亚稳态 β 钛合金Ti55511模锻过程中显微组织演变与变形行为

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

摘要:

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。

Abstract:

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.