Microstructure Evolution and Deformation Behavior of Metastable β-Titanium Alloy Ti55511 in Die Forging

亚稳态β钛合金Ti55511模锻过程中显微组织演变与变形行为

The effect of die forging on the microstructure evolution and deformation behavior of metastable β-titanium alloy Ti55511 was investigated by electron backscatter diffraction.Before die forging,the alloy Ti55511 was subjected to multi-pass forging to optimize the microstructural heterogeneity(texture)which can cause mechanical behavior anisotropy of titanium alloys.Results show that after die forging,Ti55511 components exhibit different microstructures and textures in different local areas.No<100>fiber texture is found in all areas with different degrees of deformation.Dynamic recrystallization occurs in the area where large strain occurs during the early stage of die forging.Basket-weave microstructure forms in most local areas.

采用电子背散射衍射法研究了模锻对亚稳态β钛合金Ti55511显微组织演变和变形行为的影响。在模锻之前,对Ti55511合金进行了多道次锻造,以优化钛合金织构导致的力学行为各向异性。结果表明,模锻后,Ti55511部件局部区域表现出不同的显微组织和织构。在所有变形区域都没有发现<100>纤维织构。动态回复再结晶发生在模锻早期承受大应变的区域,大多数局部区域形成了网篮组织。