Paper Titles

Modelling Mass Transference and Two-Directions Diffusion Coefficients in an Ellipse-Shaped Body under Multi-Factor and Un-Steady Conditions
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Effect of Alloy Elements in Time Temperature Transformation Diagrams of Railway Wheels
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Design and Fabrication of the Bidirectional Micro-Optic Concentrator for Optical Radiation
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Water Absorption Curves versus Gamma-Ray Attenuation Profiles: A Comparative Analysis of Hygric Permeance Results
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Transport Modelling of Multi-Phase Fluid Flow in Porous Media for Enhanced Oil Recovery
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Heat Transfer in Fixed Bed Elliptic Cylindrical Reactor via Two-Phase Model
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On the Modeling of Drying Process in an Industrial Tunnel Dryer
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Development of the Chromium-Rich High-Speed Steel: As-Cast Microstructure
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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 400Effect of Alloy Elements in Time Temperature...

Effect of Alloy Elements in Time Temperature Transformation Diagrams of Railway Wheels

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Abstract:

The Heavy-Haul railroad wheels started to use higher wear resistance steels microalloyed with niobium, vanadium, and molybdenum [1]. During continuous cooling, these elements depress the temperature of the pearlite formation, producing smaller interlamellar spacing that increases the hardness of the steel, besides to favor the precipitation hardening through the formation of carbides [2, 3]. Also, they delay the formation of difusional components like pearlite and bainite during isothermal transformation. The effects of these alloy elements on microstructure during isothermal transformation were studied in this work using a Bähr 805A/D dilatometer. Three different compositions of class C railway wheels steels (two microalloyed and one, non microalloyed) were analyzed in temperatures between 200 and 700 °C. The microstructure and hardness for each isothermal treatment were obtained after the experiments. Comparing with non microalloyed steel (7C), the vanadium addition (7V steel) did not affect the beginning of diffusion-controlled reactions (pearlite and bainite), but delayed the end of these reactions, and showed separated bays for pearlite and bainite. The Nb + Mo addition delayed the beginning and the ending of pearlite and bainite formation and also showed distinct bays for them. The delays in diffusion-controlled reactions were more intense in the 7NbMo steel than in 7V steel. The V or Nb + Mo additions decreased the start temperature for martensite formation and increased the start temperature for austenite formation.

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Periodical:

Defect and Diffusion Forum (Volume 400)

Pages:

11-20

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.400.11

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Online since:

March 2020

Authors:

A.B. Rezende, F.M. Fernandes, S.T. Fonseca, P.F.S. Farina, H. Goldenstein, Paulo Roberto Mei*

Keywords:

Bainite, Microalloyed Steel, Niobium, Railway Wheels, TTT Diagrams, Vanadium

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* - Corresponding Author

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