小尺寸T3/35CrMnSi钢异种材料惯性径向摩擦焊接头的特性

Characteristics of inertia radial friction welding joints of small size T3/35CrMnSi dissimilar metal materials

针对小尺寸异种金属材料惯性径向摩擦焊接存在的困难,采用扫描电镜(SEM)、能谱分析(EDS)、显微硬度和剪切强度等测试方法,研究小尺寸T3/35CrMnSi异种材料惯性径向摩擦焊接头的特征。结果表明:在接头过渡区出现塑性变形层、动态再结晶、元素扩散互溶,实现了界面的冶金结合;接头界面塑性变形层的厚度随着主轴转速、摩擦力、顶锻力的变化而变化;当厚度约为5μm时,界面结合质量最好;接头力学性能以及热影响区宽度的变化与塑性变形层、马氏体相变、材料物性有关;在主轴转速大于1800r/min、顶锻压力大于190MPa的情况下,接头不容易出现缺陷。

Based on the difficulty of inertia radial friction welding small size T3/35CrMnSi dissimilar metal materials, the characteristics of joints of T3/35CrMnSi were analyzed by SEM, EDS, microhardness test and shear strength test. The results show that plastic deformation layer, dynamic recrystallization, and diffusion and dissolution of elements occur in the joint transition region, achieving metallurgical bonding. The thickness of the plastic deformation layer changes with spindle speed, friction pressure, forging pressure; when the thickness is about 5 μm, the interface quality is the best. The joint mechanical properties and the width of heat affected zone are relative to the plastic deformation layer, martensitic transformation and material properties. In the case that the spindle speed is more than 1800 r/min, the forging pressure is more than 190 MPa, the welding joints are bonded successfully and have no local spot defects.