An attempt was made to understand the effect of welded microstructure on ballistic properties of Ti-6Al-4V alloy plates. Ti-6Al-4V filler metal was welded by Gas Tungsten Arc Welding (GTAW) on concave dips that were artificially ground on wrought Ti-6Al-4V alloy plates prior to welding. The depth of concave dips ranged up to 20% of the thickness of base plates. Ballistic testing was performed with the 20-mm fragment-simulating projectile (FSP) to obtain a V50 limit velocity, which is used for the evaluation of ballistic resistance. Testing was conducted with the weld metal positioned on the front of the plate (facing towards the projectile) and on the rear of the plate (facing away from the projectile). Welded plates exhibited lower V50 values compared with that of base plates by up to 12%. The degree of deterioration depended on the depth and the position of weld metals with respect to the projectile. Tested plates were subjected to metallographic observations on the cross-section of fractured areas. The results of the ballistic tests are discussed in conjunction with metallurgical factors and their fracture behaviors.
Effect of welded microstructure on ballistic properties of Ti-6Al-4V plates
1998
8 Seiten, 8 Quellen
Conference paper
English
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