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Ab Initio Study of Weldability of a High-Manganese Austenitic Twinning-Induced Plasticity (TWIP) Steel Microalloyed with Boron

Published online by Cambridge University Press:  01 March 2016

Humberto Hernández-Belmontes ,
Ignacio Mejía  and
Cuauhtémoc Maldonado
Humberto Hernández-Belmontes
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio “U-5”, Ciudad Universitaria, 58066–Morelia, Michoacán, México.
Ignacio Mejía*
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio “U-5”, Ciudad Universitaria, 58066–Morelia, Michoacán, México.
Cuauhtémoc Maldonado
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio “U-5”, Ciudad Universitaria, 58066–Morelia, Michoacán, México.
*
*E-mail address: imejia@umich.mx, monsches886@gmail.com
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Abstract

High-Mn Twinning-Induced Plasticity (TWIP) steels are advanced high-strength steels (AHSS) currently under development; they are fully austenitic and characterized by twinning as the predominant strengthening mechanism. TWIP steels have high strength and formability with an elongation up to 80%, which allows reduction in automotive components weight and fuel consumption. Since the targeted application field of TWIP steels is the automotive industry, steels need high mechanical performance with good weldability and excellent corrosion resistance. However, there is lack of information about the weldability behavior of these advanced steels. This research work aims to study the weldability of a new generation of high-Mn austenitic TWIP steels microalloyed with B. Weldability was examined using spot welds produced by Gas Tungsten Arc Welding. Microstructural changes were examined using light optical metallography. Segregation of elements in the weld joint was evaluated using point and elemental mapping chemical analysis by Scanning Electron Microscopy and Electron-Dispersive Spectroscopy; while the hardness properties were examined with Vickers microhardness testing (HV25). Experimental results show that the welded joint microstructure consists of austenitic dendritic grains in the fusion zone, and equiaxed grains in the heat affected zone. Notably, the boron microalloyed TWIP steel exhibited poor weldability, showing hot cracking. Additionally, the studied TWIP steels showed a high degree of segregation in the fusion zone; Mn and Si segregated into the interdendritic regions, while Al and C preferentially segregated in dendritic areas. Finally, the welded joints of the TWIP steels showed microhardness values lower than the base material. In general, the present TWIP steels have problems of weldability, which are corroborated with microstructural changes, elements segregation and microhardness loss.

Keywords

SteelWeldingB
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1812: Symposium 6B – Advanced Structural Materials—2015 , 2016 , pp. 35 - 40
Copyright
Copyright © Materials Research Society 2016 

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References

REFERENCES

Bouaziz, O., Allain, S., Scott, C.P., Cugy, P. and Barbier, D., Curr. Opin. Solid State Mater. Sci. 15, 141–168 (2011).CrossRefGoogle Scholar
Béal, C., Ph.D. Thesis, L'Institut National des Sciences Appliquées de Lyon, Lyon, France, 2011.Google Scholar
Grässell, O., Krüger, L., Frommeyer, G. and Meyerc, L.W., Int. J. Plast. 16, 1391–1409 (2000).CrossRefGoogle Scholar
Reyes-Calderon, F., Mejía, I., Boulaajaj, A. and Cabrera, J.M., Mater. Sci. Eng. A 560, 552–560 (2013).CrossRefGoogle Scholar
De Cooman, B.C., in Phase Transformations in Steels, Volume 2: Diffusionless Transformations, High Strength Steels, Modelling and Advanced Analytical Techniques, edited by Pereloma, E. and Edmonds, D.V. (Woodhead Publishing, 2012), pp. 295–331.CrossRefGoogle Scholar
Jaehong, Y., Lee, C., Kim, S., Park, Y. and Choi, J., in HMnS 2011, edited by Lee, Y.K. (Proc. of the 1st Int. Conf. on High Manganese Steels, Yonsei University, Seoul, Korea, 2011), pp. 1–8.Google Scholar
Roncery, L.M., Weber, S. and Theisen, W., Scripta Mater. 66, 997–1001 (2012).CrossRefGoogle Scholar
Mujica, L., Weber, S., Thomy, C. and Vollertsen, F., Sci. Technol. Weld. Joint 14, 517–522 (2009).CrossRefGoogle Scholar
Bleck, W. and Phiu-on, K., in Microstructure and Texture in Steels and Other Materials, edited by Haldar, A., Suwas, S. and Bhattacharjee, D., (Springer, 2009), pp. 145–162.CrossRefGoogle Scholar
Salas-Reyes, A.E., Mejía, I., Bedolla-Jacuinde, A., Boulaajaj, A., Calvo, J. and Cabrera, J.M., Mater. Sci. Eng. A 611, 77–89 (2014).CrossRefGoogle Scholar
Easterling, K., The weld metal, Introduction to the Physical Metallurgy of Welding, (Butterworth-Heinemann, 1992), pp. 55–125.CrossRefGoogle Scholar
Reyes-Calderon, F., Ph.D. Thesis, Departamento de Metalurgia Mecánica, Instituto de Investigaciones Metalúrgicas-UMSNH, Morelia, Michoacán, México, 2013.Google Scholar
Debroy, T. and David, S.A., Rev. Mod. Phys. 67, 85–112 (1995).CrossRefGoogle Scholar
Saha, D.C., Choi, C.Y., Han, S., Chin, K.G., Choi, I. and Park, Y.D., Steel Res. Int. 83, 352–357 (2012).CrossRefGoogle Scholar