Effect of Compaction Pressure and Powder Grade on the Microstructure, Hardness and Surface Topography of Steam Oxidized Sintered Iron

  1. Prof. Dr. P. Neumann5,
  2. Dr. D. Allen6 and
  3. Prof. Dr. E. Teuckhoff7
  1. J. D. B De Mello1,4,
  2. R. Binder2,
  3. A. N. Klein3 and
  4. I. M. Hutchings1

Published Online: 5 JAN 2006

DOI: 10.1002/3527606181.ch44

Steels and Materials for Power Plants, Volume 7

Steels and Materials for Power Plants, Volume 7

How to Cite

De Mello, J. D. B., Binder, R., Klein, A. N. and Hutchings, I. M. (2000) Effect of Compaction Pressure and Powder Grade on the Microstructure, Hardness and Surface Topography of Steam Oxidized Sintered Iron, in Steels and Materials for Power Plants, Volume 7 (eds P. Neumann, D. Allen and E. Teuckhoff), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606181.ch44

Editor Information

  1. 5

    Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Germany

  2. 6

    ABB Asltom Power UK Ltd., Cambridge Road, Whetstone, Leicester LE9 GLH, United Kingdom

  3. 7

    Siemens AG, Postfach 3240, 91050 Erlangen, Germany

Author Information

  1. 1

    University of Cambridge, UK

  2. 2

    Embraco, Joinville, S.C., Brazil

  3. 3

    Labmat, UFSC, Florianópolis, S.C., Brazil

  4. 4

    Laboratório de Tribologia e Materiais, UFU, Uberlândia, M.G., Brazil

Publication History

  1. Published Online: 5 JAN 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301959

Online ISBN: 9783527606184

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Keywords:

  • steels for power plants;
  • materials for power plant;
  • effect of compaction pressure;
  • effect of powder grade;
  • micro structure;
  • hardness;
  • surface topography;
  • steam oxidized sintered iron

Summary

Steam oxidation has proved to be an effective process to improve the properties of sintered iron components. The wear processes of such surfaces might be expected to be influenced by the presence of pores, the extent of pore closure and the nature and morphology of the oxide produced. In this paper, the influence of compaction pressure and powder grade on the microstructure, oxide content, hardness and surface topography of steam treated sintered iron is analysed. Specimens prepared from atomised powders in different sizes were compacted using 4 different pressure, sintered and then subjected to a continuous steam treatment. A clear influence of the processing parameters on porosity was highlighted. Low porosity is always associated with high compaction pressure and greater powder size. Decreasing powder size always leads to high hardness. Samples produced with smaller powder size show a continuous decrease in hardness as the compaction pressure increases although for the large powder size there is a slight increase to a constant value of ultimate hardness. For the intermediate grain size a maximum hardness is obtained as the compaction pressure increases. X-ray diffraction shows that the oxide layer is composed of magnetite and haematite. No general correlation was found between topographic features, examined using vertical scanning interferometry, and processing parameters or microstructure.