Study on constitutive modeling and processing maps for hot deformation of medium carbon Cr–Ni–Mo alloyed steel. (15th January 2016)

• Record Type: Journal Article
• Authors: Zhang, Chi; Zhang, Liwen; Shen, Wenfei; Liu, Cuiru; Xia, Yingnan; Li, Ruiqin
• Is Part Of: Materials & design. Volume 90(2016)
• Page Start: 804
• Page End: 814
• Publication Date: 2016-01-15
• Subjects: Medium carbon steel -- Hot deformation behavior -- Constitutive modeling -- Processing map; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2015.11.036
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: The hot deformation behavior of medium carbon Cr–Ni–Mo alloyed steel 34CrNiMo was studied in the wide temperature range of 900–1150 °C and the strain rate of 0.002–5 s − 1 . The thermo-mechanical analysis using Thermo-Calc software indicates austenite is the main phase during hot compression, which has a high occurrence tendency of DRX because of low stacking fault energy of such a phase. Constitutive equations for flow stress were developed by using the work 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 °C & 0.01–0.2 s − 1 and 1100–1150 °C & 0.01–5 s − 1 . Graphical abstract: Highlights: The equilibrium phase diagram for the medium carbon Cr-Ni-Mo alloyed steel 34CrNiMo was calculated using Thermo-Calc. The high deformation behavior of medium carbon Cr-Ni-Mo alloyed steel was investigated. Constitutive modeling was developed by using work-hardening curve for WH-DRV period and Avrami equation for DRX period. The processing maps at different strains were constructed and the optimum hot working windows were concluded.