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采用铝离子注入不锈钢前处理的方法优化了不锈钢/铝钎焊接头质量,研究了钎焊参数对不锈钢/铝钎焊接头形貌及相结构的影响。结果表明,铝离子注入不锈钢前处理的方法可以使后期钎焊获得更好的不锈钢/铝钎焊接头及焊趾形貌;随着钎焊温度的增高、钎焊时间的延长,不锈钢/铝钎焊接头界面脆性相厚度增大。注铝不锈钢/铝钎焊接头断裂形式与界面脆性相厚度密切相关,接头脆性相厚度小于10μm时,不锈钢侧断口处Al相含量很高,接头在钎料区失效,失效形式为韧性断裂;而脆性相厚度大于10μm时,不锈钢侧断口处Fe13Al4、FeAl2等脆性铁-铝相含量很高,接头断裂在脆性相区,接头失效形式为脆性断裂。
The quality of stainless steel / aluminum brazed joint was optimized by aluminum ion implantation pretreatment. The influence of brazing parameters on the morphology and phase structure of stainless steel / aluminum brazed joint was studied. The results show that the pre-treatment of stainless steel with aluminum ion implantation can make the stainless steel / aluminum brazed joint and the toe shape better in the later brazing. With the increase of the brazing temperature and the brazing time, the stainless steel / aluminum brazing Weld interface brittle phase interface thickness increases. The fracture form of the aluminum-stainless steel / aluminum brazed joint is closely related to the brittle phase thickness of the interface. When the brittle phase thickness is less than 10μm, the content of Al phase in the stainless steel side fracture is very high and the joint failure occurs in the brazing material area. The failure mode is ductile fracture. When the brittle phase thickness is more than 10μm, the content of brittle Fe-Al phase such as Fe13Al4 and FeAl2 at the stainless steel side fracture is very high, the joint breaks in the brittle phase and the failure mode of the joint is brittle fracture.