Mechanical and metallurgical properties of DP 1000 steel square butt welded joints with GMAW

  • Authors

    • Ianto Rocha Federal University of Rio Grande do Sul
    • Ivan Machado Federal University of Rio Grande do Sul
    • Cintia Mazzaferro Federal University of Rio Grande do Sul
    2014-12-24
    https://doi.org/10.14419/ijet.v4i1.3928
  • Welding, Dual Phase (DP 1000) Steel, Microstructures, Softening, Mechanical Properties.

  • Abstract

    In this work, Gas Metal Arc Welding (GMAW) was used to study the influence of heat input (i.e. cooling rate) on mechanical/metallurgical properties of square butt welded joints of DP 1000 sheets. The influence of filler metals of different strengths on the mechanical properties of joints was also tested. A significant decrease in hardness was observed in the Heat Affected Zone (HAZ) due to martensite tempering, in regions where peak temperature was close to isotherm AC1 (calculated in 735 oC for these steel); coincidently, fracture in every tensile test occurred in regions where martensite was tempered, even when a wire of less strength was used. It was noticed that the decrease in ultimate tensile and yield strength of base metal was inherent to welding. When minimum heat input was used, deterioration in mechanical properties was less pronounced, once degree of HAZ softening was smaller. Elongation of joints increased with increasing heat input.

  • References

    1. [1] Steel Market Development Institute, AHSS 101: The Evolving Use of Advanced High-Strength Steels for Automotive Applications, 2011.

      [2] R. Kuziak, R. Kawalla, S. Waengler, Advanced High Strength Steels for Automotive Industry, Achieves of civil and mechanical engineering, 8 (2), 2008, 103-117.

      [3] M. Askoy, A. Esin, Improving the Mechanical Properties of Structural Carbon Steel by Dual-Phase Heat Treatment. J. Mater. Eng., 10 (4), 1988, 281-287. http://dx.doi.org/10.1007/BF02834157.

      [4] S. Kou, Welding Metallurgy, 2nd ed., John Wiley & Sons, 2003, 393-405.

      [5] M. Xia, E. Biro, Z. Tian, N. Zhou, Effects of Heat Input and Martensite on HAZ Softening in Laser Welding of Dual Phase Steels, ISIJ International, 48 (6), 2008, 809-814. http://dx.doi.org/10.2355/isijinternational.48.809.

      [6] S. Panda, N. Sreenivasan, M. Kuntz, Y. Zhou, Numerical Simulations and Experimental Results of Tensile Test Behavior of Laser Butt Welded DP980 Steels, Journal of Engineering and Materials Technology, 130 (4), 2008, 041003-1 - 041003-9

      [7] V.H Hernandez, S. Nayak, Y. Zhou, Tempering of Martensite in Dual-Phase and Its Effects on Softening Behavior, Metallurgical and Materials Transactions A, 42A (Oct.), 2011, 3115-3129.

      [8] E. Biro, J. McDermid, J. Embury, Y. Zhou, Softening Kinetics in Subcrtitical Heat-Affected Zone of Dual-Phase Steel Welds, Metallurgical and Materials Transactions A, 41 (Sept.), 2010, 2348-2356.

      [9] Y. Granbom, Structure and mechanical properties of dual phase steels – An experimental and theorical analysis. Thesis (Doctoral) – Royal Institute of Technology, School of Industrial Engineering and Management, Material Science Engineering, Division of Mechanical Metallurgy, Stockholm, Sweden, 2010.

      [10] M. Calcagnotto, D. Ponge, D. Raabe, On the Effect of Manganese on Grain Size Stability and Hardenability of Ultrafine-Grained Ferrite/Martensite Dual-Phase Steels, Metallurgical and Materials Transactions A 43A (Jan.), 2012, 37-46.

      [11] ASTM Standard E562-11, Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count. Oct., ASTM International, West Conshohocken, PA, 2011.

      [12] ASTM Standard E384-11, Standard Test Method for Knoop and Vickers Hardness of Materials. Aug., ASTM International, West Conshohocken, PA, 2011.

      [13] ASTM Standard E8/E8M-13a, Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count. Aug., ASTM International, West Conshohocken, PA, 2013.

      [14] J. Trzaska, L.A. Dobrzánski, L.A., Modelling of CCT diagrams for engineering and constructional steels, Journal of Material Processing Technology, 192-193 (Oct.), 2007, 504-510. http://dx.doi.org/10.1016/j.jmatprotec.2007.04.099.

      [15] I.G Machado, Heat Conduction in Welding: Fundaments & Applications (in portuguese), 1a ed., Imprensa Livre Editora Ltda, 200, 28-31.

      [16] A. Sayed, S. Kheirandish, Effect of Tempering Temperature on the Microstructure and Mechanical Properties of Dual Phase Steels, Materials Science and Engineering A 532 (Jan.), 2012, 21-25. http://dx.doi.org/10.1016/j.msea.2011.10.056.

      [17] H. Svoboda, H. Lorusso, A. Burgue-o, Soldadura de Aceros Dual Phase en Chapa Fina: GMAW, PAW y RSW, Soldagem & Inspeção, 16 (2), 2011, 165-176. http://dx.doi.org/10.1590/S0104-92242011000200009.

  • Downloads

  • How to Cite

    Rocha, I., Machado, I., & Mazzaferro, C. (2014). Mechanical and metallurgical properties of DP 1000 steel square butt welded joints with GMAW. International Journal of Engineering & Technology, 4(1), 26-34. https://doi.org/10.14419/ijet.v4i1.3928

    Received date: 2014-11-24

    Accepted date: 2014-12-15

    Published date: 2014-12-24