AlSiNi钎料感应钎焊铝/钢接头的组织和力学性能

Microstructure and mechanical properties of aluminum/AlSiNi/steel joint by induction brazing

关键词:  铝/钢焊接|铝基钎料|成分形貌|力学性能|金属间化合物

Key words:  aluminum and steel brazing|Al-based filler metal|composition and morphology|mechanical property|intermetallic compound

摘要:

借助润湿试验、热分析等手段分析了AlSi12钎料和AlSiNi钎料的钎焊工艺性.使用扫描电镜、能谱分析、力学性能测试等手段分析了AlSi12，AlSiNi钎料钎焊铝/钢接头的组织形貌、断口形貌、相组成和力学性能.结果表明，AlSiNi钎料对钢的润湿性优于AlSi12钎料，但钎料熔化区间稍有扩大；在焊缝/钢界面处，AlSiNi钎料钎焊接头金属间化合物层的厚度为8.1 μm，比AlSi12钎料钎焊接头金属间化合物更薄，分布也更均匀；AlSiNi钎料钎焊接头中的含Ni金属间化合物塑韧性更好，与母材钢的结合力更强，AlSiNi钎料钎焊铝/钢接头抗拉强度高于AlSi12钎料钎焊接头.

Abstract:

The brazing performance of brazing filler metals AlSi12 and AlSiNi was analyzed by means of wetting test and thermal analysis. The microstructure, fracture morphology, phase composition and mechanical property of aluminum/steel joints brazed by AlSi12 and AlSiNi were analyzed by means of SEM, EDS and tensile strength test. The results showed that the wettability of AlSiNi filler metal is better than that of AlSi12, but the melting regions slightly enlarged. The thickness of the intermetallic compound layer in the AlSiNi brazing joint is 8.1 μm, which is thinner and more uniformly distributed than that in the AlSi12 brazing joint. The Ni-containing intermetallic compounds in AlSiNi brazing joint have better plastic toughness and stronger bonding force with steel. As a result, aluminum/steel brazing joint with AlSiNi has higher tensile strength than that with the AlSi12 joint.