Microstructure and Strain Rate-Dependent Tensile Deformation Behavior of Fiber Laser-Welded Butt Joints of Dual-Phase Steels

  • Yang Liu
  • Danyang Dong
  • Zhiqiang Han
  • Zhibin Yang
  • Lu Wang
  • Qingwei Dong


The microstructure and tensile deformation behavior of the fiber laser-welded similar and dissimilar dual-phase (DP) steel joints over a wide range of strain rates from 10−3 to 103 s−1 were investigated for the further applications on the lightweight design of vehicles. The high strain rate dynamic tensile deformation process and full-field strain distribution of the base metals and welded joints were examined using the digital image correlation method and high-speed photography. The strain rate effects on the stress–strain responses, tensile properties, deformation, and fracture behavior of the investigated materials were analyzed. The yield stress (YS) and ultimate tensile strength (UTS) of the dissimilar DP780/DP980 welded joints were lying in-between those of the DP780 and DP980 base metals, and all materials exhibited positive strain rate dependence on the YS and UTS. Owing to the microstructure heterogeneity, the welded joints showed relatively lower ductility in terms of total elongation (TE) than those of the corresponding base metals. The strain localization started before the maximum load was reached, and the strain localization occurred earlier during the whole deformation process with increasing strain rate. As for the dissimilar welded joint, the strain localization tended to occur in the vicinity of the lowest hardness value across the welded joint, which was in the subcritical HAZ at the DP780 side. As the strain rate increased, the typical ductile failure characteristic of the investigated materials did not change.


digital image correlation (DIC) dual-phase (DP) steel fiber laser welding microstructure strain rate tensile deformation behavior 



This work was supported by the National Natural Science Foundation of China (Grant Nos. 51571052 and 51101029) and the Natural Science Fund of Liaoning Province (Grant Nos. 2014020034 and 20170540322).


