钛合金等温锻后冷却方式对组织和力学性能的影响

本文通过等温锻压机对TB6钛合金进行等温锻造，锻造完成后锻坯采取水淬和空冷不同的冷却方式，冷却完成后水淬的锻坯进行时效处理，空冷的锻坯进行固溶时效处理。研究TB6钛合金等温锻后不同的固溶时效制度对钛合金组织和力学性能的影响。结果表明，TB6钛合金等温锻后水淬的α相尺寸小于等温锻后空冷的α相尺寸，水淬的钛合金β基体上无感生α相，空冷的钛合金β基体上有感生α相形成。水淬的钛合金经时效后析出的次生α相比空冷的钛合金经固溶时效后析出的次生α相更加混乱。TB6钛合金等温锻后水淬经时效的强度和塑性与等温锻后空冷经固溶时效的水平相当，但断裂韧度前者高于后者。

Effect of Cooling Method on Microstructure and Mechanical Properties of Titanium Alloy after Isothermal Forging

TB6 titanium alloy was isothermal forged by isothermal forging press in this paper, the forged billets were cooled by different ways that water quenching and air cooling. The forged billets by water-quenched were aged and the forged billets by air-cooled were solid solution and aged after cooled. The effects of different solid solution and aging systems on the microstructure and mechanical properties of TB6 titanium alloy after isothermal forged were studied. The results show that alpha phase size of TB6 titanium alloy by water-quenched after isothermal forged was smaller than that by air-cooled after isothermal forged, there was no induced alpha phase in beta base of titanium alloy by water-quenched and there was induced alpha phase in beta base of titanium alloy by air-cooled. The precipitated secondary alpha phase of titanium alloy by water-quenched after aged was more chaotic than that by air-cooled after solid solution and aged. After isothermal forged, the strength and plasticity of TB6 titanium alloy by water-quenched after aged were similar to that by air cooled after solid solution and aged, but the fracture toughness of the former was higher than that of the latter.