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Heat treatment effect on the mechanical properties and fracture mechanism in AlSi10Mg fabricated by additive manufacturing selective laser melting process

机译：热处理对增材制造选择性激光熔炼AlSi10Mg力学性能和断裂机理的影响

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摘要

Many researches have been conducted on the topic of the AlSi10Mg alloy, covering different aspects of the selective laser melting fabrication process. However, a database is still lacking much information and understanding regarding the properties of the material under different conditions, which will allow a tailoring of suitable properties to the required application. This work aims to provide a correlation between the mechanical properties of vertically built (Z samples) AlSi10Mg specimens subjected to different post-processing conditions and the change in properties in relation to these conditions and the fracture mechanism. Among these is the accepted T5 stress relief treatment, a modified T5 treatment, the as-built condition and a high temperature Hot Isostatic Pressing treatment. A more in-depth analysis of the fracture mode for the vertical build direction is provided with emphasis on the mechanism for each treatment as well as a quantitative analysis of the Full Width at Half Maximum via X-Ray diffraction measurements. The modified T5 treatment suggested was found to result in an increase in strength values beyond those of the as-built condition and a 64% increase in yield stress compared to the typical T5 treatment with a concurrent decrease in elongation values. It is suggested that at 200 °C nano-scale precipitation of Silicon particles occurs, responsible for the strength elevation. Charpy impact test results are provided for each condition and their fracture mode is compared to the tensile tests and discussed.
机译：关于AlSi10Mg合金的主题已经进行了许多研究，涵盖了选择性激光熔化制造工艺的各个方面。但是，数据库仍然缺乏有关材料在不同条件下的性能的信息和理解，这将允许为所需的应用量身定制合适的性能。这项工作的目的是在垂直构造（Z样品）的AlSi10Mg试样经受不同后处理条件的力学性能与与这些条件和断裂机理相关的性能变化之间建立关联。其中包括公认的T5应力消除处理，改进的T5处理，实际状态和高温热等静压处理。对垂直构造方向的断裂模式进行了更深入的分析，重点是每种处理的机理以及通过X射线衍射测量对半峰全宽的定量分析。与传统的T5处理相比，建议的改进的T5处理导致强度值增加到超出已建状态的强度，并且屈服应力增加64％，同时伸长率值降低。建议在200 C时发生硅颗粒的纳米级沉淀，这是强度增加的原因。提供了每种条件下的夏比冲击试验结果，并将其断裂模式与拉伸试验进行了比较并进行了讨论。

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