Volumetric Fraction
Mostrando 1-12 de 54 artigos, teses e dissertações.
-
1. On the effect of interrupted ageing (T6I4) on the mechanical properties of AA6351 and AA7050 alloys
Abstract The mechanical properties of age-hardenable aluminum alloys are strongly influenced by the volume fraction, size and spacing of hardening precipitates. In addition, researches have shown that interrupted ageing (T6I4) could benefit the hardening response of these alloys. Interrupted ageing is a term generally used for the microstructural developmen
REM, Int. Eng. J.. Publicado em: 2021-01
-
2. Influence of Molybdenum on Microstructure and Pitting Corrosion Behavior of Solution-Treated Duplex Stainless Steel in a Lithium Chloride Solution
With technological advances in the several areas of knowledge, the constant search for materials with characteristics that meet certain applications has been growing, especially in the chemical and petrochemical industries, where materials capable of withstanding the conditions of corrosion in aggressive environments are required. The aim of this paper was t
Mat. Res.. Publicado em: 24/10/2019
-
3. Influência de interfases sobre a condutividade térmica efetiva de compósitos periódicos reforçados por fibras
RESUMO Os materiais compósitos comumente apresentam delgadas regiões ou interfases localizadas entre a matriz e as inclusões. Estas interfases têm influência no comportamento efetivo do compósito. Em diversas aplicações, os compósitos estão sujeitos a variações significativas de temperatura e, consequentemente, a condutividade térmica efetiva de
Matéria (Rio J.). Publicado em: 16/09/2019
-
4. Microstructural Evolution Due to One Thermal Cycle in a Superduplex Stainless Steel ASTM A890/A890M - Grade 6A in the As-Weld and Post-Weld Heat Treatment Conditions
During welding of the superduplex stainless steels are exposed to thermal cycles, allowing precipitation of deleterious phases as well as unbalance as the ferrite and austenite phases. This work analyzed the microstructural changes taking place on a plate ASTM A890/A890M - grade 6A steel submitted to arc welding one welding of pass conducted on a flat surfac
Mat. Res.. Publicado em: 08/08/2019
-
5. Efeito da taxa de resfriamento sobre a formação de martensita em um aço inoxidável ferrítico com 11 %Cr e baixos teores de intersticiais
RESUMO Estudou-se o efeito da taxa de resfriamento sobre a cinética de formação da martensita e sua evolução microestrutural em um aço inoxidável ferrítico com 0,011 %C - 11,1 %Cr - 0,013 N, usando a técnica de dilatometria e a microscopia ótica. Amostras foram austenitizadas a 1000°C por um minuto, seguida de resfriamento sob várias taxas até a
Matéria (Rio J.). Publicado em: 20/05/2019
-
6. EQUAÇÕES LINEARES E NÃO LINEARES PARA PREVER O COMPORTAMENTO DE PROPRIEDADES FÍSICO-QUÍMICAS DE COMBUSTÍVEL DE AVIAÇÃO MISTURADO COM BIOQUEROSENE DROP-IN ALTERNATIVO
Density, viscosity and calorific values are important physical properties to affect the utilization of biofuel. In this work, mixtures of farnesane and a “jet fuel”, QAv-1, were used to study the variation of density and kinematic viscosity as a function of the volumetric fraction of farnesane and temperature. Experimental measurements were carried out f
Quím. Nova. Publicado em: 2019-01
-
7. Influence of the Fraction of Comonomers and Diluents on the Preparation of Polymeric Microspheres Based on Poly (Methacrylic acid-co-divinylbenzene) Obtained by Precipitation Polymerization
Abstract Preparation and characterization of polymeric microspheres based on poly(methacrylic acid-co-divinylbenzene) (P(MAA-co-DVB)) by precipitation polymerization are reported. The influence of the change in comonomer composition, crosslinking degree, ratio of total monomers/diluents by weight/volume (g/100 mL) and the volume ratio of diluents were studie
Mat. Res.. Publicado em: 20/12/2018
-
8. Aqueous Nanofluids Based on Copper MPA: Synthesis and Characterization
The application and use of efficient cooling fluids have become increasingly important due to the increasing industrial and energy demand associated with the miniaturization of various electronic devices. The search for high-efficiency heat exchanger fluids in the early 1990s led to the development of a new class of refrigerants called nanofluids. The use of
Mat. Res.. Publicado em: 11/01/2018
-
9. Sigma Phase in Superduplex Stainless Steel: Formation, Kinetics and Microstructural Path
The superduplex stainless steels (SDSS) are widely used in chemical, oil and gas industries, to pipelines and storage material facilities. In welding process or working in temperature elevated, secondary phases may appear in the form of precipitates, as the sigma phase (σ) which is an intermetallic compound. This compound is harmful to the properties of ste
Mat. Res.. Publicado em: 09/01/2017
-
10. Investigating the Provenance of Iron Artifacts of the Royal Iron Factory of São João de Ipanema by Hierarchical Cluster Analysis of EDS Microanalyses of Slag Inclusions
Microstructural characterization techniques, including EDX (Energy Dispersive X-ray Analysis) microanalyses, were used to investigate the slag inclusions in the microstructure of ferrous artifacts of the Royal Iron Factory of São João de Ipanema (first steel plant of Brazil, XIX century), the D. Pedro II Bridge (located in Bahia, assembled in XIX century a
Mat. Res.. Publicado em: 24/11/2016
-
11. Potencialidades computacionales del Método de los Elementos Finitos para la modelación y simulación de materiales compuestos: revisión
This work presents a review of computational models that use the Finite Elements Method (FEM) for the study of composite materials mechanical behavior, focusing the analysis in materials reinforced by particles or fibers. Bibliographic analysis shows that using FEM it is possible to successfully estimate the effect on the composites mechanical properties, of
Matéria (Rio J.). Publicado em: 2015-06
-
12. Síntesis de hidrogeles termosensibles de poli(N‑isopropilacrilamida)-co-poli(N,N,-dimetilacrilamida)
In this paper we copolymerized N-isopropylacrylamide (NIPA) with N, N, dimethylacrylamide (DIMA). The increase in the proportion of DIMA added resulted in a proportional increase over the transition temperature, as well as on the ability of samples to absorb water. An increase in the DIMA concentration also reduced the volumetric fraction and the rate of wat
Polímeros. Publicado em: 19/04/2013