摘要
采用力学万能试验机、扫描电镜等分析测试手段研究80 mm厚宽幅7B50-T7751板材不同宽度、不同厚度位置的组织与性能均匀性,并与7050-T7451板材疲劳性能进行对比与讨论。结果表明:宽幅7B50-T7751厚板力学性能优异,在L和LT方向上,1/2厚度的拉伸屈服强度分别达到568 MPa和545 MPa,抗拉强度分别达到612 MPa和591 MPa,压缩屈服强度分别达到575 MPa和587 MPa,L-T向与T-L向的断裂韧度达到30.16 MPa·m^(1/2)和26.47 MPa·m^(1/2)。宽幅厚板在不同宽度位置存在一定的各向异性,LT方向上的性能均匀性优于L方向。1/4厚度不同宽度位置性能无明显差异,1/2厚度宽度边缘位置性能优于宽度中心位置。1/4厚度未形成明显强织构,在1/2厚度宽度中心的主要织构为S织构和Brass织构,边缘的主要织构为R织构、S织构和Brass织构。在应力比为0.06时,宽幅7B50-T7751厚板的T-L向抗疲劳裂纹扩展速率性能优于同厚度7050-T7451板材,LT向光滑试样(Kt=1)的疲劳极限低于7050-T7451板材约7.6%,缺口试样(Kt=3)的疲劳极限高于7050-T7451板材约3.7%。
The microstructure and performance homogeneity of 80 mm thick ultra-wide 7B50-T7751 plate with different widths and thicknesses were studied by means of mechanical testing machine and scanning electron microscope,and the fatigue properties were compared and discussed with 7050-T7451 plate.The results show that the ultra-wide 7B50-T7751 plate has excellent mechanical properties.In L and LT directions,the tensile yield strength of 1/2 thickness reaches up to 568 MPa and 545 MPa,and the tensile strength reaches up to 612 MPa and 591 MPa,the compressive yield strength reaches up to 575 MPa and 587 MPa,the fracture toughness in L-T direction and T-L direction reaches 30.16 MPa·m^(1/2) and 26.47 MPa·m^(1/2),respectively.The ultra-wide thick plate exhibits certain anisotropy at different width positions,the performance homogeneity in LT direction tends to be better than in L direction.Performance at different width positions with 1/4 thickness shows little difference,while the performance at the edge of 1/2 thickness is better than that of the center.No obvious texture exhibits at 1/4 thickness,however,the main textures at the center of 1/2 thickness are S texture and Brass texture,and the main textures at the edge are R texture,S texture and Brass texture.When the stress ratio is 0.06,the T-L anti-fatigue crack growth rate performance of ultra-wide 7B50-T7751 thick plate is better than 7050-T7451 plate with the same thickness.The fatigue limit of LT smooth sample(Kt=1)is about 7.6% inferior than that of 7050-T7451 plate,while the fatigue limit of notch sample(Kt=3)is about 3.7% higher.
作者
雷越
郝敏
陈高红
伊琳娜
臧金鑫
LEI Yue;HAO Min;CHEN Gaohong;YI Linna;ZANG Jinxin(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications,Beijing 100095,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2023年第11期103-110,共8页
Journal of Materials Engineering
