Bainite Ferrite
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Behaviors of Embrittlement and Softening in Heat Affected Zone of High Strength X90 Pipeline Steels
Abstract The embrittlement and softening behaviors in heat affected zone of X90 pipeline steel were studied, and the influence of weld thermal cycle on microstructure and mechanical properties were discussed by combining the effect of peak temperature on the phase transition point (Ar3). Results show that there are embrittlement and softening zones existed i
Soldag. insp.. Publicado em: 15/08/2019
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2. 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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3. 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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4. 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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5. 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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6. 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
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7. Influence of Tungsten on Dry Sliding Wear Behaviour of Sintered/Hot Extruded P/M Alloy Steels (Fe-C-W-Ti)
In the present scenario, Powder Metallurgy (P/M) is an established manufacturing process used to make components of complex geometries with high strength and tolerances by using incredible materials which are difficult to melt or form by other processes. The mechanical properties and microstructures will determine the component characteristic dependent on th
Mat. Res.. Publicado em: 08/06/2017
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8. Influence of Niobium and Molybdenum on Mechanical Strength and Wear Resistance of Microalloyed Steels
The HSLA (High-Strength Low Alloy) steels are used in the production of pipes, flanges and connectors to build ducts for ore, oil and gas transport. The conventional processes are the rolling or forging. In the transport of ore and heavy oil, the abrasive particles impair the surfaces and reduce the pipelines lifetime. Therefore, besides the mechanical prope
Mat. Res.. Publicado em: 05/06/2017
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9. The Analysis of the Microstructure and Mechanical Properties of Low Carbon Microalloyed Steels after Ultra Fast Cooling
In this paper, two low carbon microalloyed steels, named as steel A and steel B, were fabricated by ultra fast cooling (UFC). In both steels, the microstructures containing quasi polygonal ferrite (QF), acicular ferrite (AF) and granular bainite (GB) can be obtained by UFC process. The amount of AF in steel B is more than that in steel A. The size and distri
Mat. Res.. Publicado em: 18/05/2017
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10. Phases quantification in DP600 steel welded by GTAW process using SEM and atomic force microscopy
The automotive industry is constantly under several challenges in many aspects, such as development of new materials and improvement their manufacturability. In order to achieve light weight, reduced emissions and ensure conductor safety, advanced high strength steels (AHSS) are able to fulfill these requirements. Dual phase steels (DP) are well suited for l
Mat. Res.. Publicado em: 20/02/2017
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11. Microstructure Evolution and Creep Properties of 2.25Cr-1Mo Ferrite-Pearlite and Ferrite-bainite Steels After Exposure to Elevated Temperatures
2.25Cr-1Mo steels are widely used in thermoelectric power plants. Under operational temperatures, their properties degrade due to microstructural changes related to carbide coalescence and stoichiometric transformations. The extent of such microstructural changes is controlled by stress, temperature and time. Therefore, these factors can be used to evaluate
Mat. Res.. Publicado em: 26/01/2017
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12. Residual Stress, Microstructure and Hardness of Thin-Walled Low-Carbon Steel Pipes Welded Manually
The aim of this work is to evaluate the welding residual stress profile in ASTM A106 Gr. B steel pipes with 4" diameter and to correlate this profile with the microstructure and hardness of the joint. The results showed that the residual stresses are more uniform for a lower welding heat input. Higher welding heat input causes not only a non-uniformity of th
Mat. Res.. Publicado em: 29/09/2016