退火对SP-700合金板材组织、织构和力学性能各向异性的影响  

Effects of annealing on structure,texture and mechanical properties of SP-700 alloy sheets

作　　者：赵天章[1] 杨震 王珏[2] 韩颖杰[2] 付和国 庾雅集 ZHAO Tianzhang;YANG Zhen;WANG Jue;HAN Yingjie;FU Heguo;YU Yaji(College of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China;Industry Group Co.,Ltd.,Shenyang 110034,China)

机构地区：[1]沈阳航空航天大学航空宇航学院,沈阳110136 [2]沈阳飞机工业(集团)有限公司,沈阳110034

出　　处：《中国有色金属学报》2024年第3期797-811,共15页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51605310);辽宁省教育厅资助项目(LJKZ0180);辽宁省中青年创新计划项目(RC210422)。

摘　　要：通过光学显微镜(OM)、电子背散衍射(EBSD)及单向拉伸测试等方法,研究了退火温度对SP-700合金板材微观组织、织构和力学性能各向异性的影响。结果表明:随退火温度的升高,SP-700合金板材的晶粒等轴化程度提高;当退火温度为780℃时,退火织构类型基本不变;当退火温度为860℃时,初生α相向次生α相的转变形成了新的织构;经900℃退火后,组织类型转变为网篮组织,织构类型为棱锥织构和R型织构。α相的棱锥织构取向是造成原始板材力学性能各向异性的原因;晶内亚结构在变形初期对滑移系的阻碍作用影响了板材在不同方向上的室温强度;随退火温度的升高,晶内亚结构的消除和新的织构取向的产生导致力学性能各向异性增强。此外,晶粒形貌和相含量的差异也会导致各向异性的变化。原始板材的断裂机制均为韧性断裂,且不同方向的断口特征略有不同。The effects of annealing temperature on the anisotropy of microstructure,texture and mechanical properties of SP-700 alloy sheet were studied using optical microscope(OM),electron backscatter diffraction(EBSD)and uniaxial tensile test.The results show that the grain equiaxed degree of the SP-700 alloy sheet increases with the increase of annealing temperature.The texture type of annealing at annealing temperature of 780℃is unchanged;when the annealing temperature is 860℃,the transformation of primaryαto secondaryαphase forms a new texture.After annealing at 900℃,the structure type changes to basket weave structure,and the texture type is pyramid texture and R-type texture.The pyramidal texture orientation ofαphase is the reason for the anisotropy of mechanical properties of the original sheet.The hindrance of the intracrystalline substructure to the slip system at the initial stage of deformation affects the room temperature strength in different directions of the sheet.With the increase of annealing temperature,the elimination of intracrystalline substructure and the generation of new texture orientation lead to the enhancement of anisotropy of mechanical properties.Additionally,the differences in grain morphology and phase content can also lead to changes in anisotropy.The fracture mechanism of the original sheet is ductile fracture,and the fracture characteristics in different directions are slightly different.

关 键 词：退火 SP-700合金板材 微观组织 织构 力学性能 各向异性 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG156.1[金属学及工艺—金属材料]