Welding in the World

, Volume 63, Issue 1, pp 161–166 | Cite as

Uniaxial compression properties of fusion zone martensite in resistance spot-weld for QP980 steel

  • Chunlei Fan
  • Bohan Ma
  • Danian ChenEmail author
  • Gaotao Deng
  • Huanran Wang
  • Dongfang Ma
Research Paper


The cross-sectional micrograph, microhardness profile, and microstructures of the resistance spot-weld (RSW) for QP980 steel are shown to reveal the effects of the content and tempering of the martensite in the fusion zone (FZ) and the heat-affected zone (HAZ) on the microhardness profile of the RSW. It is indicated that the transient peak temperature above the critical temperature during the welding thermal cycle induces the significant variations of material and mechanical properties in the FZ and HAZ. The quasi-static uniaxial compression stress-strain curve of the FZ martensite in the RSW for QP980 steel is obtained with digital image correlation (DIC) and compared with that of two micropillars of martensite phase in the base material (BM) of the RSW for QP980 steel which was given by Srivastava et al. It is attributed to the welding thermal cycle different from QP980 steel heat treatment that the flow stress of the FZ martensite in the RSW is higher than that of the martensite phase in the BM. The dynamic uniaxial compression experiments for the FZ martensite in the RSW for QP980 steel are performed on a modified split Hopkinson pressure bar (SHPB), in which the reflected and transmitted waves are improved. A dynamic compression constitutive equation is presented by analyzing the results of the quasi-static and dynamic uniaxial compression experiments. A Swift law for martensite phase is extended to high strain rates to describe the weak strain-rate dependence of the dynamic compression behaviors of the FZ martensite in the RSW for QP980 steel.


Resistance spot-weld Fusion zone Uniaxial compression Quasi-static and dynamic Constitutive equation 


Funding information

This study was financially supported by the National Nature Science Foundation of China under Grant No. 11372149.


  1. 1.
    Cahoon JR, Broughton WH, Kutzak AR (1971) The determination of yield strength from hardness measurements. Metall Trans 2(7):1979–1983Google Scholar
  2. 2.
    Choi KS, Liu WN, Sun X, Khaleel MA (2009) Microstructure- based constitutive modeling of TRIP steel: prediction of ductility and failure modes under different loading conditions. Acta Mater 57:2592–2604CrossRefGoogle Scholar
  3. 3.
    Delannay L, Jacques P, Pardoen T (2008) Modelling of the plastic flow of trip-aided multiphase steel based on an incremental mean-field approach. Int J Solids Struct 45:1825–1843CrossRefGoogle Scholar
  4. 4.
    Fan CL, Ma BH, Chen DN, Wang HR, Ma DF (2016) Spall strength of resistance spot weld for QP steel. Chin Phys Lett 33:036201-036201-5Google Scholar
  5. 5.
    Hernandez VHB, Panda SK, Kuntz ML, Zhou Y (2010) Nanoindentation and microstructure analysis of resistance spot welded dual phase steel. Materials Let 64:207–210CrossRefGoogle Scholar
  6. 6.
    Kariem MA, Beynon JH, Ruan D (2012) Misalignment effect in the split Hopkinson pressure bar technique. Int J Impact Eng 47:60–70CrossRefGoogle Scholar
  7. 7.
    Ma BH, Fan CL, Chen DN, Wang HR, Zhou FH (2014) An investigation of the dynamic separation of spot welds under plane tensile pulses. J Appl Phys 116:053503-053503-9Google Scholar
  8. 8.
    Marya M, Wang K, Hector LG, Gayden X (2006) Tensile-shear forces and fracture modes in single and multiple weld specimens in dual-phase steels. J Manuf Sci Technol 128:287–298Google Scholar
  9. 9.
    Panda SK, Sreenivassan N, Kuntz ML, Zhou Y (2008) Numerical simulations and experimental results of tensile test behavior of laser butt welded DP980 steels. J Eng Mater Tech 130:531–534CrossRefGoogle Scholar
  10. 10.
    Pickering FB (1981) Physical metallurgy and design of steelsGoogle Scholar
  11. 11.
    Rauch GC, Leslie WC (1972) The extent and nature of the strength-differential effect in steels. Metall Trans 3:377–389CrossRefGoogle Scholar
  12. 12.
    Srivastava A, Ghassemi-Armaki H, Sung H, Chen P, Kumar S, Bower AF (2015) Micromechanics of plastic deformation and phase transformation in a three-phase TRIP-assisted advanced high strength steel: experiments and modeling. J Mech Phys Solids 78:46–69CrossRefGoogle Scholar
  13. 13.
    Tong W, Tao H, Jiang X, Zhang N, Marya MP (2005) Deformation and fracture of miniature tensile bars with resistance-spot-weld microstructures. Metall Mater Trans A 36:2651–2669CrossRefGoogle Scholar
  14. 14.
    Tomata Y, Umemoto M, Komatsubara N, Hiramatsu A, Nakajima N, Moriya A, Watanabe T, Nanba S, Anan G, Kunishige K, Higo Y, Miyahara M (1992) Prediction of mechanical properties of multi-phase steels based on stress-strain curves. ISIJ Int 32:343–349CrossRefGoogle Scholar
  15. 15.
    Wang L, Jin X, Qian H (2011) Recent development of galvanizing sheet steels in Baosteel. In proceedings of Galvatech 2011, Eight International Conference on zinc and Zinc Alloy Coated sheet steel, GenovaGoogle Scholar
  16. 16.
    Wang L, Speer JG (2013) Quenching and partitioning steel heat treatment. Metallogr Microstruct Anal 2:268–281CrossRefGoogle Scholar
  17. 17.
    Wang B, Duan QQ, Yao G, Pang JC, Li XW, Wang L, Zhang ZF (2014) Investigation on fatigue fracture behaviors of spot welded Q&P980 steel. Int J Fatigue 66:20–28CrossRefGoogle Scholar
  18. 18.
    Xia M, Biro E, Tian Z, Zhou Y (2008) Effects of heat input and martensite on HAZ softening in laser welding of dual phase steels. ISIJ Int 48:809–814CrossRefGoogle Scholar
  19. 19.
    Yang X, LGJr H, Wang J (2014) A combined theoretical/experimental approach for reducing ringing artifacts in low dynamic testing with servo-hydraulic load frames. Exp Mech 54:775–789CrossRefGoogle Scholar

Copyright information

© International Institute of Welding 2018

Authors and Affiliations

  • Chunlei Fan
    • 1
    • 2
  • Bohan Ma
    • 2
  • Danian Chen
    • 2
    Email author
  • Gaotao Deng
    • 2
  • Huanran Wang
    • 2
  • Dongfang Ma
    • 2
  1. 1.Zhejiang Industry Polytechnic CollegeShaoxingChina
  2. 2.Mechanics and Material Science Research CenterNingbo UniversityNingboChina

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