To evaluate specimen size dependence on the tensile properties of additively manufactured (AM) components, various rectangular specimens, ranging from miniaturised to ASTM standard specimens, are machined from electron beam melted Ti-6Al-4V and used for the tensile testing. It is found that the elongation is strongly related to the sample size while the yield and ultimate tensile strengths exhibit an independent feature. Three major aspects, (i) presented location of lack of fusion, (ii) size and segregation of pores, and (iii) slimness ratio, have a synergic influence on the elongation of different specimen sizes with various cross-section area. Our findings suggest that microscale tests arise uncertainties in measurement, which must be considered in order to provide quantifiable levels of confidence when applying such tests to discriminate a material’s behaviour. The experimental results and analyses provide a guideline for the design and testing of non-standard specimens for AM components.

为了评估样品尺寸对增材制造（AM）部件的拉伸性能的依赖性，从电子束熔化的Ti-6Al-4V机加工了各种矩形样品（从小型样品到ASTM标准样品），并将其用于拉伸测试。发现伸长率与样品大小密切相关，而屈服强度和极限抗张强度则具有独立的特征。三个主要方面，（i）呈现出缺乏融合的位置，（ii）孔的大小和分离，以及（iii）纤细比，对不同横截面面积的不同样本尺寸的伸长具有协同影响。我们的发现表明，微型测试在测量中会带来不确定性，在进行此类测试以区分材料的行为时，必须考虑到这一点，以便提供可量化的置信度。实验结果和分析为AM组件的非标准样品的设计和测试提供了指导。