Heat treatment method for obtaining high-toughness and high-damage-tolerance dual-phase titanium alloy
A heat treatment method and damage tolerance technology, applied in the field of titanium alloys, can solve the problems of difficulty in taking into account the strength and toughness and damage tolerance performance, the deterioration of titanium alloy toughness and damage tolerance performance, and the reduction of alloy strength, so as to improve the toughness. and damage tolerance performance, low fatigue crack growth rate, high fracture toughness effect
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Embodiment 1
[0017] The material of this embodiment is additively manufactured TC11 titanium alloy, the maximum thickness of which is 20mm, and its β transformation temperature T β The temperature is 1010°C, adopt the following high-temperature heat treatment process: 1007°C, heat preservation for 0.5 hours, and control the cooling rate at 20±5°C / s within the temperature range of cooling to 800°C. Additively manufactured TC11 titanium alloy material after treatment, room temperature strength R m 1070MPa; room temperature fracture toughness K IC 115MPa·m 1 / 2 , which is about 53% higher than that before treatment; the fatigue crack growth rate da / dN in the steady-state region is significantly lower than that before treatment, when Δ K =15 MPa·m 1 / 2 , da / dN decreased by about 53%.
Embodiment 2
[0019] The material of this embodiment is TC11 titanium alloy forging, its maximum thickness is 40mm, and its β transformation temperature T β The temperature is 1010°C, the original structure is forged two-state structure, and the following pretreatment process is adopted: at 1020°C, heat preservation for 1 hour, and the cooling rate is controlled at 150±20°C / s; then high-temperature heat treatment, high-temperature heat treatment process: 1007°C, heat preservation 0.5 Hours, the cooling rate is controlled at 20±5°C / sec in the temperature range of high temperature cooling to 800°C. After treatment, TC11 titanium alloy forgings, room temperature strength R m 1060MPa, room temperature fracture toughness K IC 105MPa·m 1 / 2 , which is about 38% higher than that before treatment; the fatigue crack growth rate da / dN in the steady-state region is significantly lower than that before treatment, when Δ K =15 MPa·m 1 / 2 , da / dN decreased by about 39%.
Embodiment 3
[0021] The material of this embodiment is TC4 titanium alloy casting, its maximum thickness is 18mm, and its β transformation temperature T β The temperature is 995°C, the original tissue is Widmanstatten tissue, and the following high-temperature heat treatment process is adopted: 992°C, heat preservation for 1 hour, and the cooling rate is controlled at 30±5°C / sec within the temperature range of high temperature cooling to 790°C. Treated TC4 casting, room temperature strength R m 905MPa, room temperature fracture toughness K IC 90.5MPa·m 1 / 2 , which is about 15% higher than that before treatment; the fatigue crack growth rate in the steady-state region is significantly lower than that before treatment, when Δ K =15 MPa·m 1 / 2 , da / dN decreased by about 28%.
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