Enhancement of ballistic capabilities of soft welds through hardfacing |
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| Affiliation: | 1. Laboratory of Tribology, Department of Mechanical Engineering, University of West Attica, 250 Thivon Avenue & P. Ralli, 122 44 Egaleo, Greece;2. Laboratory of Applied Physics, Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;1. Advanced Materials Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK;2. Rolls-Royce plc, UK |
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| Abstract: | An attempt has been made to improve the ballistic immunity of austenitic welds through a hardfacing technique by a shielded metal arc welding process. Welds with complete hardfacing shattered under ballistic impact. An overlay of hardfacing alloy over austenitic weld disintegrated due to extensive cracking in the hardfacing layer. Sandwiching of the hardfacing alloy weld between austenitic welds served the dual purpose of weld integrity and ballistic immunity due to the high hardness of hardfacing alloy and the energy absorbing capacity of austenitic weld deposit. However, for full ballistic immunity equivalent to the base metal a minimum thickness of hardfacing weld layer was found to be essential. The observed trends are explained on the basis of microstructural features and cracking behaviour in the hardfacing alloy. |
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