Characterization of Hot Deformation Behavior and Processing Map of As?Cast H13 Hot Work Die Steel

Yahui Han; Changsheng Li; Jinyi Ren; Chunlin Qiu; En LI; Shuaishuai Chen

doi:10.1007/s12540-020-00863-x

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자료유형: 학술저널

저자정보: Yahui Han (Northeastern University) Changsheng Li (Northeastern University) Jinyi Ren (Northeastern University) Chunlin Qiu (Northeastern University) En LI (Northeastern University) Shuaishuai Chen (Northeastern University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.9

발행연도: 2021.9

수록면: 3,574 - 3,589 (16page)

DOI: 10.1007/s12540-020-00863-x

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The hot-working behavior of as-cast H13 hot work die steel was investigated in the method of isothermal compression testinvolving the wide deformation temperatures of 900?1150 °C and strain rates of 0.01?10 s?1, with the true strain to 0.8, onthe MMS-200 thermo-mechanical simulator. Two characteristic parameters involving the critical strain for DRX initiation(c ) and the strain for peak stress (p ) were identified. The ratio of critical strain to peak strain ranged from 0.26 to 0.6, whichdecreased with the increase in temperature and decrease in strain rate. Processing maps were established using dynamicmaterial model at strains of 0.2, 0.4, 0.6, 0.8. The power dissipation maps were not significantly affected by the strain, whilethe instability maps were sensitivity with the strain when it was over 0.4. The area of instability domain at strain of 0.8 wasthe largest. The instable characteristics contained the mixed grain structure, adiabatic shear band, intense deformation inserious deformation area and brittle elemental segregation area. The chief effect on the power dissipation was the strain rate,the optimum hot working parameters at strain of 0.8 (910?985 °C, 1010?1150 °C and 0.01?0.05 s?1) were determined. Inthis filed, the original coarse as-cast grains were gradually refined by dynamic recrystallization mechanism and the DRXgrain numbers had a significant increase with the increase of power dissipation efficiency.

#As-cast H13 steel #Hot deformation behavior #Processing map #Instable characteristics #Optimum hot-working window

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J. Luan / 2013 / Mater. Sci. Technol 30(2):211~219

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