| 摘要: |
| 对5A02防锈铝与不锈钢0Cr18Ni9进行了电子束焊接,分析了接头成形、显微组织、力学性能与断口特征.结果表明,铝、钢的对中焊接头中生成了大量的脆性Fe-Al金属间化合物,未能实现有效连接.偏束焊接头成形总体较好,两母材实质为熔-钎连接,铝-钢界面上生成了一层厚度为1.5 μm的化合物层,X射线衍射分析结果显示化合物层由FeAl,FeAl3与FeAl6等相混合组成.熔-钎焊接头最高抗拉强度达136 MPa,为铝母材强度的62.7%,断口呈现出脆性断裂与韧性断裂的混合特征,接头的断裂发生在化合物层及其附近的铝焊缝区域. |
| 关键词: 5A02/0Cr18Ni9异种金属 电子束焊接 组织 力学性能 |
| DOI： |
| 分类号: |
| 基金项目:国家973计划基金资助项目(2010CB731704) |
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| Microstructure and mechanical properties of 5A02/0Cr18Ni9 joint by electron beam welding |
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ZHANG Binggang1, ZHANG Chunguang1, CHEN Guoqing1, Liu Wei1, LIU Chen-glai2
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1.National Key Laboratory of Advanced Welding Produc-tion Technology, Harbin Institute of Technology, Harbin 150001, China;2.Avic Shenyang Liming Aero-ingine(group)Corporation Ltd., Shenyang 110043, China
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| Abstract: |
| Electron beam welding was used to join alumi-num alloy 5A02 to stainless steel 0Cr18Ni9.Weld appearance,microstructure,mechanical properties and fracture characteristics were studied.The result showed that a lot of brittle Fe-Al inter-metallic compounds were formed in the joint welded by electron beam at the center between aluminum alloy 5A02 and stainless steel 0Cr18Ni9 and the base metals were not joined effectively.The formation of non-centered joints was good in general,and the base metals were joined in the form of fusion-brazing.There is a compounds layer about 1.5 μm in thickness on the interface of the joint,and the XRD analysis showed that it is comprised of FeAl,FeAl3 and FeAl6.The highest tensile strength of the joint was 136 MPa,reaches 62.7% of the aluminum alloy.The frac-ture showed a mixed brittle-ductile feature,and the fracture oc-cured in the compound layer and the aluminum weld near the compound layer. |
| Key words: 5A02/0Cr18Ni9 electron beam welding microstructure mechanical properties |
