Materiais Avançados

Abstract: The quantification of rare earth elements in (Nd-Pr)-FeB alloys used in the production of super magnets is required to ensure the quality of the raw material and a final product with suitable properties. Laser-induced breakdown spectroscopy is attractive to this aim by avoiding the need for decomposition of the Leia mais…

Abstract: This study delves into the formulation of an advancedmicrostructure in medium-carbon high silicon spring steel through a series of engineered heat treatments. The microstructure, composed of lower bainite, proeutectoid ferrite, and pearlite, exhibits superior mechanical properties compared to traditional pearlitic steel. Specifically, the novelmicrostructure yields a strength of 870 Leia mais…

Abstract: In a world in which vehicles of higher energy efficiency have constantly been pursued, the development of multi-material structures can be extremely interesting as far as structural weight reduction and the mitigation of greenhouse gas emissions are concerned. This paper evaluates basic mechanical properties of vehicular structural joints between Leia mais…

Abstract: This study investigates the phase transformations and microstructural development of SAE 9254 steel subjected to various heat treatments aimed at achieving a combination of bainitic, martensitic, and retained austenitic phases. The critical austenitization and quenching temperatures, along with the holding times, were determined using a dilatometer to observe the Leia mais…

Resumo: Jato-ventiladores são equipamentos de ventilação forçada utilizados em ambientes em que pode ocorrer acúmulo de gases tóxicos. Eles são utilizados em túneis rodoviários e estacionamentos para a diluição das concentrações de CO ou de NO2 formados com os gases de combustão. Foi conduzida uma análise de falha em três Leia mais…