Microstructure evolution of different forging processes for 12%Cr steel during hot deformation

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• 作者：Da-shan Sui 隋大寿/a> ; Liang Gao 高亮…
• 关键词：microstructure ; forging process ; hot deformation ; grain size ; numerical simulation
• 刊名：Journal of Shanghai Jiaotong University (Science)
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：20
• 期：5
• 页码：606-611
• 全文大小：1,748 KB
• 参考文献：[1] Ennis P J, Quandakkers W J. 9-12% chromium steels: Application limits and potential for further development [C]//Parson 2000 for Advanced Materials for 21st Century Turbines and Power Plant: Proceedings of the Fifth International Charles Parsons Turbine Conference. London, UK: IOM Communications, 2000: 265–275.
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• 作者单位：Da-shan Sui 隋大山 (1)
  Liang Gao 高亮 (1)
  Zhen-shan Cui 崔振山 (1)
  
  1. National Die & Mold CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai, 200030, China
  
• 刊物类别：Engineering
• 刊物主题：Electrical Engineering
  Life Sciences
  Architecture
  Chinese Library of Science
  
• 出版者：Shanghai Jiao Tong University Press
• ISSN：1995-8188

文摘

Five forging experiments were designed and conducted to investigate the effect of process parameters on microstructure evolution during hot deformation for X12CrMoWVNbN10-1-1 steel. The experimental results indicated that average grain size became finer with the increasing number of upsetting and stretching. Especially, the size of stretching three times with upsetting twice had the most remarkable effect on refinement, and the size was only 27.36% of the original one. Moreover, the stress model was integrated into the software and finite element models were established. Simulation results demonstrated that the strain at center point of workpiece was far larger than critical strain value in each process, so that dynamic recrystallization (DRX) occurred in each workpiece, which implied DRX could occur for several times with the increasing number of upsetting and stretching, and uniform finer microstructure would be obtained. However, the results also showed that higher temperature was an unfavorable factor for grain refinement, so the times of heating should be limited for workpiece, and as many forging processes as possible should be finished in once heating.