Investigation of surface properties of high temperature nitrided titanium alloys

• Autorzy: Koyuncu E. , Kahraman F. , Karadeniz Ö.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

plasma nitriding; titanium nitriding; surface treatment

PL

azotowanie plazmowe; azotowanie tytanem; obróbka powierzchni

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2009
• Tom: Vol. 37, nr 2
• Strony: 434--441
• Opis fizyczny: Bibliogr. 11 poz., rys., tabl.

Twórcy

autor

Koyuncu E.

autor

Kahraman F.

autor

Karadeniz Ö.

• Department of Mechanical Engineering, Dokuz Eylül University, 35100 Ýzmir, Turkey,

Bibliografia

• [1] ASM International Handbook Committee, ASM Handbook- Vol. 2 Properties and Selection, Nonferrous Alloys and Special-Purpose Materials, ASM International, United States of America, 1990.
• [2] T. Bacci, F. Borgioli, E. Galvanetto, F. Galliano, B. Tesi, Wear resistance of Ti–6Al–4V alloy treated by means of glow-discharge and furnace treatments, Wear 240 (2000) 199-206.
• [3] K. C. Chen, G. J. Jaung, D. C. diode ion nitriding behaviour of titanium and Ti-6Al-4V, Thin Solid Films 303 (1997) 226-231.
• [4] A. Çelik, S. Karadeniz, S. Kaymaz, Plazma destekli modern yüzey islemleri, Proceedings of the 6th Denizli Malzeme Sempozyumu, 1995, 134-142.
• [5] F. Gallianoa, E. Galvanettoa, S. Mischler, D. Landoltb, Tribocorrosion behaviour of plasma nitrided Ti 6Al 4V alloy in neutral NaCl solution, Surface and Coatings Technology 145 (2001) 121-131.
• [6] S. Karadeniz, Plazma Teknigi, TMMOB Makine Mühendisleri Odasi Yayinlari, Yayin, 137, 1990 (in Turkey).
• [7] A. Molinari, G. Straffelini, B. Tesi, T. Bacci, G. Pradelli, Effects of load and sliding speed on the tribological behaviour of Ti6Al4V plasma nitrided at different temperatures, Wear 203-204 (1997) 447-454.
• [8] O. T. Inal, C. A. Zimmerly, H. Akbulut, Ion nitriding of explosively-clad titanium/steel tandems. Journal of Materials Science 34 (1999) 1641-1652.
• [9] T. Telbizova, S. Parascandola, F. Prokert, Ion nitriding of Al: Growth kinetics and characterisation of the nitride layer, Surface and Coatings Technology 142-144 (2001) 1028-1033.
• [10] F. Yildiz, A. F. Yetim, A. Alsaran, A. Çelik, Plasma nitriding behaviour of Ti6Al4V orthopaedic alloy, Surface and Coatings Technology (2007) 2472-2476.
• [11] A. Zhecheva, W. Sha, S. Malinov, A. Long, Enhancing the microstructure and properties of titanium alloys through nitriding and other surface engineering methods, Surface and Coatings Technology (2005) 2192-2207.