电场对异种金属摩擦焊接头组织与性能的影响

Influence of electric field on the microstructure and mechanical property of the friction welding joint between T2 copper and stainless steel

研究了外加电场对T2紫铜和1Cr18Ni9Ti不锈钢摩擦焊接头焊合区的显微组织、主要合金元素的扩散区宽度以及接头力学性能的影响。结果表明,外加电场加快了焊合区金属的动态再结晶进程,不同形式的电场对焊合区铜侧的组织形态与分布有不同的影响。在负电场(试件接电源负极)作用下,焊合区金属发生的动态再结晶程度最大,晶粒尺寸较大且分布均匀;交流电场使晶粒尺寸略有减小。交流电场和负电场通过对金属内部电子密度的影响,促进了焊接过程中焊缝区Cu、Fe和Cr的扩散,并提高了焊接接头扭转强度。

The characteristics of friction welding joint of T2 copper and 1Crl8Ni9Ti stainless steel in electric field were investigated. The influence of different kinds of the electric fields on the microstructure of the joints was analyzed, the distributions of chemical elements in friction welding joints were determined, and the torsion strength of joints was measured. All kinds of electric fields can promote the dynamic recrystallization of the weld metal. The effect of the electric field results in more homogenous recrystallization grains of the weld metal connected to the cathode of the power supply. The diffusion zone of the dominating chemical elements widens in the AC electric field or the static electric field for the specimen connected to the cathode. The torsion strength of the joints was improved in the electric field, especially in the AC electric field.