affected by initial grain size, deformation temperature, strain and strain rate. Thermomechanical behavior and microstructural evolution models were systematically constructed based on the investigation of dynamic recrystallization, meta–dynamic recrystallization, static recrystallization and grain growth. The analyses indicate that these models shows a high correlation with actual results of GH738 superalloy.
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Received: 11 August 2011
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Fund: Supported by National Natural Science Foundation of China (No.51071017) |
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