Effect of the cooling rate on the microstructure of directionally solidified casting (CMSX-4 Ni superalloy)

Abstract: This study investigates the impact of the cooling rates, from 18 to 1.5 °C/s, on the as-cast microstructure of the CMSX-4 Ni-based superalloy, especially on morphological changes in primary γ′ precipitates in the dendrite core and border. Microstructural characterization along the height of directionally solidified samples included the measurement Leia mais…

Development of oxalate-based layers for temporary protection of NdFeB magnets

Abstract: Conservation of natural resources is the basis of sustainability, which aims to achieve a balance between the resources and economic activity, and, in this context, the use of NdFeB-based magnets mainly enables sustainable power generation in particular. These magnetic alloys are susceptible to corrosion and require protection. This study Leia mais…

Influência da temperatura na corrosão influenciada por microorganismos em aço-carbono (AISI 1020) sob condição estática

Resumo: O presente estudo avaliou a influência da temperatura na corrosão influenciada por microrganismos (CIM) sob condição estática e anaeróbica (~10 ppb) por um período de 45 dias. Os ensaios foram realizados em biorreatores e como meio foi utilizado água do mar natural esterilizada e enriquecida com solução nutritiva, em Leia mais…

Effect of the cooling rate on the microstructure of directionally solidified casting (CMSX-4 Ni superalloy)

Abstract: This study investigates the impact of the cooling rates, from 18 to 1.5 °C/s, on the as-cast microstructure of the CMSX-4 Ni-based superalloy, especially on morphological changes in primary γ′ precipitates in the dendrite core and border. Microstructural characterization along the height of directionally solidified samples included the measurement Leia mais…

Fatigue behaviour of additive manufactured Nb-48Ti alloy parts from powders produced by plasma atomazation (PA) and hydride-dehydride (HDH) process

Abstract: Fatigue behaviour of bcc Nb-48 wt%Ti (Ti-36at%Nb) alloy parts processed by Laser Powder Bed Fusion (L-PBF) using as raw material two different types of powders, spherical powder produced by Plasma Atomization (PA) and irregularly shaped powder produced by Hydride-Dehydride (HDH) process, are compared. Laser power and scanning speed were Leia mais…

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