Abstract
The fracture toughness of weld fusion zones in a dilute, medium-strength alpha-beta TiAlMn alloy has been studied in relation to their microstructures. Welding was performed over a range of energy inputs using different techniques. The weldments were subjected to three different annealing treatments. It has been shown that the fracture toughness of all weld metals is greater than that of the parent material. The data also reveal that there is a further improvement in fracture toughness on postweld heat treatment. The results are discussed in terms of the structural changes occurring during welding and subsequent annealing.
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