In the present study, poly (ethylene terephthalate)-based composites were produced and characterized. These composed by terephthalate) (PET) reinforced with geopolymer concrete waste (GCW). Both untreated (U-GCW) treated oleic acid (OA) (T-GCW) used in production of composites. The PET/GCW ratios for either or GCW bodies 80/20 (wt%), 60/40 (wt%) 50/50 (wt%). Chemical compositions assessed X-ray fluorescence spectroscopy (XRF), crystallinity differential scanning calorimetry (DSC), thermal...

In this work, the damage behavior of cold-rolled zinc-coated dual-phase steel sheets 600 and 800 grades was evaluated by means standard uniaxial tensile testing, microstructural characterization finite element modeling. The void formation in both steels investigated as a function plastic strain level from digital image processing scanning electron micrographs to quantify average size determine corresponding measures density, area fraction aspect ratio. Based on analysis experimental test...

Este trabalho apresenta um estudo da cinética de reversão martensita (α’) em austenita (g) durante o recozimento a 750 ºC com tempos distintos (1, 5, 10 e 15 minutos) do aço inoxidável austenítico ASTM 201LN, partir condição laminada frio à temperatura ambiente. As análises quantificação fase foram realizadas utilizando os resultados Difração Raios X (DRX) aplicando método refinamento Rietveld confronto somatório das áreas dos picos DRX fases identificadas análise ferritoscopia. Além disso,...

The automotive industry has experienced rapid growth, with lightweight materials becoming a significant research focus. Among these materials, low-density Fe-Mn-Al-C alloys show promise for this kind of application. To optimize the hot workability parameters practical applications, it is essential to explore deformation behavior alloys. In study, we investigated alloy Fe-0.77Mn-7.10Al-0.45C-0.31Nb using plane-strain compression tests several temperatures (850, 950, 1050, and 1150 °C) nominal...

Zn-Ni-Fe co-deposits were obtained on a low carbon steel with and without ascorbic acid (AA) in solution compared to Zn-Ni by electrochemical experiments. After the spontaneous oxidation of Fe2+ Fe3+ subsequent Fe(OH)3 formation, tests performed verify effects this transformation co-deposition process. The other containing AA was prepared avoid obtain Zn-Ni-Fe, however, organic compound also influenced electrodeposition due complexation metal cations adsorption cathodic surface....

Abstract The development of dislocation structures associated with work hardening stages and dynamic strain aging (DSA) is investigated in an AISI 301 austenitic stainless steel plastically deformed tension at 500 600 °C. In the first stage, up to 22% plastic 500 °C 18% 600 °C, incipient cells begin be formed are observed association {1 0 0} TEM diffraction pattern. At transition point from second well consolidated a maximum density typical DSA steels. sharp decrease rate after discloses...

The present study shows a comparison between two sintering processes, microwave and conventional sintering, for the manufacture of NiTi porous specimens starting from powder mixtures nickel titanium hydrogenation-dehydrogenation (HDH) milled by mechanical alloying short time (25 min). samples were sintered at 850 °C 15 min 120 min, respectively. Both exhibited porosity, pore size results are within range human bone. intermetallic compound (B2, R-phase, B19') was detected in both through...

RESUMO No setor automotivo as ligas de alumínio têm se destacado por sua atraente combinação entre resistência/peso, outras características. As da série 5XXX tem seu ganho resistência mecânica através processos deformação a frio, e propriedades mecânicas das estão diretamente relacionadas à composição ao processo fabricação utilizado em manufatura. Um dos requisitos para otimizar operações conformação é o controle microestrutura textura. Neste trabalho, AA 5052 5050C, produzidas Fundição...

RESUMO A manufatura aditiva (AM) é utilizada para a otimização do processo produtivo, em especial, fabricação de peças com geometrias complexas. Dentre as diversas técnicas AM, Fusão Seletiva Laser (FSL) uma das mais utilizadas. Diversas ligas podem ser empregadas nesse tipo produtivo. liga Ti6Al4V amplamente por reunir um gama características que permitem aplicação várias áreas. As Ti α + β são largamente utilizadas na indústria aeroespacial, área médica e odontológica. O rápido...

This work studies the microstructural characteristics and mechanical properties for different aluminium alloys (1100, 3104 8011) hot rolled sheets that were subjected to a solution heat treatment with distinct soaking times, in order promote changes on these solute fractions slightly above maximum solubility limit.Scanning Electronic Microscopy (SEM) / Energy Dispersive Spectroscopy X-Ray (EDS), Diffraction (XRD) Hardness Tests employed observe compositional evaluation.For 1100 8011 more...

A comparison between the Zn-Ni, Zn-Ni-Fe and Zn-Ni-Co coatings was performed in this study. The co-deposition process obtained by electrodeposition on ASTM A624 steel using sulphate baths acid media low current density. characterization of Inductively Coupled Plasma Optical Emission Spectroscopy (ICP OES), Energy Dispersive (EDS), X-ray diffraction (XRD) Anodic Linear Sweep Voltammetry (ALSV) allowed a detailed analysis phases formed its amounts coatings, which enabled to verify influence Fe...

In this work, the residual stress study by XRD was carried out after martensitic transformation of a 304L steel subjected to plastic strain rolling and tensile test, at room cryogenic temperatures. This article intents contribute with understanding stresses generated induced deformation due its complexity. From experimental conditions employed, it possible obtain high martensite volumetric fraction observe influence existing phases on performance measurements. general, compressive observed...

The metastable 304L austenitic stainless steels are susceptible to phase transformation induced by plastic deformation. traditional metallographic preparation, via mechanical methods, introduces superficial deformation from grinding and polishing. It is important evaluate this effect on the results of quantitative analysis martensite formed in similar alloys. In work, was a tensile test at room temperature with two different rates order provide distinct structural conditions for proposed...

The present study conducted for the first time a life prediction based on numerical analysis of creep deformation and fracture behavior results special notched specimens AISI 310 steel. For this purpose, flat with double edge notch were tested under stress is 225, 160 100 MPa at temperatures 700, 675 650 °C. Then it was analyzed material through observational analysis. Furthermore, Q* parameter used to establish novel predication equation curves characteristic experiment, strong influence in...

The influences of temperature and chloride content on the corrosion resistance stainless steels (SS) in acid solution were investigated employing polarisation curves (PC) electrochemical impedance spectroscopy measurements. Although duplex SS presented a higher pitting equivalent number than that 316L SS, PC for containing 250 ppm ions showed surprisingly large positive hysteresis loop, suggesting there was damage to passive film caused by localised intergranular at 120oC. In contrast, it...

Reducing pollutant emissions and improving safety standards are primary targets for modern mobility improvement. To meet these needs, the development of low-density steels containing aluminum is a new frontier research automotive applications. Low-density Fe-Mn-Al-C alloys promising. In this regard, an alloy with high content niobium addition belonging to system was evaluated understand possible phase transformations thus obtain transformation diagram by continuous cooling help future...