Journal
MATERIALS & DESIGN
Volume 90, Issue -, Pages 804-814Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.11.036
Keywords
Medium carbon steel; Hot deformation behavior; Constitutive modeling; Processing map
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Funding
- Fundamental Research Funds for the Central Universities of China
- Open Research Fund from the State Key Laboratory of Rolling and Automation, Northeastern University [2015003]
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The hot deformation behavior ofmediumcarbon Cr-Ni-Moalloyed steel 34CrNiMowas studied in thewide temperature range of 900-1150 degrees C and the strain rate of 0.002-5 s(-1). The thermo-mechanical analysis using Thermo-Calc software indicates austenite is themain phase during hot compression, which has a high occurrence tendency of DRX because of lowstacking fault energy of such a phase. Constitutive equations for flowstresswere developed by using thework hardening curve for the work hardening and dynamic recovery period and Avrami equation for the dynamic recrystallization period. All the factors in the equations can be illustrated in terms of Zener-Hollomon parameter. Besides, processing maps based on dynamic material model at the strains of 0.2, 0.4, 0.6, 0.8 and 1.0 were established. The concluded optimum hot working parameters are at 950-1100 degrees C & 0.01-0.2 s(-1) and 1100-1150 degrees C & 0.01-5 s(-1). (C) 2015 Elsevier Ltd. All rights reserved.
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