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以Ni箔为中间层材料,对汽车用AZ31合金和304不锈钢进行了扩散焊接处理,研究了不同焊接温度和焊接保温时间下的焊接接头的显微组织和物相组成变化,并对不同保温时间下的焊接接头扩散层显微硬度和剪切强度进行了分析。结果表明,AZ31/Ni/304焊接头界面可分为靠近304不锈钢扩散层、共晶层、白色块状化合物层和AZ31合金基体渗透层;随着焊接温度的逐渐升高,扩散层的整体厚度呈现逐渐减小的趋势;随着焊接保温时间的延长,焊接扩散层厚度先增加而后降低;在整个焊接接头界面中,白色块状Mg-Ni-Al三元金属间化合物层的显微硬度最高,且当保温时间为20 min时取得最大值269 HV;AZ31/Ni/304焊接头的剪切强度随着保温时间的延长呈先增加而后降低的趋势,在保温时间为20 min时取得剪切强度最大值。
With Ni foil as interlayer material, the AZ31 alloy and 304 stainless steel for automotive were treated by diffusion welding. The microstructure and phase composition of welded joints under different welding temperature and welding holding time were studied. The effects of different holding time Under the diffusion layer of the welded joint microhardness and shear strength were analyzed. The results show that the interface of AZ31 / Ni / 304 solder joint can be divided into the infiltration layer close to 304 stainless steel diffusion layer, eutectic layer, white massive compound layer and AZ31 alloy matrix. As the welding temperature gradually increases, the overall thickness of diffusion layer The thickness of the welding diffusion layer firstly increases and then decreases; the hardness of the white massive Mg-Ni-Al ternary intermetallic compound layer is the highest at the entire welding joint interface , And the maximum value of 269 HV was obtained when the holding time was 20 min. The shear strength of AZ31 / Ni / 304 welded joints increased first and then decreased with the increase of holding time, and shearing was obtained at holding time of 20 min The maximum intensity.