Studying hardness, workability and minimum bending radius in selectively laser-sintered Ti_6Al_4V alloy samples

International Conference on Mechanical Engineering, Automation and Control Systems 2017

机械制造;无线电电子学;计算机科学

Galkina, N.V.^1 ; Nosova, Y.A.^1 ; Balyakin, A.V.^1

Samara University, Moskovskoye shosse 34, Samara

443086, Russia^1

关键词: Annealed samples;    Ductility factor;    Lateral fracture;    Optical metallography;    Selective laser sintering;    Service performance;    Sintered samples;    Ti-6al-4v titanium alloys;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/327/4/042034/pdf
DOI  :  10.1088/1757-899X/327/4/042034

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

This research is relevant as it tries to improve the mechanical and service performance of the Ti-6Al-4V titanium alloy obtained by selective laser sintering. For that purpose, sintered samples were annealed at 750 and 850°C for an hour. Sintered and annealed samples were tested for hardness, workability and microstructure. It was found that incomplete annealing of selectively laser-sintered Ti-6Al-4V samples results in an insignificant reduction in hardness and ductility. Sintered and incompletely annealed samples had a hardness of 32.33 HRC, which is lower than the value of annealed parts specified in standards. Complete annealing at temperature 850°C reduces the hardness to 25 HRC and ductility by 15..20%. Incomplete annealing lowers the ductility factor from 0.08 to 0.06. Complete annealing lowers that value to 0.025. Complete annealing probably results in the embrittlement of sintered samples, perhaps due to their oxidation and hydrogenation in the air. Optical metallography showed lateral fractures in both sintered and annealed samples, which might be the reason why they had lower hardness and ductility.