A Proposal for Bending Process of TRIP Steel Sheets Based on the Springback Behavior

Abstract:

TRIP steels, or Transformed Induced Plasticity steels, have excellent mechanical properties if compared with conventional steels. The highlighted characteristic of these steels is that they modify the microstructure with the deformation process as part of the austenite transforms to martensite, with the consequent change of the material properties. One of the main problems of TRIP steels is strong elastic recovery, or springback, after forming. In this work, the springback phenomenon is evaluated by bending tests and the influence of the variables involved in it is determined. Experimental bending forces do not agree with theoretical predictions that are proposed in the literature. In spite of the bending radius having been considered an influence factor in the process, this work demonstrates that the aforementioned factor has a minor influence, at least for TRIP 800. The factor found to affect material recovery the most was the bending angle.

• Periodical: Advanced Materials Research (Volume 498)
• Pages: 13-18
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.498.13
• Online since: April 2012
• Authors: F.J. Avellaneda, Valentín Miguel, Juana Coello, Alberto Martínez-Martínez, Antonio Calatayud
• Keywords: Formability, Sheet-Bending, Springback, TRIP

References

[1] P. Jacques: On the physics and mechanics of phase transformation in TRIP-assisted multiphase steel, (PhD Thesis, Universite´ Catholique de Louvain, Louvain-La-Neuve, BELGIUM 1998).

DOI: 10.1017/s0770451800081665

[2] E. Girault: Bainitic transformation in TRIP-assisted steels and its influence on mechanical properties, (PhD Thesis, Katholieke Universiteit Leuven, Leuven, BELGIUM 1999).

DOI: 10.3842/sigma.2023.020

[3] B. Ehrhardt, T. Berger, H. Hofmann and T.W. Schaumann: Steel Grips Vol. 2 (2004), pp.247-255.

[4] A.K. Lis and B. Gajda, in: Modeling of the DP and TRIP microstructure in the CMnAlSi automotive steel, Proc. 11th International Scientific Conference, CAM3S'2005", Gliwice – Zakopane (POLAND 2005).

[5] C. Hinsinger and V. Zwilling, in: Experimental and numerical approaches of springback of high performances steels drawn with U-shaped tools and an industrial side member tool, International Body Engineering Conference & Exhibition and Automotive & Transportation Technology Congress (Paris 2002).

DOI: 10.4271/2002-01-2099

[6] Worldautosteel: Advanced High Strength Steel (AHSS) application guidelines (International Iron & Steel Institute, Committee on Automotive Applications, 2005).

[7] J.C. Gelin, in: Shape and process parameters optimization for the accurate control of springback in sheet metal forming (Proc. International Conference on Sheet Metal Vol. 2, Netherlands, 1996).

[8] A.P. Karallis and M.C. Boyce: Int. J. Mech. Sci. Vol. 34 (1992), p.113.

[9] K. Lange and K. Pöhlandt: Handbook of metal forming (McGraw-Hill, New York 1985).

[10] Society of Manufacturing Engineers, D.B. Dallas and American Society of Tool and Manufacturing Engineers Handbook: A reference work for manufacturing Engineers (McGraw-Hill, 1st Ed., New York 1976).

[11] G. Sachs: Principles and methods of sheet-metal fabricating (Reinhold Pub, New York (USA), (1951).

[12] Z. Tekiner: J. Mater. Process. Technol. Vol. 145 (2004), pp.109-117.

[13] R. Koop: J. Mater. Process. Technol. Vol. 60 (1996), pp.1-9.

[14] T. Pepelnjak, G. Gantar and K. Kuzman: J. Mater. Process. Technol. Vol. 115 (2001), pp.122-126.

[15] C. Wang, G. Kinzel and T. Altan: J. Mater. Process. Technol. Vol. 39 (1993), pp.279-304.

[16] B.C. De Cooman: Curr. Op. Sol. St. Mat. Sci. Vol. 8 (2004), pp.285-303.

[17] L.J. de Vin: Computer aided process planning for the bending of sheet metal components, (Doctoral Dissertation, Enschede, The Netherlands 1994).

[18] D. Fei and P. Hodgson: Nucl. Eng. Des. Vol. 236 (2006), pp.1847-1851.

[19] F.J. Avellaneda, V. Miguel, J. Coello, A. Martínez and A. Calatayud, in: Springback Evaluation For TRIP 800 Steel Sheets By Simple Bending Tests (Proceedings of the 4th Manufacturing Engineering Society International Conference, Sep. 21-23, Cádiz - Spain.

DOI: 10.1063/1.4707560

[20] BM. Botros: ASME WA/PROD Vol. 17(67)(1967).