  1. 1.
    W.L. Sun, X.K. Chen, and L. Wang, Analysis of Energy Saving and Emission Reduction of Vehicles Using Light Weight Materials, Energy Procedia, 2016, 88, p 889–893CrossRefGoogle Scholar
  2. 2.
    H.J. Kim, G.A. Keoleian, and S.J. Skerlos, Economic Assessment of Greenhouse Gas Emissions Reduction by Vehicle Lightweighting Using Aluminum and High-Strength Steel, J. Ind. Ecol., 2011, 15, p 64–80CrossRefGoogle Scholar
  3. 3.
    D.K. Matlock and J.G. Speer, Third Generation of AHSS: Microstructure Design Concepts, Microstructure and Texture in Steels and Other Materials, A. Haldar, S. Suwas, and D. Bhattacharjee, Ed., Springer, London, 2009, p 185–205Google Scholar
  4. 4.
    M.S. Rashid, Dual Phase Steels, Ann. Rev. Mater. Sci., 1981, 11, p 245–266CrossRefGoogle Scholar
  5. 5.
    A. Chabok, E. Van der Aa, J.T.M. De Hosson, and Y.T. Pei, Mechanical Behavior and Failure Mechanism of Resistance Spot Welded DP1000 Dual Phase Steel, Mater. Des., 2017, 124, p 171–182CrossRefGoogle Scholar
  6. 6.
    M. Tumuluru, Resistance Spot Welding Techniques for Advanced High-Strength Steels (AHSS), Welding and Joining of Advanced High Strength Steels (AHSS), M. Shome and M. Tumuluru, Ed., Woodhead Publishing, Cambridge, 2015, p 55–70CrossRefGoogle Scholar
  7. 7.
    K. Májlinger, E. Kalácska, and P. Russo, Spena, Gas Metal Arc Welding of Dissimilar AHSS Sheets, Mater. Des., 2016, 109, p 615–621CrossRefGoogle Scholar
  8. 8.
    F. Varol, E. Ferik, U. Ozsaraz, and S. Aslanlar, Influence of Current Intensity and Heat Input in Metal Inert Gas-brazed Joints of TRIP 800 Thin Zinc Coated Steel Plates, Mater. Des., 2013, 52, p 1099–1105CrossRefGoogle Scholar
  9. 9.
    M.I. Khan, M.L. Kuntz, P. Su, A. Gerlich, T. North, and Y. Zhou, Resistance and Friction Stir Spot Welding of DP600: A Comparative Study, Sci. Technol. Weld. Join., 2007, 12, p 175–182CrossRefGoogle Scholar
  10. 10.
    S. Chatterjee and T. van der Veldt, Hybrid Welding Processes in Advanced High-Strength Steels (AHSS), Welding and Joining of Advanced High Strength Steels (AHSS), M. Shome and M. Tumuluru, Ed., Woodhead Publishing, Cambridge, 2015, p 121–136CrossRefGoogle Scholar
  11. 11.
    M. Merklein, M. Johannes, M. Lechner, and A. Kuppert, A Review on Tailored blanks-Production, Applications and Evaluation, J. Mater. Process. Technol., 2014, 214, p 151–164CrossRefGoogle Scholar
  12. 12.
    B.L. Kinsey and X. Wu, Preface, Tailor Welded Blanks for Advanced Manufacturing, B.L. Kinsey and X. Wu, Ed., Woodhead Publishing, Cambridge, 2011, p xi–xiiCrossRefGoogle Scholar
  13. 13.
    S.S. Nayak, E. Biro, and Y. Zhou, Laser Welding of Advanced High-Strength Steels (AHSS), Welding and Joining of Advanced High Strength Steels (AHSS), M. Shome and M. Tumuluru, Ed., Woodhead Publishing, Cambridge, 2015, p 71–92CrossRefGoogle Scholar
  14. 14.
    A.S. Khan, M. Baig, S.H. Choi, H.S. Yang, and X. Sun, Quasi-Static and Dynamic Responses of Advanced High Strength Steels: Experiments and Modeling, Int. J. Plast, 2012, 30–31, p 1–17Google Scholar
  15. 15.
    Y. Cao, B. Karlsson, and J. Ahlström, Temperature and Strain Rate Effects on the Mechanical Behavior of Dual Phase Steel, Mater. Sci. Eng., A, 2015, 636, p 124–132CrossRefGoogle Scholar
  16. 16.
