Effect of sintering parameters on mechanical properties of injection moulded Ti–6Al–4V alloys

Abstract

This paper describes the microstructural and mechanical properties of injection moulded Ti–6Al–4V parts. Ti–6Al–4V powder was injection moulded with wax based binder. The critical powder loading for injection moulding was 67·5 vol.-% for feedstock. Binder debinding was performed with solvent and thermal method. After debinding the samples were sintered at different temperatures and times in vacuum atmosphere (10⁻⁴ torr). Metallographic studies were conducted to determine to extend densification and the corresponding microstructural changes. The results show that Ti–6Al–4V powder could be sintered to a maximum 99% of theoretical density. Maximum ultimate tensile strength and hardness were obtained 704 MPa and 38·6 HRC at 1275°C for 10 h.

Keywords:

• POWDER INJECTION MOULDING
• TI-6AL-4V ALLOY
• SINTERING
• MECHANICAL PROPERTIES