K418高温合金和42CrMo合金钢的激光焊接
Laser welding of superalloy K418 to 42CrMo steel
查看参考文献15篇
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文摘
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进行了K418高温合金和42CrMo钢的激光焊接实验，分别采用OM、SEM、XRD和EDS等手段分析了焊缝的金相组织和物相组成，评价了焊缝的显微硬度和拉伸强度。结果表明：焊缝主要由树枝状非平衡凝固的FeCrNiC（力固溶体组成，此外，还有少量细小、弥散的Ni_3Al（γ′）相、Laves颗粒和少量MC碳化物分布在树枝晶间区域。由于主要强化相γ′在激光辐照后的部分溶解和随后快速凝固的抑制作用，焊缝的硬度虽分布较均匀但低于母材。由于没有获得穿透的焊接接头，焊接接头的强度约只有母材的88．5％，焊缝的断裂机制是塑性和脆性断裂的混合机制。由于在焊缝中存在一些Laves颗粒，这促进了微裂纹和微孔的形成和扩展，降低了焊接接头的抗拉强度。 |
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其他语种文摘
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The superalloy K418 and steel 42CrMo were welded laser. The microstructure of the weld was characterized by optical microscopy （OM）, scanning electron microscopy （SEM）, X-ray diffraction （XRD） and energy dispersive spectrometer （EDS）. The mechanical properties of the weld were evaluated by microhardness and tensile strength testing. The results show that the laser weld has non-equilibrium solidified microstructures consisting of FeCrNiC austenite solid solution, and little fine and dispersed Ni3Al （γ′） phase, Laves particles and little MC carbides distribute in the interdendritic regions. The average microhardness of the weld is relatively uniform and lower than that of the base metal because the main strengthening phase γ′ partially dissolutes and solidifies quickly after laser. About 88.5% tensile strength of the base metal is achieved in the welded joint because the full penetration welding is gained, and the fracture mechanism is ductility and brittleness. The existence of some Laves particles in the weld also facilitates the initiation and propagation of the microcracks and microvoids and decreases the tensile strength of the welded joint. |
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来源
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中国有色金属学报
,2008,18(3):444-448 【核心库】
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关键词
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激光焊接
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焊缝
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组织
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力学性能
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地址
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1.
中国科学院力学研究所, 北京, 100080
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中原工学院材料与化学工程学院, 河南, 郑州, 450007
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1004-0609 |
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学科
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金属学与金属工艺;电子技术、通信技术 |
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基金
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中国科学院重大仪器研制资助项目（Y2003004）
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中国博士后科学基金
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文献收藏号
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CSCD:3258003
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