摘要: |
对K4169和GH4169形成的对接接头进行了电子束焊接,利用金相分析和扫描电镜对K4169铸造高温合金一侧电子束焊接热影响区微裂纹行为进行了分析。研究发现,K4169一侧电子束焊接裂纹均发生于熔合线附近的热影响区,该区域化学组分不均匀,偏析严重,低熔点共晶易在晶间聚集,轻微的形成胡须组织,较严重的表现为裂纹。通过改善散热条件和优化工艺参数有助于减小热影响区微裂纹倾向。 |
关键词: K4169;电子束焊接;热影响区;微裂纹 |
基金项目: |
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Analysis on Micro-fissuring Behavior ofElectron-beam Welded K4169 Cast Nickel-based Super-alloy |
Zhang Lina Li Jingmin Ma Fang Liu Jingduo Zhang Yikun
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Capital Aerospace Machinery Company, Beijing 100076
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Abstract: |
Adopting electron-beam welding (EBW) welded K4169 and GH4169 butt joint, the micro-fissuring behaviors in the heat-affected zone (HAZ) of electron beam welded cast super-alloy K4169 have been studied by using analytical scanning electron microscopy. It was observed that the micro-cracks besides K4169 initiated in the regions of HAZ nearby the fusion line, in the region the chemical components were non-uniform, the element segregation was greater and the low-melting point eutectics were easier to aggregate intergranular, which were formed beard tissue slightly or cracks seriously. Controlling the heat input and optimizing the process parameters are helpful to decrease the tendency of micro-cracks. |
Key words: K4169;EBW;HAZ;micro-fissuring |