钛钢爆炸焊接结合界面组织及力学性能不均匀性研究

Study on inhomogeneity of interface microstructure and mechanical properties in explosive welding of titanium-steel clad

针对爆炸焊接钛钢复合板,通过金相显微镜(OM)、电子显微镜(SEM/EDS)、超微载荷硬度仪、纳米压痕仪、电液伺服万能试验机等表征手段,研究复合板结合界面的层次、结构、硬度、弹性模量的不均匀性以及对平行和垂直爆轰方向含结合界面复合板试样的拉伸性能。结果表明,结合界面由钛覆板过渡到钢基板的层次分别为覆板侧组织变形区、局部熔化区和基板侧等轴细晶区、条状纤维区及扭转区构成。结合界面不均匀的组织结构造成硬度和弹性模量不均匀,漩涡处局部熔化区硬度最高(11.73 GPa);复合板抗拉强度介于基覆板之间,横向抗拉强度(578 GPa)优于纵向(472 GPa),钛钢复合板拉伸性能具有各向异性。

For explosive welded titanium steel clad plate,metallographic microscope(OM),electron microscope(SEM/EDS),ultrafine load hardness tester,nano indentation tester,electro-hydraulic servo universal testing machine and other characterization methods were used to study the inhomogeneity of the layer,structure,hardness and elastic modulus of the bonding interface of the clad plate and the tensile properties of the clad plate samples with bonding interface in parallel and vertical detonation directions.The results show that the layers of the bonding interface from titanium clad plate to steel substrate are composed of the structure deformation zone on clad plate side,local melting zone,equi-axed fine grain zone,strip fiber zone and torsion zone on the substrate side.The uneven structure composition of the bonding interface causes uneven hardness and elastic modulus.The hardness of the local melting zone at the vortex is the highest(11.73 GPa);the tensile strength of the clad plate is between the base clad plate,the transverse tensile strength(578 GPa)is better than the longitudinal strength(472 GPa),and the tensile properties of the titanium steel clad plate are anisotropic.