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Effect of Bainitic Microstructure on Ballistic Performance of Armour Steel Weld Metal Using Developed High Ni-Coated Electrode

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Abstract

Welding of armour steel has gained significant importance during the past few years as recent civilian and military requirements demand weld metal properties matching with base metal having good ballistic performance along with high strength and toughness at − 40 °C as per specification. The challenge of armour steel welding therefore lies in controlling the weld metal composition which is strongly dependent on welding electrode/consumables, resulting in desired weld microstructure consisting of lower bainite along with retained austenite. The performance of butt-welded armour steel joints produced by the developed electrodes was evaluated using tensile testing, ballistic testing, impact toughness at room temperature and subzero temperature. Microstructures of weld metals are exclusively characterized by x-ray diffraction technique, scanning electron microscope and transmission electron microscopy with selected area diffraction pattern. Experimental results show that weld metal with relatively lower carbon, higher manganese and lower nickel content was attributed to lower bainite with film type of retained austenite may be considered as a most covetable microstructure for armour steel weld metal.

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Authors and Affiliations

  1. Forge Technology Department, National Institute of Foundry and Forge Technology (NIFFT), Ranchi, 834003, India

    A. K. Pramanick

  2. School of Mechanical Engineering, University of Ulsan, Ulsan, 44610, South Korea

    H. Das

  3. Defense Metallurgical Research Laboratory (DMRL), Hyderabad, 500 058, India

    G. M. Reddy

  4. National Metallurgical Laboratory (NML), Jamshedpur, 831007, India

    M. Ghosh

  5. Rukhmani Electrode Pvt. Ltd, Badu, Barasat, Kolkata, 700128, India

    S. Nandy

  6. Metallurgical and Material Engineering Department, Jadavpur University, Kolkata, 700032, India

    T. K. Pal

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  1. A. K. Pramanick
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  2. H. Das
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  3. G. M. Reddy
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  4. M. Ghosh
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  5. S. Nandy
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  6. T. K. Pal
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Correspondence to T. K. Pal.

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Pramanick, A.K., Das, H., Reddy, G.M. et al. Effect of Bainitic Microstructure on Ballistic Performance of Armour Steel Weld Metal Using Developed High Ni-Coated Electrode. J. of Materi Eng and Perform 27, 2110–2123 (2018). https://doi.org/10.1007/s11665-018-3272-3

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  • DOI: https://doi.org/10.1007/s11665-018-3272-3

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