Acta Metall Sin  2011, Vol. 47 Issue (12): 1581-1590    DOI: 10.3724/SP.J.1037.2011.00522

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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

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.

Abstract References Related Articles Recommended Metrics Download:  PDF(1069KB)  Export:  BibTeX | EndNote (RIS)       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. Key words:  GH738 wrought nickel base superalloy      hot deformation      recrystallization behavior      crostructure evolution      model      Received:  11 August 2011      Fund:  Supported by National Natural Science Foundation of China (No.51071017) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors YAO Zhi-Gao DONG Jian-Xin ZHANG Mai-Cang URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00522     OR     https://www.ams.org.cn/EN/Y2011/V47/I12/1581 [1] Yao Z H, Dong J X, Zhang M C, Zheng L. Rare Met Mater Eng, 2010; 39: 1565 (姚志浩, 董建新, 张麦仓, 郑磊. 稀有金属材料与工程, 2010; 39: 1565) [2] Chang K M, Liu X B. 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