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研究了跨相区等温锻造时不同变形量分配对TC18钛合金显微组织和力学性能的影响,讨论了跨相区锻造组织和性能之间的关系。结果表明:跨相区等温锻造锻件的显微组织与两相区变形量密切相关。两相区较小变形时,显微组织和单相区接近,晶界α明显,锻件力学性能和全β锻造没有太大差别;两相区较大变形时,锻件的显微组织趋于不均匀,片状α相和球状α相同时存在,锻件强度升高,塑性基本保持不变,断裂韧性较两相区较小变形时明显下降。
The effects of different deformation distributions on the microstructure and mechanical properties of TC18 titanium alloy during isothermal forging were studied. The relationship between the cross-sectional forging microstructure and properties was also discussed. The results show that the microstructure of isothermal forging cross-section is closely related to the deformation of two-phase zone. When the two-phase zone is small deformed, the microstructure is close to the single-phase zone and the grain boundary α is obvious. The mechanical properties of the forging are not much different from those of the full-β forging. When the deformation of the two-phase zone is large, the microstructure tends to be not The uniform α-phase and spherical α exist at the same time. The strength of the forging increases with the plasticity basically unchanged, and the fracture toughness decreases obviously when the deformation is smaller.