(中國船舶重工集團公司 第七二五研究所，洛陽 471039)
摘 要: 結(jié)合力學性能測試和OM、SEM、EBSD分析，研究了Ti6321合金板材力學性能各向異性及其影響因素。結(jié)果表明：板坯組織類型對板材平面各向異性具有顯著影響，等軸組織板坯和魏氏組織板坯制備的合金板材屈服強度、抗拉強度和沖擊功均具有明顯的平面各向異性，且等軸組織板坯制備板材的屈服強度、抗拉強度和沖擊功平面各向異性指數(shù)高于魏氏組織板坯制備板材相應指數(shù)。不同板坯組織類型制備的熱軋態(tài)板材，織構均主要為柱面織構({0002}⊥軋面)，織構的方向為c軸傾向于平行于TD方向排布；經(jīng)(980 ℃, 80 min)熱處理后板材織構主要為基面織構({0002}//軋面)，織構方向為c軸傾向于與ND平行。不同組織類型的板坯經(jīng)相同的熱變形和熱處理，對應板材的金相組織、織構組分、再結(jié)晶程度和裂紋擴展路徑存在明顯的差異，這綜合引起Ti6321合金板材力學性能的各向異性。
關鍵字: Ti6321合金；板坯組織；織構；各向異性
（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
