SOME ENGINEERING ASPECTS OF THERMOHYDROGEN PROCESSING OF LARGE COMPLEX TITANIUM CASTINGS

摘要

Thermohydrogen processing is an effective method to improve the mechanical properties of titanium alloy castings. In this paper, some engineering aspects of thermohydrogen processing of large complex Ti alloy castings were discussed. From the point of engineering application, the effects of thermohydrogen processing were studied on the overall mechanical properties including room temperature tensile strength, 350℃ tensile strength, 350℃ durability, room temperature fatigue strength and fracture toughness. The feasibility of applying thermohydrogen processing to large thick-walled (up to 45mm wall thickness) titanium casting was also studied. Some real Ti alloy castings were tested using thermohydrogen processing. Our results showed that thermohydrogen processing was very suitable to heat treat the large complex titanium castings when high temperature durability and fatigue strength are desired or required.