Abstract
We studied the relationship between phase transformation and mechanical property of electron beam welded dissimilar titanium (Ti) alloy between Ti–10V–2Fe–3Al (Ti1023) and Ti–6Al–4V (Ti64). A new chemical composition in the fusion zone generated a moderately high beta (β) phase stability which made the precipitation of acicular alpha double-prime martensite, resulting in enhanced hardness. Fracture took place during tensile test in the heat affected zone (HAZ) of Ti1023 because secondary alpha (αs) phase transformed into β during welding, resulting in a loss of strength during welding. Post weld heat treatment (PWHT) successfully regained αs and improved the mechanical properties in Ti1023 HAZ, resulting in preventing failure at Ti1023 HAZ but occurring at Ti64 base during tensile test. A development of tri-modal structure, consisting of a globular and lamellar structure of primary alpha and fine αs precipitation, in both Ti64 base and Ti64 HAZ occurred after PWHT. The tensile property was improved after PWHT showing tensile strength with 1065 MPa and 9% elongation.
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