| K418合金激光焊接接头组织与裂纹形成原因 |
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| 引用本文： | 庞铭,谭建松,王建平,吴波,解志民.K418合金激光焊接接头组织与裂纹形成原因[J].机械工程材料,2009(11). |
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| 作者姓名： | 庞铭 谭建松 王建平 吴波 解志民 |
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| 作者单位： | 中国北方发动机研究所分所; |
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| 摘 要： | 通过光学显微镜、扫描电镜、能谱仪等研究了镍基铸造高温合金K418激光焊接接头的组织和焊缝区域成分,分析了接头裂纹产生原因。结果表明:由于激光深熔焊接过程形成的金属蒸气和等离子体在焊缝正面附加热源效应,导致形成大钉头、小钉身的焊缝形貌;焊缝靠近母材的组织为具有一定方向的枝晶组织,且在焊缝与母材交界的不同区域具有锯齿形和光滑过渡两种形貌;焊接过程中,磷、硫和硅元素在晶界偏析形成的低熔点化合物提高了焊接熔池凝固温度范围,增加了焊接过程热裂纹敏感性。
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| 关 键 词： | 激光焊接 K418合金 焊接接头 低熔点化合物 |
Microstructure and Crack Formation in K418 Alloy Laser Welded Joints |
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| PANG Ming,TAN Jian-song,WANG Jian-ping,WU Bo,XIE Zhi-min.Microstructure and Crack Formation in K418 Alloy Laser Welded Joints[J].Materials For Mechanical Engineering,2009(11). |
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| Authors: | PANG Ming TAN Jian-song WANG Jian-ping WU Bo XIE Zhi-min |
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| Affiliation: | PANG Ming,TAN Jian-song,WANG Jian-ping,WU Bo,XIE Zhi-min(Substation China North Engine Research Institute,Langfang 065000,China) |
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| Abstract: | Microstructure and chemical composition of the weld seam of K418 Ni-base superalloy prepared by laser welding were characterized by optical microscopy,scanning electron microscopy,energy dispersive spectrometer.And the weld cracking formation was analyzed.The results show that nailhead shape morphology of weld seam could form as the heat effect of plasma and metal vapor formed during the welding process.Microstructure of dendrites could be observed between weld seam and base metal.There were sawtooth and sm... |
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| Keywords: | laser welding K418 alloy welding joint low melting point eutectics |
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