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

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Abstract

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.

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Authors and Affiliations

  1. National Die & Mold CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai, 200030, China

    Da-shan Sui  (隋大山), Liang Gao  (高亮) & Zhen-shan Cui  (崔振山)

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  1. Da-shan Sui  (隋大山)
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  2. Liang Gao  (高亮)
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  3. Zhen-shan Cui  (崔振山)
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Corresponding author

Correspondence to Da-shan Sui  (隋大山).

Additional information

Foundation item: the National Science and Technology Major Project of China (No. 2012ZX04012-011-02) and the National Basic Research Program (973) of China (No. 2011CB012903)

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Sui, Ds., Gao, L. & Cui, Zs. Microstructure evolution of different forging processes for 12%Cr steel during hot deformation. J. Shanghai Jiaotong Univ. (Sci.) 20, 606–611 (2015). https://doi.org/10.1007/s12204-015-1668-x

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  • DOI: https://doi.org/10.1007/s12204-015-1668-x

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