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论文类型：期刊论文

发表时间：2016-01-15

发表刊物：MATERIALS & DESIGN

收录刊物：SCIE、EI

卷号：90

页面范围：804-814

ISSN号：0264-1275

关键字：Medium carbon steel; Hot deformation behavior; Constitutive modeling; Processing map

摘要：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.