AerMet100焊丝焊接的30CrMnSiNi2A接头组织和力学性能研究

Study on Microstructure and Mechanical Properties of 30CrMnSiNi2A Joint Welded with AerMet100 Welding Wire

采用AerMet100焊丝对航空用超高强度钢30CrMnSiNi2A进行了焊接,对焊接接头的微观组织和力学性能进行了研究。结果表明,焊缝区域组织主要由粗大的柱状晶和枝晶或细小的等轴晶组成。靠近焊缝的热影响区的过热区为粗大的马氏体组织,随着距离焊缝距离的增大,热影响区的组织逐步转变为细小的马氏体和贝氏体的混合组织。焊接热影响区边缘的组织为回火索氏体。焊接接头的抗拉强度可达1200 MPa,伸长率大于5%,并且焊接接头试样的断裂位置在焊接热影响区的边缘。

The 30CrMnSiNi2A ultra-high strength steel for aviation was welded by using AerMet100 steel welding wire, and the microstructure and mechanical properties of the welded joint were studied. The results show that the microstructure of the weld zone is mainly composed of coarse columnar crystals, dendrite and fine equiaxed crystal. The microstructure of the overheated zone in the heat affected zone （HAZ） near the welding seam is coarse martensite. With the increase of distance from the welding seam, the microstructure of HAZ transforms to mixed structure of fine martensite and bainite. The microstructure of the edge of HAZ is tempered sorbite. The tensile strength of the welded joint can reach 1200 MPa and the elongation is more than 5%. The fracture position of the welded joint specimen is at the eldge of HAZ.