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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Ductility improvement due to martensite alpha ` decomposition in porous Ti-6Al-4V parts produced by selective laser melting for orthopedic implants

Texto completo
Autor(es):
Sallica-Leva, E. [1] ; Caram, R. [1] ; Jardini, A. L. [2] ; Fogagnolo, J. B. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Sch Mech Engn, RuaMendeleiev 200, BR-13083860 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Sch Chem Engn, Ave Albert Einstein 500, BR-13083852 Campinas, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 54, p. 149-158, FEB 2016.
Citações Web of Science: 48
Resumo

Ti-6Al-4V parts obtained by selective laser melting typically have an acicular alpha' martensitic microstructure whose ductility is low. Thus, post-heat treatments are useful for increasing ductility. In this work, the effects of sub-beta-transus heat treatments on the mechanical properties of Ti-6Al-4V parts with porous structures are correlated with martensite alpha' phase decomposition. The precipitation of beta phase and the gradual transformation of alpha' into alpha phase by the diffusion of excess vanadium from alpha' to beta phase are proposed to be the main events of martensite alpha' phase decomposition in parts fabricated by selective laser melting. The heat treatment performed at 650 degrees C for 1 h produced no microstructural changes, but the samples treated for at the same temperature 2 h showed alpha fine precipitation of beta phase along the alpha' needle boundaries. The heat treatment performed at 800 degrees C for 1 or 2 h produced alpha fine alpha+beta microstructure, in which beta phase are present as particles fewer in number and larger in size, when compared with the ones present in the sample heat-treated at 650 degrees C for 2 h. Heat-treatment of the parts at 800 degrees C for 2 h proved to be the best condition, which improved the ductility of the samples while only slightly reducing their strength. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 11/19982-2 - Formação de ligas de titânio-nióbio e titânio-molibdênio na superfície por laser com adição de pós de nióbio e molibdênio
Beneficiário:João Batista Fogagnolo
Linha de fomento: Auxílio à Pesquisa - Regular