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		<doi>10.1051/matecconf/201816514001</doi>
		<issn>2261-236X</issn>
		<label>lattes: 7698697775899601 5 VellosoNoTaCiOlBaVo:2018:TeEf</label>
		<citationkey>VellosoNoTaCiOlBaVo:2018:TeEf</citationkey>
		<title>Fatigue behavior of Ti-6Al-4V alloy modified by plasma immersion ion implantation: temperature effect</title>
		<year>2018</year>
		<typeofwork>conference paper</typeofwork>
		<secondarytype>PRE PI</secondarytype>
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		<author>Velloso, Verônica,</author>
		<author>Nozaki, Leonardo,</author>
		<author>Tapia, Diego,</author>
		<author>Cioffi, Maria Odila,</author>
		<author>Oliveira, Rogério de Moraes,</author>
		<author>Barboza, Miguel,</author>
		<author>Voorwald, Herman,</author>
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		<group>LABAP-COCTE-INPE-MCTIC-GOV-BR</group>
		<affiliation>Universidade Estadual Paulista (UNESP)</affiliation>
		<affiliation>Universidade Estadual Paulista (UNESP)</affiliation>
		<affiliation>Universidad Nacional de Ingeniería (UNI)</affiliation>
		<affiliation>Universidade Estadual Paulista (UNESP)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Universidade de São Paulo (USP)</affiliation>
		<affiliation>Universidade Estadual Paulista (UNESP)</affiliation>
		<electronicmailaddress>veronicamcaoliveira@gmail.com</electronicmailaddress>
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		<electronicmailaddress>rogerio.oliveira@inpe.br</electronicmailaddress>
		<journal>Matec Web of Conferences</journal>
		<volume>165</volume>
		<pages>e14001</pages>
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		<abstract>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 &#945;Ti proportion in microstructure due to &#945; case formation and the presence of a ceramic layer dropped fatigue resistance of Ti-6A-4V alloy.</abstract>
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		<language>en</language>
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