| 摘要: |
| Fe3A1/18-8扩散焊界面不均匀地分布着第二相析出物,特别是交界面处连续分布的析出相族可能直接诱发裂纹,是引起接头失效的重要因素。对Fe3A1/18-8扩散焊接头进行再加热,采用扫描电镜、能谱分析、X射线衍射等对析出相及界面相结构进行分析。结果表明,再加热后界面析出相细化且形状规则,均匀分布于Fe3A1/18-8界面,析出相族消失。界面附近的显微硬度降低,不存在高硬度脆性相。 |
| 关键词: Fe3A1/18-8扩散焊界面 再加热 析出相 相结构 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(50375088) |
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| Effect of re-heating on microstructures near Fe3A1/18-8 diffusion bonding interface |
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MA Hai-jun, LI Ya-jiang, WANG Juan, YIN Yan-sheng
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Key Lab of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan 250061, China
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| Abstract: |
| There unevenly distributed second-phase precipitations at the Fe3A1/18-8(stainless steel) diffusion bonding interface directly.Especially,the continuous precipitation groups at the boundary could induce welding cracks,which was the main factor caused the failure of the Fe3A1/18-8 diffusion-bonded joint.The Fe3A1/18-8 diffusion-bonded joint was re-heated and the precipitation and phase constituent of the interface were analysed by means of scanning electron microscope,energy dispersive spectrum and X-ray diffraction.The results indicated that the precipitation distributs evenly at the Fe3A1/18-8 diffusion bonding interface due to the effect of re-heating and the precipitation becomes tiny and regular.The continuous precipitation groups are liquated.The microhardness near the Fe3A1/18-8 diffusion bonding interface decreases and there are no higher-microhardness brittle phases after re-heating. |
| Key words: Fe3A1/18-8(stainless steel) diffusion bonding interface re-heating precipitation phase constituents |
