Ferrite
Mostrando 25-36 de 233 artigos, teses e dissertações.
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25. 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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26. Zinc Ferrite Nanoparticles via Coprecipitation Modified Method: Glycerol as Structure Directing and Stabilizing Agent
Coprecipitation is one of the most practical methods used to synthesize ferrite nanoparticles. Fine characteristics of these materials can be improved by means of a series of modifications in the synthesis method. In this paper we present a study of influence of glycerol as structure directing and stabilizing agent in the synthesis of zinc ferrite nanopartic
J. Braz. Chem. Soc.. Publicado em: 2019-04
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27. 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
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28. Effect of sulfate on the pitting potential of austenitic stainless steels 18Cr8Ni and 17Cr6Mn5Ni in chloride media
Abstract Pitting corrosion resistance of two austenitic stainless steels, 18Cr8Ni (Type 304L or UNS S30403 stainless steel) and 17Cr6Mn5Ni, was evaluated in three electrolytic solutions containing a fixed concentration of 0.6M sodium chloride and different additions of sodium sulfate, 0.06M, 0.15M or 0.6M. Cyclic potentiodynamic polarization tests were perfo
REM, Int. Eng. J.. Publicado em: 2019-03
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29. Investigation of Stress Corrosion Cracking of Austenitic, Duplex and Super Duplex Stainless Steels under Drop Evaporation Test using Synthetic Seawater
Abstract Stress corrosion cracking (SCC) of UNS S31603 austenitic stainless steel (ASS), UNS S32205 duplex stainless steel (DSS) and UNS S32750 super duplex stainless steel (SDSS) was investigated. SCC tests were carried out at 110 ºC for 500 h under drops of synthetic seawater (DET, drop evaporation test). Two loading conditions were investigated: 50 % and
Mat. Res.. Publicado em: 31/01/2019
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30. Intercritical Heat Treatment Temperature Dependence of Mechanical Properties and Corrosion Resistance of Dual Phase Steel
Abstract This study investigated the effect of intercritical heat treatment temperature on the tensile properties, work hardening and corrosion resistance of dual phase steel. Ferrite-martensite dual phase steel with different martensite volume fractions were obtained after heat treatment at different intercritical temperatures. Microstructure, mechanical pr
Mat. Res.. Publicado em: 17/01/2019
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31. Catalytic Ozonation of Melanoidin in Aqueous Solution over CoFe2O4 Catalyst
In this work, cobalt ferrite (CoFe2O4) was synthesized by solvothermal route for application as a catalyst in the ozonation reaction for the decolorization and mineralization of melanoidin from aqueous solution. The structural properties of CoFe2O4 sample were investigated by X-ray diffraction (XRD), nitrogen adsorption-desorption isotherms, Fourier-transfor
Mat. Res.. Publicado em: 08/11/2018
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32. 3D Microstructural Finite Element Simulation of Martensitic Transformation of TRIP Steels
Abstract In this paper the effects of deformation modes on martensitic transformation for TRIP steels which are composed of Ferrite, Bainite and Retained austenite are investigated in the view of the microstructural level. For this porpose the simulations are run for a synthetically generated microstructure which have 55% Ferrit, 35% Bainite and 10% Retained
Lat. Am. j. solids struct.. Publicado em: 30/07/2018
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33. Analysis of the Crystallographic Microtexture of a UNS S32205 and a UNS S32304 Duplex Stainless Steels After Cold Rolling and Heat Treatment
Samples of duplex stainless steel 32205 (standard duplex) and 32304 (lean duplex) were investigated in the as-received state, cold rolling (with thickness reduction of 64 % and 62 % respectively) and after annealing at 1055ºC for 20 s soaking. Crystallographic microtexture was obtained via Electron BackScatter Diffraction (EBSD) technique. The results showe
Mat. Res.. Publicado em: 26/07/2018
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34. Análisis comparativo en la determinación de ferrita delta para aceros inoxidables austeníticos
ABSTRACT In the welding of austenitic stainless steels, the determination of delta ferrite (δ-ferrite) is very important to assess the susceptibility of weld metal to hot cracking, one of the major problems related to weldability, metallurgical and mechanical behavior of this type of steels. The determining δ-ferrite in the weld metal can be performed with
Matéria (Rio J.). Publicado em: 19/07/2018
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35. Determinación de los parámetros de austenización intercrítica para el desarrollo de aceros multifásicos mediante análisis dilatométrico
ABSTRACT The Multiphase steels are materials with exceptional mechanical properties including high strength, excellent ductility and hardening coefficient and good conformability. These properties are related with the microstructure, which can be a combination of ferrite and martensite (Dual phase steels) or more complex microstructures with ferrite, bainite
Matéria (Rio J.). Publicado em: 19/07/2018
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36. Estabilidad de la austenita retenida bajo condiciones de deformación en aceros multifásicos con bainita nanoestructurada
ABSTRACT A steel with nominal composition 0.25C, 1.9Si, 0.63Mn, 1.5Cr was manufactured using an induction furnace. The as-cast alloy was homogenized and the temperatures of austenite start (AC1) and finish (AC3) during heating were determined by dilatometric analyses. Two intercritical austenitization temperatures were selected, which were used to perform pa
Matéria (Rio J.). Publicado em: 19/07/2018