    J.G. Qin, Y.L. Lin, F.Y. Lu, R. Chen, and M.Z. Liang, in Dynamic Tensile Testing of Based and Welded Automotive Steel, Dynamic Behavior of Materials, ed. by B. Song, D. Casem, J. Kimberley. Proceedings of the 2013 Annual Conference on Experimental and Applied Mechanics, June 3–5, 2013, (Lombard), (Springer, Cham, 2014), Vol 1, pp. 489–496Google Scholar
  17. 17.
    J.H. Kim, D. Kim, H.N. Han, F. Barlat, and M.G. Lee, Strain Rate Dependent Tensile Behavior of Advanced High Strength Steels: Experiment and Constitutive Modeling, Mater. Sci. Eng., A, 2013, 559, p 222–231CrossRefGoogle Scholar
  18. 18.
    H. Huh, S.B. Kim, J.H. Song, and J.H. Lim, Dynamic Tensile Characteristics of TRIP-Type and DP-Type Steel Sheets for an Auto-Body, Int. J. Mech. Sci., 2008, 50, p 918–931CrossRefGoogle Scholar
  19. 19.
    B.L. Boyce and M.F. Dilmore, The Dynamic Tensile Behavior of Tough, Ultrahigh-Strength Steels at Strain-Rates from 0.0002 s−1 to 200 s−1, Int. J. Impact Eng, 2009, 36, p 263–271CrossRefGoogle Scholar
  20. 20.
    W.R. Wang, M. Li, C.W. He, X.C. Wei, D.Z. Wang, and H.B. Du, Experimental Study on High Strain Rate Behavior of High Strength 600–1000 MPa Dual Phase Steels and 1200 MPa Fully Martensite Steels, Mater. Des., 2013, 47, p 510–521CrossRefGoogle Scholar
  21. 21.
    S. Curtze, V.T. Kuokkala, M. Hokka, and P. Peura, Deformation Behavior of TRIP and DP Steels in Tension at Different Temperatures over a Wide Range of Strain Rate, Mater. Sci. Eng., A, 2009, 507, p 124–131CrossRefGoogle Scholar
  22. 22.
    J.F. Wang, L.J. Yang, M.S. Sun, T. Liu, and H. Li, A Study of the Softening Mechanisms of Laser-Welded DP1000 Steel Butt Joints, Mater. Des., 2016, 97, p 118–125CrossRefGoogle Scholar
  23. 23.
    V.H. Baltazar Hernandez, S.S. Nayak, and Y. Zhou, Tempering of Martensite in Dual-Phase Steels and Its Effects on Softening Behavior, Metall. Mater. Trans. A, 2011, 42, p 3115–3129CrossRefGoogle Scholar
  24. 24.
    W. Meng, Z.G. Li, J. Huang, Y.X. Wu, and S. Katayama, Microstructure and Softening of Laser-welded 960 MPa Grade High Strength Steel Joints, J. Mater. Eng. Perform., 2014, 23, p 538–544CrossRefGoogle Scholar
  25. 25.
    A. Kouadri Henni, C. Seang, B. Malard, and V. Klosek, Residual Stresses Induced by Laser Welding Process in the Case of a Dual-Phase Steel DP600: Simulation and Experimental Approaches, Mater. Des., 2017, 123, p 89–102CrossRefGoogle Scholar
  26. 26.
    Q. Jia, W. Guo, P. Peng, M.G. Li, Y. Zhu, and G.S. Zou, Microstructure- and Strain Rate-Dependent Tensile Behavior of Fiber Laser-Welded DP980 Steel Joint, J. Mater. Eng. Perform., 2016, 25, p 668–676CrossRefGoogle Scholar
  27. 27.
    H.Y. Gong, S.F. Wang, P. Knysh, and Y.P. Korkolis, Experimental Investigation of the Mechanical Response of Laser-Welded Dissimilar Blanks from Advanced-and Ultra-High-Strength Steels, Mater. Des., 2016, 90, p 1115–1123CrossRefGoogle Scholar
  28. 28.
    N. Farabi, D.L. Chen, and Y. Zhou, Tensile Properties and Work Hardening Behavior of Laser-Welded Dual-phase Steel Joints, J. Mater. Eng. Perform., 2012, 12, p 222–230CrossRefGoogle Scholar
  29. 29.
    N. Farabi, D.L. Chen, J. Li, Y. Zhou, and S.J. Dong, Microstructure and Mechanical Properties of Laser Welded DP600 Steel Joints, Mater. Sci. Eng., A, 2010, 527, p 1215–1222CrossRefGoogle Scholar
  30. 30.
