akgun Alsaran | ATATÜRK ÜNİVERSİTESİ (original) (raw)
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Papers by akgun Alsaran
European Journal of Orthopaedic Surgery & Traumatology, 2013
Kafkas Üniversitesi Veteriner Fakültesi Dergisi
[1] This study was presented in 11th National Veterinary Surgery Congress, 19th-22nd May 2010, Be... more [1] This study was presented in 11th National Veterinary Surgery Congress, 19th-22nd May 2010, Belek - Antalya, Turkey * Department of Orthopaedic Surgery, Faculty of Medicine, Kafkas University, TR-36100 Kars - TURKEY ** Department of Surgery, Faculty of Veterinary ...
Kovove Materialy
Plasma nitriding treatment of 316L austenitic stainless steel has been performed in 80%H2-20%N2 g... more Plasma nitriding treatment of 316L austenitic stainless steel has been performed in 80%H2-20%N2 gas mixture, for various treatment times (1, 4 and 8 h) and at relatively low temperatures (400, 450 and 500 • C). Mechanical and tribological properties of the plasma nitrided 316L stainless steel were examined using X-ray diffraction, microhardness tester, scanning electron microscopy and pin-on-disc tribotester. The results show that the modified surface specimens of nitrided 316L stainless steel at 400 • C consist mainly of s-phase and small chromium nitride precipitates. At higher temperatures both CrN and iron (γ-Fe4N) nitrides have been observed and their amount increases with increasing treatment temperature. The highest hardness values were attained at 500 • C and 8 h, an increase of surface hardness was observed with increasing process time. Also wear resistance was improved after nitriding. The wear rate decreased with increasing process time and temperature. After electrochemi...
Surface and Coatings Technology, 2009
Tribology International, 2010
ABSTRACT 316L stainless steel and Ti6Al4V alloy were plasma nitrided at different treatment param... more ABSTRACT 316L stainless steel and Ti6Al4V alloy were plasma nitrided at different treatment parameters, and the wear behaviors of the modified layers formed on the surface during nitriding were investigated by multi-pass scratch test. Phase structure and cross-sections of modified layers were also examined with XRD and SEM. While a single modified layer formed on surface of the 316L stainless steel, both modified and diffusion layers were observed on the surface of the Ti6Al4V alloy after nitriding. As a result, it was observed that phase structure and thickness for modified layers of 316L stainless steel and Ti6Al4V alloy, respectively, were the significant parameters for friction coefficient and wear rate. In addition, diffusion layer formed during the nitriding process caused on increase of wear resistance of Ti6Al4V alloy by supporting the modified layer on the surface.
Surface and Coatings Technology, 2014
SAÜ Fen Bilimleri Enstitüsü Dergisi, 2012
Surface and Coatings Technology, 2004
A post-oxidation treatment was performed for times of 15, 30 and 60 min at a substrate temperatur... more A post-oxidation treatment was performed for times of 15, 30 and 60 min at a substrate temperature of 500 °C to investigate the tribological and corrosion properties of plasma nitrided AISI 5140 steel. The structural, mechanical, tribological and corrosion properties were analyzed by ...
Surface and Coatings Technology, 2008
Surface and Coatings Technology, 2008
Surface and Coatings Technology, 2008
Materials & Design, 2005
The effect of magnetic field with different intensities on fatigue life of AISI 4140 steel has be... more The effect of magnetic field with different intensities on fatigue life of AISI 4140 steel has been investigated. For this purpose, unnotched and notched specimens were prepared from AISI 4140 steel. It was obtained that when the magnetic field especially was applied to the ...
Tribology International, 2011
ABSTRACT This study investigates the effects of thickness, hardness and composition of modified l... more ABSTRACT This study investigates the effects of thickness, hardness and composition of modified layer on the plain and fretting fatigue properties of the nitrided 316L steel plasma nitrided under various processing conditions. Fretting fatigue behaviour of untreated and nitrided material is also analysed with the finite element method. Experimental and theoretical fatigue life results are compared. The result indicates that the nitriding process improved the fretting fatigue properties of 316L stainless steel. The experimental test results are close to theoretical fretting fatigue life results, thus it yields that the established model in the numerical analysis is consistent in this regard.
