日本金属学会誌

J. Japan Inst. Metals, Vol. 59, No. 9 (1995),
pp. 933-938

Aging Enhancement in Weld Joint of Ti-15V-3Cr-3Sn-3Al Alloy

Yoshio Shirasuna, Akira Nozue and Tadatsune Okubo

Department of Mechanical Engineering, Faculty of Science and Technology, Sophia University, Tokyo

Abstract:

Weld joint is locally deformed plastically and simultaneously restored at a high temperature after welding, and subsequently cooled to room temperature. Its singular thermomechanical hysteresis of the weld joint may affect aging behavior. Ti-15V-3Cr-3Sn-3Al alloys have showed aging enhancement in the weld joint. In the present study, we clarify the aging enhancement mechansim of this alloy on the base of the thermomechanical processing. A distinctive microstructure has existed in the weld joint after the welding and the subsequent cooling. Fringe-type microstructures of plate and bulk configuration may be created by local plastic deformation due to thermal stress after welding and by freezing of a solute atom atmosphere in the vicinity of edge dislocation component on cooling. Its distinctive microstructures have promoted the aging because of preferential sites for α precipitation. From the present results, a thermomechanical treatment has been proposed to obtain a high strength of this alloy by more short aging time.


(Received April 19, 1995)

Keywords:

titanium alloy, welding, aging, microstructure, thermomechanical treatment


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