(中国船舶重工集团公司 第七二五研究所，洛阳 471039)
摘 要: 结合力学性能测试和OM、SEM、EBSD分析，研究了Ti6321合金板材力学性能各向异性及其影响因素。结果表明：板坯组织类型对板材平面各向异性具有显著影响，等轴组织板坯和魏氏组织板坯制备的合金板材屈服强度、抗拉强度和冲击功均具有明显的平面各向异性，且等轴组织板坯制备板材的屈服强度、抗拉强度和冲击功平面各向异性指数高于魏氏组织板坯制备板材相应指数。不同板坯组织类型制备的热轧态板材，织构均主要为柱面织构({0002}⊥轧面)，织构的方向为c轴倾向于平行于TD方向排布；经(980 ℃, 80 min)热处理后板材织构主要为基面织构({0002}//轧面)，织构方向为c轴倾向于与ND平行。不同组织类型的板坯经相同的热变形和热处理，对应板材的金相组织、织构组分、再结晶程度和裂纹扩展路径存在明显的差异，这综合引起Ti6321合金板材力学性能的各向异性。
关键字: Ti6321合金；板坯组织；织构；各向异性
（Luoyang Ship Material Research Institute, Luoyang 471039, China）
Abstract:Anisotropy of mechanical properties and its influencing factors of Ti6321 alloy plate were studied by means of mechanical properties testing and OM, SEM and EBSD analysis. The results show that the microstructure type of slab has a significant effect on the planar anisotropy of the plate. The yield strength, tensile strength and impact energy of the alloy plates produced by equiaxed and widmanstatten structure slab have obvious planar anisotropy. Moreover, the planar anisotropy indexes of yield strength, tensile strength and impact energy of equiaxed structure slab are higher than those of widmanstatten structure slab. The texture of hot rolled plates produced by different slab structure types is mainly cylindrical texture ({0002}⊥rolling surface), and the direction of texture is c-axis which tends to be parallel to the direction of TD. After heat treatment at (980 ℃, 80 min), the texture of the plate is mainly basal texture ({0002}//rolling surface), and the direction of texture is c-axis, which tends to be parallel to ND. After the same heat deformation and heat treatment, there are obvious differences in the metallographic structure, texture composition, recrystallization degree and crack growth path of different structure types of slab, which results in the anisotropy of mechanical properties of Ti6321 alloy plate.
Key words: Ti6321 alloy; slab microstructure; texture; anisotropy
