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Comparison of a commercial powder and a powder produced from Ti–6Al–4V chips and their effects on compacts sintered by the sinter-HIP method

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International Journal of Minerals,Metallurgy and Materials 2019年第7期26卷 878-888页

作者： Mustafa Ustundag remzi varol Department of Mechanical Engineering Suleyman Demirel University

The present paper is related to the conversion of Ti–6Al–4V chips into powder and investigates the usability of the produced powder in powder metallurgy applications. In this regard, a disc-milling process was applied to Ti–6Al–4V chips and the obtained powder was subsequently compacted. The compacted samples were sintered by the sinter hot isostatic pressing (sinter-HIP) method at 1200°C under high vacuum, their mechanical properties and microstructure were investigated and compared with those of commercial powder compacts subjected to the same preparation processes. The results showed that the produced powder exhibits greater flowability and higher apparent density than the commercial powder. However, the sintered products prepared from the commercial powder exhibited a higher relative density, lower porosity, and, as a result, greater flexural strength compared with the sintered compacts prepared from the produced powder. In addition, transgranular fracture was greater in the sintered products of the commercial powder. The microstructural studies revealed that the sintered products made from both the commercial and the produced powders consisted of α- and β-phase but contained more α-phase. All of the examined properties were found to be substantially affected by the particle size of the powders.

关键词： Ti-6Al-4V chips sinter hot isostatic pressing flexural strength porosity

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Comprehensive analysis of pulsed plasma nitriding preconditions on the fatigue behavior of AISI 304 austenitic stainless steel

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International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 657-664页

作者： Okan Unal Erfan Maleki remzi varol Mechanical Engineering Department Karabuk UniversityKarabuk 78050Turkey Modern Surface Engineering Laboratory(MSELAB) Karabuk UniversityKarabuk 78050Turkey Mechanical Engineering Department Sharif University of Technology-International CampusKish Island 79417-76655Iran Mechanical Engineering Department Suleyman Demirel UniversityIsparta 32200Turkey

This study aims to draw an exact boundary for microstructural and mechanical behaviors in terms of pulsed plasma nitriding *** pulsed plasma nitriding treatment was applied to AISI 304 austenitic stainless steel at different temperatures and *** reveal that nitriding depth increased as process temperature and duration *** nitriding depth remarkably increased at 475℃for 8 h and at 550℃for 4 *** austenite structure was transformed into a metastable nitrogen-oversaturated body-centered tetragonal expanded austenite(S-phase)during low-temperature plasma *** S-phase was converted to CrN precipitation at 475℃for 8 h and at 550℃for 4 *** hardness and fatigue limit increased through plasma nitriding regardless of process *** best surface hardness and fatigue limit were obtained at 550℃for 4 h because of the occurrence of CrN precipitation.

关键词： pulsed plasma nitriding S-phase fatigue nitrided layer

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Influence of Electromagnetic Fields on Bone Fracture in Rats: Role of CAPE

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Biomedical and Environmental Sciences 2009年第2期22卷 157-160页

作者： EKREM CICEK OSMAN GOKALP remzi varol GOKHAN CESUR Department of Physics Faculty of Arts and ScienceMehmet Akif Ersoy UniversityBurdurTurkey Suleyman Demirel University Department of Pharmacology Suleyman Demirel University Department of Mechanical Engineering Faculty of EngineeringSuleyman Demirel University Department of Physiology Faculty of Medicine Suleyman Demirel University

Objective To study the effects of radiation emitted by mobile phones on bone strength and caffeic acid phenethyl ester （CAPE） on the changes induced by radiation. Methods Forty-eight Sprague-Dawley rats were divided into five groups. Rats in the control group （first group） were left within the experimental setup for 30 min/day for 28 days without radiation exposure. Nine hundred MHz radiation group was broke down into 2 subgroups （group 1/2）. Both subgroups were exposed to radiation for 28 days （30 min/day）. The next group was also divided into 2 subgroups （group 3/4）. Each was exposed to 1800 MHz of radiation for 28 days （30 mirdday）. The third and fifth groups were also treated with CAPE for 28 days. Treatment groups received ip caffeic acid phenethyl ester （10 ktmol/kg per day） before radiation session. Bone fracture was analyzed. Results Breaking force, bending strength, and total fracture energy decreased in the irradiated groups but increased in the treatment groups. Conclusion Radiation and CAPE can significantly improve bone.

关键词： Mobile phone Biomechanical study Caffeic acid phenethyl ester

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Size Effects of Recovered Ti-6Al-4V Alloy Scrap by Conventional P/M Techniques

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材料科学与工程（中英文B版） 2018年第3期8卷 120-125页

作者： Mustafa Ustundag Mehmet Fahri Sarac remzi varol Department of Mechanical Engineering Suleyman Demirel University Isparta 32260 Turkey

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