MATEC Web Conf.
Volume 165, 201812th International Fatigue Congress (FATIGUE 2018)
|Number of page(s)||6|
|Section||High Cycle Fatigue, Fatigue at Notches|
|Published online||25 May 2018|
Fatigue behavior of Ti-6Al-4V alloy modified by plasma immersion ion implantation: temperature effect.
Faculdade de Engenharia de Guaratinguetá – FEG/UNESP, Materials and Technology Department, Fatigue and Aeronautical Materials Research Group, Av. Ariberto Pereira da Cunha 333, Brazil
2 Universidad Nacional de Ingeniería – UNI, Faculty of Mechanical Engineering, Av. Túpac Amaru 210, Peru
3 Instituto Nacional de Perquisas Especiais – INPE, Associated Laboratory of Plasmas, Av. dos Astronautas 1758, Brazil
4 Escola de Engenharia de Lorena – EEL/USP, Materials Department, Pólo-Urbo Industrial Gleba AI-6, Brazil
* Corresponding author: email@example.com
This research studied Ti-6Al-4V alloy behavior with two (2) different microstructure subjected to nitrogen addition by PIII treatment, with and without sample heating, under cyclic load. PIII conditions, at 390 °C, were DC voltage of 9.5 kV, frequency of 1.5 kHz and pulse of 40 μs. PIII conditions, with sample heating at 800 °C, were 7 kV, 0.4 kHz and 30 μs. Axial fatigue tests were performed on untreated and treated samples for resistance to fatigue comparison. The untreated Ti-6Al-4V had an annealed microstructure, PIII treatment at 390 °C resulted in a microstructure that has no nitride layer or diffusion zone. In the PIII treatment at 800 °C, the microstructure presented nitride layer and diffusion zone. Resistance to fatigue decreased with PIII treatments in both temperatures. At 390 °C, the treatment created deformation regions and cracks on surface due to nitrogen implantation that formed solid solution with titanium and imposed lattice strains on the crystal lattice. At 800 °C, bulk ductility decrease, increasing of αTi proportion in microstructure due to α case formation and the presence of a ceramic layer dropped fatigue resistance of Ti-6A-4V alloy.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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