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Investigation of surface properties of high temperature nitrided titanium alloys

Koyuncu E., Kahraman F., Karadeniz Ö.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 37, nr 2

434-441

Purpose: The purpose of paper is to investigate surface properties of high temperature nitrided titanium alloys. Design/methodology/approach: In this study, surface modification of Ti6Al4V titanium alloy was made at various temperatures by plasma nitriding process. Plasma nitriding treatment was performed in 80% N2-20% H2 gas mixture, for treatment times of 2-15 h at the temperatures of 700-1000°C. Surface properties of plasma nitrided Ti6Al4V alloy were examined by metallographic inspection, X-Ray diffraction and Vickers hardness. Findings: Two layers were determined by optic inspection on the samples that were called the compound and diffusion layers. Compound layer contain TiN and Ti2N nitrides, XRD results support in this formations. Maximum hardness was obtained at 10h treatment time and 1000°C treatment temperature. Micro hardness tests showed that hardness properties of the nitrided samples depend on treatment time and temperature. Practical implications: Titanium and its alloys have very attractive properties for many industries. But using of titanium and its alloys is of very low in mechanical engineering applications because of poor tribological properties. Originality/value: The nitriding of titanium alloy surfaces using plasma processes has already reached the industrial application stage in the biomedical field.

Investigation of surface properties of high temperature nitrided titanium alloys

Koyuncu E., Kahraman F., Karadeniz O.

Archives of Materials Science

2008

Vol. 29, nr 1-2

50-62

Titanium and its alloys have very attractive properties for many industries. But using of titanium and its alloys are very low in mechanical engineering applications because of poor tribological properties. In this study, surface modification of Ti6Al4V titanium alloy has been made with various temperatures by plasma nitriding process. Plasma nitriding treatment has been performed in 80% N2-20% H2 gas mixture, for treatment times of 2-15 h at the temperatures of 700-1000 degree C. Surface properties of plasma nitrided Ti6Al4V alloy was examined by metalographic inspection, X-Ray difraction and vichers hardness. Two layers were determined by optic inspection on the samples that called compound and diffusion layers. Compound layer contain TiN and Ti2N nitrides, XRD results support in this formations. Maximum hardness has been obtained at 10h treatment time and 1000 degree C treatment temperature. Micro hardness tests showed that hardness properties of the nitrided samples depend on treatmant time and temperature.