Mechanical properties and strain rate sensitivity of 3D laserdeposited Ti-6Al-4V alloy

¹ Weapon Systems Engineering, Korea University of Science and Technology, 34113 Daejeon, Republic of Korea
² The 4th Research and Development Institute, Agency for Defense Development, 34186 Daejeon, Republic of Korea

^* Corresponding author: dntkdg@ust.ac.kr

Published online: 7 September 2018

Abstract

Ti-6Al-4V has become the most common material in titanium alloy. Due to High specific strength, low density and excellent mechanical properties, it has been used in not only living, sports goods but also aerospace, defense industries. Usually these products have complex geometry, so there are a lot of limitations in general manufacturing process. Especially in weapon systems, applied loadings are severe therefore choice of materials is very important. 3D printing method is useful for manufacturing these complicated structure and suitable to discontinued, superannuated part of products. In this study, specimen for experiments is turned out by using 3d laser deposition technology which metal powder is injected into the focused beam of a high-powered laser. While lots of studies are mainly concerned with normal process, it is not commonly researched for metallic materials forming through 3D printing. In the 10^-3~10³/s strain rates range, two kinds of plate samples and LDAM Ti-6Al-4V were performed using universal testing machine and SHPB for dynamic material properties. Simplified Johnson-Cook constitutive equation parameters produced from these experiments.