High-Temperature Deformation Characteristics and Constitutive Model of an Ultrahigh Strength Steel

YiBo Xiong; DongXu Wen; JianJun Li; Kang Wang; ZhiZhen Zheng

doi:10.1007/s12540-020-00944-x

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자료유형: 학술저널

저자정보: YiBo Xiong (Huazhong University of Science and Technology) DongXu Wen (Huazhong University of Science and Technology) JianJun Li (Huazhong University of Science and Technology) Kang Wang (Huazhong University of Science and Technology) ZhiZhen Zheng (Huazhong University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.10

발행연도: 2021.10

수록면: 3,945 - 3,958 (14page)

DOI: 10.1007/s12540-020-00944-x

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The high-temperature deformation characteristics of an ultrahigh strength steel is studied by hot compression tests under thedeformation temperatures of 920?1160 °C and strain rates of 0.01?10 s?1. By employing the metalloscope and transmissionelectron microscope, the influences of deformation parameters (deformation temperature and strain rate) upon microstructureevolution are analyzed in detail. Results show that the hot deformation activation energy of the studied steel is estimated as332.3 kJ/mol. The microstructure presents the typical dynamic recrystallization (DRX) features, and the DRX behaviorsare mainly dominated by the discontinuous DRX mechanism under different deformation parameters. Under the low strainrate or the high deformation temperature, the continuous DRX behavior caused by the rotation of subgrains takes place. Forforecasting the deformation stress of the studied steel, a physically-based constitutive model is constructed by combiningdislocation density theory and DRX kinetics. The reproduced deformation stresses well close to the measured data indicatesthat the developed physically-based constitutive model enjoys a preferred prediction ability to forecast the high-temperaturedeformation behaviors for the studied steel.

#Ultrahigh strength steel #Microstructure evolution #Dynamic recrystallization #Constitutive model #Hightemperature deformation characteristic

참고문헌 (82)

참고문헌 신청

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