Effect of the Heat Input in the Transformation of Retained Austenite in Advanced Steels of Transformation Induced Plasticity (TRIP) Welded with Gas Metal Arc Welding

Abstract:

The effect of heat input on the transformation of retained austenite steels transformation induced plasticity (TRIP) was investigated in the heat affected zone (HAZ) of the Gas Metal Arc Welding GMAW process. The determination of retained austenite of the HAZ is important in optimizing the welding parameters when welding TRIP steels, because this will greatly influence the mechanical properties of the welding joint due to the transformation of residual austenite into martensite due to work hardening. Coupons were welded with high and low heat input for investigating the austenite transformation of the base metal due to heat applied by the welding process and was evaluated by optical microscopy and the method of X-Ray Diffraction (XRD). Data analyzed shows that the volume fraction of retained austenite in the HAZ increases with the heat input applied by the welding process, being greater as the heat input increase and decrease the cooling rate, this due to variation in the travel speed of the weld path.

• Periodical: Applied Mechanics and Materials (Volume 339)
• Pages: 700-705
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.339.700
• Online since: July 2013
• Authors: Victor Lopez, Arturo Reyes, Patricia Zambrano
• Keywords: Heat Input, Retained Austenite, TRIP, Welding

References

[1] Kapustka N, Conrardy C, Babu S., y Albright C., (2008), Effect of GMAW Process and Material Conditions on DP 780 and TRIP 780 Welds, American Welding Society and the Welding Research Council, p.135 – 148. USA

[2] Mei Zhang, Lin Li, Ren-Yu Fu, Ji-Cheng Zhang, Zi Wan, (2008), Weldability of low carbon transformation induced plasticity steel, Journal of Iron and Steel Research, International, Vol. 15(5), pp.61-65.

DOI: 10.1016/s1006-706x(08)60250-2

[3] LI Zhuang, LV Hui-sheng, F Shi-rong Continuous Cooling Transformation Behaviour of C-Si-Mn TRIP Steel. Proceedings of Sine Swedish Structural Materials Symposium 2007.

[4] Zhao L., Wibowo M.K., Hermans M.J.M., van Bohemen S.M.C. Sietsma J., (2009), Retention of austenite in the welded microstructure of a 0.16C-1.6Mn-1.5Si (Wt.%) TRIP steel, Journal of Materials Processing Technology 209, pp.5286-5292.

DOI: 10.1016/j.jmatprotec.2009.03.017

[5] Han Tae-Kyo, Park Sin Sang, Kang Chung-Yun, Woo In-Su, Lee Jong-Bong, (2005), CO2 laser welding Characteristics of 800 MPa class TRIP Steel, ISIJ International, Vol. 45 (2005), pp.60-65.

DOI: 10.2355/isijinternational.45.60

[6] Zhao, L., Van Dijk N.H., Brück E., Sietsma J., Van Der Zwaag S.,(2001). Magnetic and X ray diffraction measurements for the determination of retained austenite in TRIP steels.material Science and Engineering A313, pp.145-152.

DOI: 10.1016/s0921-5093(01)00965-0

[7] López V.H., Pérez G., Reyes A., López H.F., (2010), Effects of heat input in the mechanical integrity of the weld joints welded by GMAW and LBW process in transformation induced plasticity steel (TRIP) used in automotive industry, Soldagem and Inspeção, Vol. 15, No. 3, p.234 – 241, São Paulo, Brasil.

DOI: 10.1590/s0104-92242010000300010