European Journal of Orthopaedic Surgery & Traumatology, 2013
Kafkas Üniversitesi Veteriner Fakültesi Dergisi
[1] This study was presented in 11th National Veterinary Surgery Congress, 19th-22nd May 2010, Be... more [1] This study was presented in 11th National Veterinary Surgery Congress, 19th-22nd May 2010, Belek - Antalya, Turkey * Department of Orthopaedic Surgery, Faculty of Medicine, Kafkas University, TR-36100 Kars - TURKEY ** Department of Surgery, Faculty of Veterinary ...
Kovove Materialy
Plasma nitriding treatment of 316L austenitic stainless steel has been performed in 80%H2-20%N2 g... more Plasma nitriding treatment of 316L austenitic stainless steel has been performed in 80%H2-20%N2 gas mixture, for various treatment times (1, 4 and 8 h) and at relatively low temperatures (400, 450 and 500 • C). Mechanical and tribological properties of the plasma nitrided 316L stainless steel were examined using X-ray diffraction, microhardness tester, scanning electron microscopy and pin-on-disc tribotester. The results show that the modified surface specimens of nitrided 316L stainless steel at 400 • C consist mainly of s-phase and small chromium nitride precipitates. At higher temperatures both CrN and iron (γ-Fe4N) nitrides have been observed and their amount increases with increasing treatment temperature. The highest hardness values were attained at 500 • C and 8 h, an increase of surface hardness was observed with increasing process time. Also wear resistance was improved after nitriding. The wear rate decreased with increasing process time and temperature. After electrochemi...
Surface and Coatings Technology, 2009
Tribology International, 2010
ABSTRACT 316L stainless steel and Ti6Al4V alloy were plasma nitrided at different treatment param... more ABSTRACT 316L stainless steel and Ti6Al4V alloy were plasma nitrided at different treatment parameters, and the wear behaviors of the modified layers formed on the surface during nitriding were investigated by multi-pass scratch test. Phase structure and cross-sections of modified layers were also examined with XRD and SEM. While a single modified layer formed on surface of the 316L stainless steel, both modified and diffusion layers were observed on the surface of the Ti6Al4V alloy after nitriding. As a result, it was observed that phase structure and thickness for modified layers of 316L stainless steel and Ti6Al4V alloy, respectively, were the significant parameters for friction coefficient and wear rate. In addition, diffusion layer formed during the nitriding process caused on increase of wear resistance of Ti6Al4V alloy by supporting the modified layer on the surface.
Surface and Coatings Technology, 2014
SAÜ Fen Bilimleri Enstitüsü Dergisi, 2012
Surface and Coatings Technology, 2004
A post-oxidation treatment was performed for times of 15, 30 and 60 min at a substrate temperatur... more A post-oxidation treatment was performed for times of 15, 30 and 60 min at a substrate temperature of 500 °C to investigate the tribological and corrosion properties of plasma nitrided AISI 5140 steel. The structural, mechanical, tribological and corrosion properties were analyzed by ...
Surface and Coatings Technology, 2008
Surface and Coatings Technology, 2008
Surface and Coatings Technology, 2008
Materials & Design, 2005
The effect of magnetic field with different intensities on fatigue life of AISI 4140 steel has be... more The effect of magnetic field with different intensities on fatigue life of AISI 4140 steel has been investigated. For this purpose, unnotched and notched specimens were prepared from AISI 4140 steel. It was obtained that when the magnetic field especially was applied to the ...
Tribology International, 2011
ABSTRACT This study investigates the effects of thickness, hardness and composition of modified l... more ABSTRACT This study investigates the effects of thickness, hardness and composition of modified layer on the plain and fretting fatigue properties of the nitrided 316L steel plasma nitrided under various processing conditions. Fretting fatigue behaviour of untreated and nitrided material is also analysed with the finite element method. Experimental and theoretical fatigue life results are compared. The result indicates that the nitriding process improved the fretting fatigue properties of 316L stainless steel. The experimental test results are close to theoretical fretting fatigue life results, thus it yields that the established model in the numerical analysis is consistent in this regard.