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Overmelting and closing of thin horizontal channels in AlSi10Mg samples obtained by selective laser meltingстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Solyaev Y., Rabinskiy L., Tokmakov D.
- Журнал: Additive Manufacturing
- Том: 30
- Год издания: 2019
- Издательство: Elsevier B.V.
- Местоположение издательства: Netherlands
- Номер статьи: 100847
- DOI: 10.1016/j.addma.2019.100847
- Аннотация: This paper presents the results of numerical simulations and experimental tests on AlSi10Mg samples, having thin cylindrical channels built in the horizontal direction, using selective laser melting technology. The thermal state of the samples with channels of varying diameters is investigated by employing a simplified part-scale transient model that takes into consideration the overmelting effects through the change of the materials properties related with phase transition effects in the melted area of the sample. Comparison of simulation results and computing tomography of experimental samples reveal that the final cross section geometry of thin channels can be predicted and evaluated by the proposed model. Namely, it is found that the unsupported down-skin area of the channels is processed with formation of protrusions due to presence of the low conductive powder bed under the melted metal layer. This powder area overheated during laser action and melted together with desirable solid region of the model. Overmelting effects lead to the total closing of the channels with diameter less than 200 μm, partial closing of the channels of diameters 0.2-1 mm, and distortion of the cross section of larger channels. Possible approaches of adjusting the geometry of a channel are studied, considering the teardrop and enlarged shapes of the cross sections, which could help obtain a predefined cylindrical shape of the channels.
- Добавил в систему: Соляев Юрий Олегович