5 documents found, page 1 of 1
Influence of the heat input and aging treatment on microstructure and mechanica...
Antunes, Paulo Costa; Silva, C.C.; Correa, E.O.; Tavares, Sérgio Souto MaiorIn this work, the effect of heat input and aging treatment on the microstructural characteristics and mechanical properties of similar AISI 317L austenitic stainless steel weldments used in the petroleum industry was investigated. The filler metal used was the AWS ER317L electrode at two different heat input levels (4 and 8 kJ/cm) in order to verify the influence of this parameter on the precipitation of delete...
Mechanical and phase transformation behaviour of biomedical Co-Cr-Mo alloy fabr...
Béreš, Miloslav; Silva, C.C.; Sarvezuk, Paulo Willian Carvalho; Wu, Leonardo; Antunes, Luiz Henrique Martinez; Jardini, André LuizBiomedical cobalt-chromium-molybdenum (Co-Cr-Mo) alloys have been used in the cast or wrought form as prosthetic implant materials for more than five decades. Recently, additive manufacturing techniques are employed to produce parts directly from metal precursor powder with a composition suitable for biomedical applications. In the work present, we examine both mechanical behaviour and γ→ε phase transformation ...
Morphological, structural, optical and dielectric properties of 91SiO 2:4Li2O:4...
Valente, M.A.; Peres, M.; Nico, C.; Monteiro, T.; Graça, M.P.F.; Sombra, A.S.B.; Silva, C.C.We report on the structural, morphological and optical characterization of glass and glass-ceramic samples, with nominal composition of 91SiO 2:4Li2O:4Nb2O5:1Dy2O 3 (% mole). The samples were heated treated in air in the temperature range between 500 °C and 800 °C. The glass-ceramics samples start to crystallize at temperatures above 600 °C and besides the SiO2 and LiNbO3 crystalline phases, sub micron DyNbO4 p...
Morphological, structural, optical and dielectric properties of 91SiO2:4Li2O:4N...
Valente, M.A.; Peres, M.; Nico, C.; Monteiro, T.; Graça, M.P.F.; Sombra, A.S.B.; Silva, C.C.We report on the structural, morphological and optical characterization of glass and glass-ceramic samples, with nominal composition of 91SiO2:4Li2O:4Nb2O5:1Dy2O3 (% mole). The samples were heated treated in air in the temperature range between 500 °C and 800 °C. The glass-ceramics samples start to crystallize at temperatures above 600 °C and besides the SiO2 and LiNbO3 crystalline phases, sub micron DyNbO4 pre...
Synthesis and optical properties of a lithium niobiosilicate glass doped with e...
Graça, M.P.F.; Valente, M.A.; Silva, C.C.; Peres, M.; Cruz, A.; Soares, M.J.; Neves, A.J.; Monteiro, T.The sol–gel method was used to prepare a lithium niobiosilicate glass doped with europium ions, 91SiO2–4Li2O–4Nb2O5–1Eu2O3 (% mole). The dried gel was heat-treated between 500 °C and 750 °C and glass ceramics were obtained. X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman studies show that crystallization starts at temperatures above 600 °C. The LiNbO3 and EuNbO4 nanocrystals were found in ...