Fe-Simulation of Hot Continuous Rolling of 40Cr Alloy Steel Round Bar and Roll Pass Design

Abstract:

40Cr alloy steel is widely used in the mechanical manufacturing industry and the quality of its rolled round bar has a great consequence on the quality and useful time of the final mechanical parts. By analyzing the characteristics of thermal plasticity of 40Cr steel, the Hensel-Spittel flow stress model of 40Cr steel was established in this study. For the possible continuous rolling schedule of Φ80mm 40Cr steel from 200mm×200mm billet, the advanced technology of viscoplastic FEM by LARSTRAN/SHAPE was used to create 3-D thermo-mechanical coupled simulation models for 8-pass hot continuous rolling processes. From the rolling process simulation the stress, strain, temperature distribution and rolling force variation were obtained. The simulation results included the comparison of plastic deformation of round pass with curved side wall and round pass with straight-side wall as well as the cause of rolling defect (e.g. crack). Based on the numerical analysis the reliable roll pass sequence wa constructed, which was verified by actual tests.

• Periodical: Materials Science Forum (Volume 817)
• Pages: 426-432
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.817.426
• Online since: April 2015
• Authors: Hui Ping Hong, Yu Luan
• Keywords: Alloy Steel, Continuous Rolling, Fe-Simulation, Roll Pass Sequence

References

[1] Dong Changxing, Yu Dehe, Fang Kuanjun, et al., Causes of cracks in 40Cr round steel and solutions[J]. Laigang Science & Technology. 2(2010)72-74 (in Chinese).

[2] Zhou Fugong, Gao Jie, Technology development of 40Cr alloy round steel[J]. Metal World. 2(2006)27-29 (in Chinese).

[3] Wu Laizhi, Chen Jun, Zhang Hongbing, Dynamic recrystallization of austenite and grain refinement in 40Cr steel, Journal of Shanghai Jiaotong University. 42(2008) 786-790(in Chinese).

[4] M. Franzke, PEP Programmer's Environment for Pre-/Postprocessing – Handbuch zur Version 3. 30. Institut für Bildsame Formgebung, RWTH Aachen, (2001).

[5] M. Franzke，J. Gruber, G. Barton, PEP (Programmer's Environment for Pre-/Postprocessing) Benutzerhumdbuch zur Version 3. 62，Aachener Umformtechnik GmbH, (2008).

[6] Hong Huiping, Kang Yonglin, Finite element simulation for effect of initial rolling temperature on change of rolling dynamic structure of steel 42CrMo4, Special Steel. 32(2011)15-17 (in Chinese).

[7] Y.W. Wang, Y.L. Kang, D.H. Yuan, et al., Numerical simulation of round to oval rolling process, Acta Metallurgical Sinica (English Letters). 13(2000)428.

[8] R. Kopp, H. Wiegels, Einführung in die Umformtechnik, 2. Auflage, Verlag Mainz, Aachen, (1999).