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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Phase Composition of Ni-Based Alloy Obtained by High-Speed Direct Laser Deposition
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Microstructure and Phase Composition of Ni-Based Alloy Obtained by High-Speed Direct Laser Deposition

机译：高速直接激光沉积获得的Ni基合金的微观结构和相组合物

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摘要

Phase composition and structural features of nickel-based alloy EP741 obtained by high-speed direct laser deposition were discussed in the paper. The technology of high-speed direct laser deposition has been successfully applied during the formation of samples with the various operating parameters of the experimental device. The laser power was between 450 and 1200W, the scanning speed was 1.2mm/s, the powder feed rate was 45g/min, and the laser beam diameter was 1.2mm. The structure and phase composition of the initial material and as-deposited samples were studied using optical and scanning electron microscopy, x-ray analysis and transmission electron microscopy. The investigation has shown that spherical particles of powder (EP741) can be used to form products by additive manufacturing with the presence of additional heat treatment, since almost all the as-deposited samples obtained do not contain cracks, and large volume of pores was observed only in the sample obtained with the power of 450W. In addition, the phase composition of the as-deposited samples showed a high content of precipitating phase Ni-3(Al, Ti) in matrix, which is coherent to the solid solution based on nickel. In theory, the presence of Ni-3(Al, Ti) phase corresponds to the heat-treated nickel-base alloy obtained by standard methods of processing.
机译：本文讨论了通过高速直接激光沉积获得的镍基合金EP741的相组成和结构特征。在具有实验装置的各种操作参数的样品期间成功地应用了高速直接激光沉积技术。激光功率在450和1200W之间，扫描速度为1.2mm / s，粉末进料速率为45g / min，激光束直径为1.2mm。使用光学和扫描电子显微镜，X射线分析和透射电子显微镜研究初始材料和沉积样品的结构和相组合物。研究表明，粉末（EP741）的球形颗粒可用于通过附加热处理的添加制造形成产物，因为几乎所有所得沉积的样品不含裂缝，并且观察到大量的孔隙仅在以450W的功率获得的样品中。另外，沉积的样品的相组合物在基质中显示出高含量的沉淀相Ni-3（Al，Ti），其基于镍的固溶溶液相干。理论上，Ni-3（Al，Ti）相的存在对应于通过标准加工方法获得的热处理的镍基合金。

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