Thermo mechanical and microstructural constituents of dissimilar S700MC-S960QC high-strength steel welded joints using overmatched filler wire

  • Authors

    • Francois Njock Bayock Department of Mechanical Engineering, ENSET Douala, University of Douala, P.O. Box: 1872, Douala, Cameroon
    • Marius Tony Kibong Laboratory of Technologies and Applied Sciences, University Institute of Technology, University of Douala, PO Box 8698 Douala, Cameroon
    • Sadrack Timba Department of Mechanical Engineering, ENSET Douala, University of Douala, P.O. Box: 1872, Douala, Cameroon
    • Nji Nelson Che Laboratory of Energy Materials Modelling and Methods, EDSPD, University of Douala, P.O. Box: 2701 Douala, Cameroon
    2022-01-17
    https://doi.org/10.14419/ijet.v11i1.31873
  • Dissimilar Welding, GMAW Process, Overmatched Filler Wire, Hardness Test, Microstructural Constituents, SEM Images, EDS Micrographs.

  • Abstract

    In this study, a mechanical and microstructural constituent of welded joints of dissimilar high-strength and ultra-high-strength steels (S700MC/S960QC) using overmatched filler wire was evaluated. Three different heat inputs (18 kJ/cm, 8 kJ/cm, and 10 kJ/cm) and overmatched filler wire were applied using the GMAW process. Micro-hardness measurement was conducted using Vickers hardness test, tensile test, and microstructural constituents by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were performed in this analysis. A dissimilar welded sample with a cooling time of 51s (18 kJ/cm) showed a substantial hardness reduction in the fine grain heat-affected zone (HAZ) of the S700MC steel side, which was between 220-240 HV5. The cause could be the increase of heat input but also the use of overmatched filler wire, which can be the result of an increase of ferrite to austenite formation in the HAZ. SEM/EDS results confirmed the increase of carbide clusters, and tempered Martensite in the CGHAZ of the S960QC side, and ferrite-bainite on the S700MC side. An increase in the presence of high carbide content and the formation of Ni, Mo, and Mn were observed on the S960QC side. The increase of carbide formation in the CGHAZ of both sides reduced the hardness and strength of the welded joints. The tensile test confirms the softening observed in the FGHAZ of the S700MC side, which caused the joint fracture on this side during the test.

     

     

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  • How to Cite

    Njock Bayock, F., Tony Kibong, M., Timba, S., & Nelson Che, N. (2022). Thermo mechanical and microstructural constituents of dissimilar S700MC-S960QC high-strength steel welded joints using overmatched filler wire. International Journal of Engineering & Technology, 11(1), 1-9. https://doi.org/10.14419/ijet.v11i1.31873

    Received date: 2021-12-01

    Accepted date: 2021-12-06

    Published date: 2022-01-17