Effect of Heat Treatment on Microstructure and Mechanical Properties of Low-Carbon TRIP Steel Tube

Abstract:

In this study, the effects of isothermal bainite treatment (IBT) holding time on the microstructure of transformation induced plasticity (TRIP) seamless steel tube were studied via optical microscopy, TEM and XRD. Its mechanical properties and hydroformability were evaluated by tensile test and flaring test, respectively. The results revealed that the volume fraction of retained austenite (RA) increased at first then decreased with IBT holding time for a particular set of intercritical annealing (IA) temperature, IA holding time and IBT temperature. It was also demonstrated that high tensile strength of 618MPa, total elongation of 35.5%, n-value of 0.23 and better hydroformability could be successfully produced in this TRIP steel tube at IA temperature of 800°C, holding for 10 min, and IBT of 410°C for 4 min holding time.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 290-293
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.290
• Online since: June 2010
• Authors: Zi Cheng Zhang, Fu Xian Zhu, Hong Shuang Di, Yan Mei Li, Kenichi Manabe
• Keywords: Cold Drawing, Hydroformability, Retained Austenite, Seamless Steel Tube, TRIP Steel

References

[1] F. Dohmann and Ch. Hartl: J Mater Process Tech Vol. 1-4 (1996), p.669.

[2] A.K. Srivastava, G. Jha, N. Gope and S.B. Singh: Mater. Charact. Vol. 57 (2006), p.127.

[3] S. Zaefferer, J. Ohlert and W. Bleck: Acta Mater. Vol. 5 (2004), p.2765.

[4] K. Sugimoto, N. Ushi, M. Kobayashi, S. Hashimoto: ISIJ Int. Vol. 12 (1992), p.1311.

[5] F.X. Zhu, Z.C. Zhang, L.Q. Chen, K. Manabe and J.L. Xue: Proc. International Cont. on TH (2009), p.62.

[6] K. Manabe and Y. Yoshida: Proc. International Cont. on TH (2007), p.39.

[7] I.B. Timokhina, P.D. Hodgson and E.V. Pereloma: Metall. Trans. A Vol. 35A (2004), p.2331.

[8] M. De Meyer, D. Vanderschueren, K. De Blauwe and B.C. De Cooman: 41st MWSP Conf. Proc., ISS (1999), p.483.