Materials Science and Engineering

Biography

Biography: Kateřina Mertová,

Abstract

In the scope of this paper, the usage of the miniature samples and investigating using small samples is discussed. The miniature samples were used for determination of mechanical properties for titanium alloy deposited by additive manufacturing. The tensile tests on the standard and the miniature samples were provided for commonly used Ti-6-Al-4V alloy. These titanium alloy samples were produced by electron beam melting and by selective laser melting method that belongs to powder bed fusion processes of 3D printing. The purpose of this work was to demonstrate that local material characteristic can be obtained using the miniature specimen. The usage of small samples could provide many advantages for testing of mechanical properties. In our investigation it is shown that the results are in good agreement for standard and miniature specimens. The strength characteristics reached identical values. However, the plastic characteristic, such as elongation and reduction of area, are not comparable duo to the presence of internal defects. The small defects, such as lack of fusion or pores, have major impact on the miniature samples in comparison to the negligible influence on the larger specimens. The fractography included in this research reveals the differences for the small and standard size specimens.