Titanium alloys have a tendency to bend down under their own weight at high temperatures during titanium machinging, thereby increasing the tendency of products to twist during forging, cooling, and heat treatment. The distortion is particularly obvious when the cross-section changes drastically, or the product is particularly thin, so The titanium alloy forgings must be shaped to meet the dimensional requirements.
Unlike aluminum alloys, titanium alloys are not easy to cold shape, because of their high yield strength and high elasticity coefficient, resulting in a large rebound, so the shape of titanium alloy forgings mainly rely on creep and hot shape correction, the former is more universal. The creep correction of most titanium alloys can be completed during the annealing and aging process, and the temperature is the annealing and aging temperature. However, if the annealing and aging temperature is lower than about 540 ~ 650 ℃, for different alloys, the time required to complete the creep correction may be extended.
Creep correction requires simple or complex fixtures and molds. The thermal correction in the die is mostly used for medium-sized forgings. The forgings are heated to the annealing or aging temperature for thermal correction, and then the stress is released below the thermal correction temperature.
Titanium Alloy Forging Cleaning Process