The influence of processing parameters on aluminium alloy A357 manufactured by Selective Laser Melting
The influence of processing parameters on aluminium alloy A357 manufactured by Selective Laser Melting
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DOI：
10.1016/j.matdes.2016.07.009
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发表时间：
2016-11-05
影响因子：
8.4
通讯作者：
Davies, Chris H. J.
中科院分区：
文献类型：
--
作者：
Rao, Heng;Giet, Stephanie;Davies, Chris H. J.
研究了选区激光熔化（SLM）工艺对A357铝合金显微组织和力学性能的影响。SLM工艺参数进行了优化，以实现最大的密度，对应于一个非常精细的微观结构，具有非常少的孔隙。这转化为与常规铸造合金相比的机械性能差异。基于相对密度与激光参数和能量输入曲线，分析了SLMed A357 Al样品中的孔隙率。衬底温度和激光参数的组合通过改变熔池形态和共晶Si晶胞特性来影响机械性能。SLMed铝样品的各向异性的解释有关的微观结构的方向性的基础上在水平和垂直拉伸样品的变形响应的差异。通过比较拉伸试样的断裂面与不同平面的微观结构特征，进行了断口分析研究，以了解拉伸性能。这导致了一个解释，为什么拉伸性能是更好的水平测试样品比垂直的一个as-SLMed材料。(C)2016爱思唯尔有限公司版权所有。
The aim of this work is to investigate the effects of Selective Laser Melting (SLM) on the microstructure and mechanical properties of A357 aluminium alloys. The SLM processing parameters were optimised to achieve maximum density, corresponding to an extremely fine microstructure with very few pores. This translates to differences in mechanical properties compared to conventional cast alloy. Porosity in SLMed A357 Al samples was analysed based on relative density versus laser parameter and energy input curves. Substrate temperatures and the combination of laser parameters influence the mechanical properties via changes in melt pool morphology and eutectic Si cell characteristics. The anisotropy of SLMed Al samples is explained in relation to the directionality of the microstructure based on differences in the deformation response of horizontal and vertical tensile samples. Fractographic studies have been performed to understand tensile properties by comparing fracture surfaces of tensile samples with microstructural features in different planes. This has led to an explanation of why the tensile properties are better for the horizontal test samples than for the vertical ones in an as-SLMed material. (C) 2016 Elsevier Ltd. All rights reserved.