Abstract
The present work aims nitriding to investigate the effect on titanium grade 2 with rotating bending fatigue tests at room temperature and short-term creep tests at 500°C. The nitriding treatment was carried out at 850°C for 9 hours. After thermochemical treatment, XRD analysis revealed the formation layer composed of TiN and Ti2N. Microscopy analysis revealed the presence of a uniform layer with a mean thickness of 3.6 mM and 50% increase in surface roughness. Fatigue life (107 cycles) was reduced by 42% by increasing surface roughness. On the other hand, nitriding treatment increased creep life by at least two times due to oxidation rate reducion and blocking dislocations movement by nitrogen in solid solution during the plastic deformation process.
Highlights
Titanium and its alloys are applied in the aerospace, biomedical and petrochemical industries, since they have high strength/weight ra o, good corrosion resistance and biocompa bility [1, 2]
Creep deforma on mechanisms are typical in a system with high temperatures (T > 0.4 Tf) and constant load resul ng in medependent plas c deforma on
The fa gue tests were performed for all experimental condi ons in rota ng bending condi ons (R = -1), at room temperature, and conducted un l rupture or 107 cycles
Summary
Titanium and its alloys are applied in the aerospace, biomedical and petrochemical industries, since they have high strength/weight ra o, good corrosion resistance and biocompa bility [1, 2]. When subjected to cyclic loading, the microstructure of a metal component is modified with respect to disloca on distribu on and interac on. Surface treatments applied to tanium alloys, promotes resistance to erosion, oxida on and corrosion [7,8,9]. The results related with surface treatments applied on metal alloys subjected to fa gue are varied [12,13,14,15]. Further studies are needed to understand the different surface treatments influence on the mechanical behavior, under cyclic or constant loads, of an aeronau cal and biomedical material, such as tanium grade 2. This study aims to inves gate the nitriding effect on rota ng bending fa gue resistance at room temperature and on creep resistance, at 500°C of tanium grade 2. The creep rupture test was conducted based on ASTM 139-11 [19]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
