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Post heat treatment of additive manufactured AlSi10Mg: On silicon morphology, texture and small-scale properties

机译：添加剂制造的AlSi10Mg的后热处理：关于硅的形态，织构和小尺寸性能

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摘要

Post-fabrication heat treatment, including solution treatment (at 520 ℃ for 1 h) followed by water quenching (WQ), air cooling (AC) and furnace cooling (FC), was performed on a selective laser melted AlSilOMg alloy. The objective is to assess the effect of various cooling rates on the microstructure (specifically eutectic-Si morphology) and small-scale mechanical properties, measured by employing a depth-sensing nanoindentation platform, of the selective laser melted AlSilOMg alloy. Results show extensive evolutions in the microstructure and the mechanical properties of the heat-treated materials relative to the as-fabricated sample. Upon solutio-nizing treatment, the eutectic Si is first fragmented, then spheroidized, and finally coarsened when cooled with slow rates. The microstructural evolution directly affects the mechanical properties, where the as-fabricated and the FC are the hardest and the softest structures, respectively. This is directly attributed to the size and morphology of the eutectic-Si within the microstructure. The findings of this study could help to adjust the optimized heat-treatment process to fabricate SLM AlSilOMg parts with desirable microstructure and mechanical properties.
机译：在选择性激光熔化的AlSilOMg合金上进行了后加工热处理，包括固溶处理（在520℃下进行1小时），然后进行水淬（WQ），空冷（AC）和炉冷（FC）。目的是评估各种冷却速率对选择性激光熔化的AlSilOMg合金的微观结构（特别是共晶Si形态）和小规模机械性能的影响，这些性能是通过使用深度感应纳米压痕平台测量的。结果表明，相对于加工后的样品，热处理材料的微观结构和力学性能发生了广泛的变化。经过增溶处理后，共晶硅首先破碎，然后球化，最后在以慢速冷却时粗化。微观结构的演变直接影响机械性能，其中加工后的和FC分别是最硬和最软的结构。这直接归因于微结构内共晶硅的尺寸和形态。这项研究的发现可能有助于调整优化的热处理工艺，以制造具有所需微观结构和机械性能的SLM AlSilOMg零件。

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  • 来源
    《Materials Science and Engineering》 |2020年第may5期|139296.1-139296.12|共12页
  • 作者

    F. Alghamdi; X. Song; A. Hadadzadeh; B. Shalchi-Amirkhiz; M. Mohammadi; M. Haghshenas;

  • 作者单位

    Chicago Heights Steel Chicago Heights IL USA;

    Department of Mechanical Engineering Weifeng University of Science and Technology Weifeng China;

    Marine Additive Manufacturing Centre of Excellence (MAMCE) University of New Brunswick Fredericton NB E3B 5A1 Canada CanmetMATERIALS Natural Resources Canada 183 Longwood Road South Hamilton ON L8P 0A5 Canada Department of Mechanical Engineering University of Memphis Memphis TN USA;

    CanmetMATERIALS Natural Resources Canada 183 Longwood Road South Hamilton ON L8P 0A5 Canada Marine Additive Manufacturing Centre of Excellence (MAMCE) University of New Brunswick Fredericton NB E3B 5A1 Canada;

    Marine Additive Manufacturing Centre of Excellence (MAMCE) University of New Brunswick Fredericton NB E3B 5A1 Canada;

    Micro/Nano-Mechanics Laboratory Department of Mechanical Engineering University of Toledo Toledo OH USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Additive manufacturing; SLM AlSi10Mg; Heat treatment; Si spheroidization; Nanoindentation; Cooling rate; Texture;

    机译：添加剂制造;SLM AlSi10Mg;热处理;硅球化;纳米压痕冷却速度质地;

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