Martensite
Mostrando 1-12 de 136 artigos, teses e dissertações.
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1. Influence of Nb Content on Sensitization and Pitting Corrosion of Welded AISI 430 Ferritic Stainless Steel
Resumo Neste trabalho, o efeito da adição de Nb na sensitização e corrosão por pite de aço inoxidável ferrítico AISI 430 submetido à soldagem TIG foi investigado por caracterização microestrutural e técnicas eletroquímicas. As três regiões distintas do processo de soldagem, zona fundida, zona termicamente afetada e metal de base do aço AISI
Soldag. insp.. Publicado em: 07/10/2019
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2. Mechanically Induced Martensitic Transformation of Hot Rolled and Annealed 304L Austenitic Stainless Steel at Room and Cryogenic Temperatures
The 304L austenitic stainless steel is susceptible to mechanically induced martensitic transformation from slightly above room temperature down to cryogenic temperatures. In this work, austenitic 304L steel produced by two different thermomechanical processes, hot rolling (HR) and cold rolling and annealing (CR/A), were subjected to martensitic transformatio
Mat. Res.. Publicado em: 30/09/2019
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3. An Alternative to Avrami Equation
This paper proposes an alternative to the Avrami equation capable of describing whole transformation curves with significant fitting-correlations. The model bears physically meaningful parameters which permit considering the initial transformation kinetics independently from the subsequent microstructural evolution. Data of martensite, bainite, recrystalliza
Mat. Res.. Publicado em: 30/09/2019
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4. Efeitos da variação da concentração de solução polimérica aquosa a base de PVP na têmpera de aço AISI 4140
RESUMO A têmpera é um tratamento térmico que tem como principal objetivo a elevação de dureza e resistência mecânica dos aços por meio da sua transformação microestrutural. O processo se baseia na elevação da temperatura do material até a austenitização, seguida do arrefecimento por meio da imersão em um fluido, a qual precisa ser rápida o s
Matéria (Rio J.). Publicado em: 16/09/2019
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5. Influence of Mechanical Cycling on Residual Strain in Superelastic Cu-Al-Be-Nb Alloys
The understanding of the stabilization mechanism of martensite used to obtain alloys with high hysteresis and the possibility of recovering this martensite (residual strain) by heating at temperatures higher than As and Af have been fundamental for application in bonding devices. One of the possibilities to enhance residual strain is through mechanical cycli
Mat. Res.. Publicado em: 15/07/2019
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6. Effect Of The Application Of Constant And Variable Temperatures at the Overaging Stage in the Mechanical Properties of Trip780 Steel
The effect of the application of constant temperatures (isothermal plateau) and variables (cooling ramp) during the overaging (OA) stage of the continuous annealing cycle in the microstructural characteristics and mechanical properties of a TRIP steel of the class of 780 MPa was investigated. It was simulated six overaging conditions in the equipment Gleeble
Mat. Res.. Publicado em: 15/07/2019
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7. Effects of Cold Rolling Deformation on Microstructure and Damping Capacity of a Fe-Mn-Cr-Co-Si Alloy
The microstructure evolution of Fe-19Mn-8Cr-1Co-0.2Si (wt.%) alloy and Fe-19Mn (wt.%) alloy during cold rolling and its effect on the damping capacity of the two alloys were investigated. It was shown that the damping capacity of the two alloys was enhanced significantly owing to the deformation-induced ε-martensite and stacking faults. The Fe-19Mn-8Cr-1Co-
Mat. Res.. Publicado em: 11/07/2019
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8. 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
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9. Mejora de la resistencia al desgaste abrasivo de un revestimiento Fe-Cr-Mn-C mediante la adición de V
ABSTRACT The aim of this work is to increase the abrasive wear resistance of a coating, applied on plates of AISI 1020 carbon steel, using tubular coated electrodes with the Fe-Cr-Mn-C alloy system. In order to achieve this increase, V was added to the alloy system. The resulting coating were studied using optical microscopy (MO), X-ray diffraction and micro
Matéria (Rio J.). Publicado em: 20/05/2019
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10. Avaliação da Adição de Ti, Nb e (Ti+Nb) na Microestrutura e Susceptibilidade à Sensitização de Aços Inoxidáveis Ferríticos Submetidos à Soldagem TIG
Resumo Neste estudo, a microestrutura e a resistência à corrosão intergranular de aços inoxidáveis ferríticos com adições de Nb, Ti e (Ti+Nb) submetidos à soldagem TIG foram investigadas. A caracterização estrutural dos cordões de solda foi realizada através de microscopias óptica (MO) e eletrônica de varredura (MEV) e espectroscopia por energ
Soldag. insp.. Publicado em: 16/05/2019
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11. Tensile Armor Wires Submitted to Slow Strain Rate Tests in a Corrosive Environment and Cathodic Protection: a Comparison Between Two Different Microstructures
Tensile armor in flexible pipes consists of two or more layers of steel wires. Damage to the outer sheath may cause ingress of seawater in the annular space and thus corrosion of the armor wires. This work focused on the susceptibility of these wires to stress corrosion cracking (SCC) and hydrogen embrittlement (HE) using a slow strain rate test (SSRT) under
Mat. Res.. Publicado em: 06/05/2019
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12. The Influence of Isothermal Holding Times on Microstructural Evolution of X90 Linepipe Steel
Microstructural phase of linepipe steels depends on different isothermal conditions. Thermal cycling testing of X90 linepipe steel was conducted using a thermomechanical simulator. The results have shown that with increased holding time, the microstructure constituents change from the martensite and bainitic ferrites to granular bainite and polygonal ferrite
Mat. Res.. Publicado em: 28/03/2019