    N. Farabi, D.L. Chen, and Y. Zhou, Microstructure and Mechanical Properties of Laser Welded Dissimilar DP600/DP980 Dual-Phase Steel Joints, J. Alloys Compd., 2011, 509, p 982–989CrossRefGoogle Scholar
  31. 31.
    D. Parkes, D. Westerbaan, S.S. Nayak, Y. Zhou, F. Goodwin, S. Bhole, and D.L. Chen, Tensile Properties of Fiber Laser Welded Joints of High Strength Low Alloy and Dual-phase Steels at Warm and Low Temperatures, Mater. Des., 2014, 56, p 193–199CrossRefGoogle Scholar
  32. 32.
    U. Reisgen, M. Schleser, O. Mokrov, and E. Ahmed, Uni- and Bi-axial Deformation Behavior of Laser Welded Advanced High Strength Steel Sheets, J. Mater. Process. Technol., 2010, 210, p 2188–2196CrossRefGoogle Scholar
  33. 33.
    C.Y. Kang, T.K. Han, B.K. Lee, and J.K. Kim, Characteristics of Nd:YAG Laser Welded 600 MPa Grade TRIP and DP Steels, Mater. Sci. Forum, 2007, 539–543, p 3967–3972CrossRefGoogle Scholar
  34. 34.
    D.C. Saha, D. Westerbaan, S.S. Nayak, E. Biro, A.P. Gerlich, and Y. Zhou, Microstructure-Properties Correlation in Fiber Laser Welding of Dual-Phase and HSLA Steels, Mater. Sci. Eng., A, 2014, 607, p 445–453CrossRefGoogle Scholar
  35. 35.
    M. Hazratinezhad, N.B. Mostafa Arab, A.R. Sufizadeh, and M.J. Torkamany, Mechanical and Metallurgical Properties of Pulsed Neodymium-doped Yttrium Aluminum Garnet Laser Welding of Dual Phase Steel, Mater. Des., 2012, 33, p 83–87CrossRefGoogle Scholar
  36. 36.
    J. Li, S.S. Nayak, E. Biro, S.K. Panda, F. Goodwin, and Y. Zhou, Effects of Weld Line Position and Geometry on the Formability of Laser Welded High Strength Low Alloy and Dual-phase Steel Blanks, Mater. Des., 2013, 52, p 757–766CrossRefGoogle Scholar
  37. 37.
    N. Sreenivasan, M. Xia, S. Lawson, and Y. Zhou, Effect of Laser Welding on Formability of DP980 Steel, J. Eng. Mater. Technol., 2008, 130, p 0410041–0410049CrossRefGoogle Scholar
  38. 38.
    S.K. Panda, V.H. Baltazar Hernandez, M.L. Kuntz, and Y. Zhou, Formability Analysis of Diode Laser-welded Tailored Blanks of Advanced High-Strength Steel Sheets, Metall. Mater. Trans. A, 2009, 40, p 1955–1967CrossRefGoogle Scholar
  39. 39.
    M. Xia, N. Sreenivasan, S. Lawson, Y. Zhou, and Z. Tian, A Comparative Study of Formability of Diode Laser Welds in DP980 and HSLA Steels, J. Eng. Mater. Technol., 2007, 129, p 446–452CrossRefGoogle Scholar
  40. 40.
    M.S. Xia, M.L. Kuntz, Z.L. Tian, and Y. Zhou, Failure Study on Laser Welds of Dual Phase Steel in Formability Test, Sci. Technol. Weld. Joi., 2008, 13, p 378–387Google Scholar
  41. 41.
    D. Anand, D.L. Chen, S.D. Bhole, P. Andreychuk, and G. Boudreau, Fatigue Behavior of Tailor (Laser)-Welded Blanks for Automotive Applications, Mater. Sci. Eng., A, 2006, 420, p 199–207CrossRefGoogle Scholar
  42. 42.
    W. Xu, D. Westerbaan, S.S. Nayak, D.L. Chen, F. Goodwin, and Y. Zhou, Tensile and Fatigue Properties of Fiber Laser Welded High Strength Low Alloy and DP980 Dual-Phase Steel Joints, Mater. Des., 2013, 43, p 373–383CrossRefGoogle Scholar
  43. 43.
    D. Parkes, W. Xu, D. Westerbaan, S.S. Nayak, D.L. Chen, F. Goodwin, S. Bhole, and D.L. Chen, Microstructure and Fatigue Properties of Fiber Laser Welded Dissimilar Joints Between High Strength Low Alloy and Dual Phase Steels, Mater. Des., 2013, 51, p 665–675CrossRefGoogle Scholar
  44. 44.
