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Thermal characteristics of spring steels used in railway bogies

Authors
  • Matjeke, Velaphi Jeffrey1
  • Van Der Merwe, Josias Willem1
  • Mukwevho, Goodness2
  • Phasha, Maje Jacob2
  • 1 University of the Witwatersrand (Wits), School of Chemical and Metallurgical Engineering, Johannesburg, 2050, South Africa , Johannesburg (South Africa)
  • 2 Transnet Engineering, Research and Development, Pretoria, 01272, South Africa , Pretoria (South Africa)
Type
Published Article
Journal
SN Applied Sciences
Publisher
Springer International Publishing
Publication Date
Nov 05, 2019
Volume
1
Issue
12
Identifiers
DOI: 10.1007/s42452-019-1546-5
Source
Springer Nature
Keywords
License
Yellow

Abstract

During the heat treatment of springs for railway bogies, phase transformations and oxidation occur and it is important to know transformation temperatures and oxidation rates to optimise the process. Oxidation and decarburisation can adversely affect the surface properties of steel when not limited to the bare minimum. The oxidation rates and material-specific phase transformation of the spring steels were evaluated by means of differential scanning calorimetry. Three spring steels with known mass were heated and cooled. The change in the corresponding heat flow was evaluated. The materials were also subjected to a regular spring steel heat treatment process in order to determine the relationship between oxidation rate and decarburisation. This allowed for the observation of phase transition and oxidation rate for each steel. The results of these investigations showed that there is a nonlinear relationship between oxidation and decarburisation. The three materials analysed showed distinct properties; therefore, understanding of the material characteristics is important. Material A showed a high oxidation rate with decreased decarburisation, whereas material B showed less oxidation and higher decarburisation due to higher silicon contents.

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