Influence of processing technology on fracture feature of Ti6Al4V

5th International Conference Recent Trends in Structural Materials

Kube, V.^1 ; Losertová, M.^1 ; Škoda, J.^1 ; Konená, K.^1 ; Ijaz, F.M.^1

VŠB - Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Ostrava - Poruba, Czech Republic^1

关键词: Advanced manufacturing technologies;    High mechanical properties;    Morphology of fracture surfaces;    Processing technologies;    Selective laser melting;    Structural and mechanical properties;    Tension and compression;    Titanium-based implants;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/461/1/012046/pdf
DOI  :  10.1088/1757-899X/461/1/012046

来源: IOP

【 摘 要 】

Selective laser melting is an advanced manufacturing technology providing alternative method of producing complex components directly from 3D computer models. The paper is focused on problems related with selective laser melting technology (SLM) used for preparing titanium based implants. Two series of ten Ti6Al4V samples were mechanically tested in tension and compression respectively before and after heat treatment. Annealing under argon atmosphere consisted of solution treatment at 955 °C followed by furnace cooling to 855 °C with water quenching and ageing at 600 °C with air cooling. Fractography study of fracture surfaces was performed using scanning electron microscopy and the observation was correlated with structural and mechanical properties of the SLM specimens in the condition as-built or heat treated. The failure features of as-built specimens corresponded to the microstructure with relatively high porosity, martensite needles, microcracks and residual stresses. The heat treatment resulted in the transformation of martensite to (alpha + beta) lamellar structure modifying plastic properties that corresponded to the morphology of fracture surfaces. In spite of the porosity occurrence both specimen series exhibited high mechanical properties in tension as well as in compression.