    J.W. Sowards, E.A. Pfeif, M.J. Connolly, J.D. McColskey, S.L. Miller, B.J. Simonds, and J.R. Fekete, Low-cycle Fatigue Behavior of Fiber-laser Welded, Corrosion-resistant, High-strength Low Alloy Sheet Steel, Mater. Des., 2017, 121, p 393–405CrossRefGoogle Scholar
  45. 45.
    D.Y. Dong, Y. Liu, Y.L. Yang, J.F. Li, M. Ma, and T. Jiang, Microstructure and Dynamic Tensile Behavior of DP600 Dual Phase Steel Joint by Laser Welding, Mater. Sci. Eng., A, 2014, 594, p 17–25CrossRefGoogle Scholar
  46. 46.
    D.Y. Dong, Y. Liu, L. Wang, Y.L. Yang, J.F. Li, and M.M. Jin, Effect of Strain Rate on Dynamic Deformation Behavior of Laser Welded DP780 Steel Joints, Acta Metall. Sin., 2013, 49, p 1493–1500CrossRefGoogle Scholar
  47. 47.
    D.Y. Dong, Y. Liu, L. Wang, and L.J. Su, Effect of Strain Rate on Dynamic Deformation Behavior of DP780 Steel, Acta Metall. Sin., 2013, 49, p 159–166CrossRefGoogle Scholar
  48. 48.
    L. Yang, D.Y. Dong, L. Wang, X. Chu, P.F. Wang, and M.M. Jin, Strain Rate Dependent Deformation and Failure Behavior of Laser Welded DP780 Steel Joint Under Dynamic Tensile Loading, Mater. Sci. Eng., A, 2015, 627, p 296–305CrossRefGoogle Scholar
  49. 49.
    D.Y. Dong, Y. Liu, L. Wang, Y.L. Yang, D. Jiang, R.C. Yang, and W.L.H. Zhang, Microstructure and Deformation Behavior of Laser Welded Dissimilar Dual Phase Steel Joints, Sci. Technol. Weld. Joi., 2016, 21, p 75–82CrossRefGoogle Scholar
  50. 50.
    E. Biro, J.R. McDermid, J.D. Embury, and Y. Zhou, Softening Kinetics in the Subcritical Heat-Affected Zone of Dual-Phase Steel Welds, Metall. Mater. Trans. A, 2010, 41, p 2348–2356CrossRefGoogle Scholar
  51. 51.
    H. Lee, C. Kim, and J.H. Song, An Evaluation of Global and Local Tensile Properties of Friction-stir Welded DP980 Dual-phase Steel Joints Using a Digital Image Correlation Method, Materials, 2015, 8, p 8424–8436CrossRefGoogle Scholar
  52. 52.
    K. Sato, Q. Yu, J. Hiramoto, T. Urabe, and A. Yoshitake, A Method to Investigate Strain Rate Effects on Necking and Fracture Behaviors of Advanced High-strength Steels Using Digital Imaging Strain Analysis, Int. J. Impact Eng, 2015, 75, p 11–26CrossRefGoogle Scholar
  53. 53.
    J.G. Qin, R. Chen, X.J. Wen, Y.L. Lin, M.Z. Liang, and F.Y. Lu, Mechanical Behavior of Dual-Phase High-strength Steel Under High Strain Rate Tensile Loading, Mater. Sci. Eng., A, 2013, 586, p 62–70CrossRefGoogle Scholar
  54. 54.
    G.B. Broggiato, L. Cortese, F. Nalli, and P.R. Spena, Full Field Strain Measurement of Dissimilar Laser Welded Joints, Procedia Eng., 2015, 109, p 356–363CrossRefGoogle Scholar
  55. 55.
    R.R. Ambriz, C. Froustey, and G. Mesmacque, Determination of the Tensile Behavior at Middle Strain Rate of AA6061-T6 Aluminum Alloy Welds, Int. J. Impact Eng, 2013, 60, p 107–119CrossRefGoogle Scholar

Copyright information

© ASM International 2018

Authors and Affiliations

  • Yang Liu
    • 1
  • Danyang Dong
    • 2
  • Zhiqiang Han
    • 1
  • Zhibin Yang
    • 3
  • Lu Wang
    • 2
  • Qingwei Dong
    • 1
  1. 1.School of Materials Science and EngineeringNortheastern UniversityShenyangChina
  2. 2.College of ScienceNortheastern UniversityShenyangChina
  3. 3.School of Materials Science and EngineeringDalian Jiaotong UniversityDalianChina

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