Effects of heat treatment on microstructure and mechanical behaviour of additive manufactured porous Ti6Al4V

3rd International Conference on Smart Material Research

Ahmadi, S.M.^1 ; Ashok Kumar Jain, R.K.^1 ; Zadpoor, A.A.^1 ; Ayas, C.^1 ; Popovich, V.A.^1

Delft University of Technology, Faculty of Mechanical, Maritime, and Materials Engineering, Mekelweg 2, Delft CD

2628, Netherlands^1

关键词: After-heat treatment;    Dynamic mechanical;    Effects of heat treatment;    Heat-treated specimens;    Martensitic microstructure;    Mechanical behaviour;    Medical industries;    Microstructure and mechanical properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/293/1/012009/pdf
DOI  :  10.1088/1757-899X/293/1/012009

来源: IOP

【 摘 要 】

Titanium and its alloys such as Ti6Al4V play a major role in the medical industry as bone implants. Nowadays, by the aid of additive manufacturing (AM), it is possible to manufacture porous complex structures which mimic human bone. However, AM parts are near net shape and post processing may be needed to improve their mechanical properties. For instance, AM Ti6Al4V samples may be brittle and incapable of withstanding dynamic mechanical loads due to their martensitic microstructure. The aim of this study was to apply two different heat treatment regimes (below and above β-transus) to investigate their effects on the microstructure and mechanical properties of porous Ti6Al4V specimens. After heat treatment, fine acicular ′ martensitic microstructure was transformed to a mixture of and β phases. The ductility of the heat-treated specimens, as well as some mechanical properties such as hardness, plateau stress, and first maximum stress changed while the density and elastic gradient of the porous structure remained unchanged.