Characteristics of Nano Grain Structure in SPD-PM Processed AISI304L Stainless Steel Powder

  1. Prof. Dr. Michael Zehetbauer4 and
  2. Prof. Ruslan Z. Valiev5
  1. H. Inomoto1,
  2. H. Fujiwara2 and
  3. K. Ameyama3

Published Online: 28 JAN 2005

DOI: 10.1002/3527602461.ch10f

Nanomaterials by Severe Plastic Deformation

Nanomaterials by Severe Plastic Deformation

How to Cite

Inomoto, H., Fujiwara, H. and Ameyama, K. (2004) Characteristics of Nano Grain Structure in SPD-PM Processed AISI304L Stainless Steel Powder, in Nanomaterials by Severe Plastic Deformation (eds M. Zehetbauer and R. Z. Valiev), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527602461.ch10f

Editor Information

  1. 4

    Institut für Materialphysik, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria

  2. 5

    Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marks Str., Ufa, 450 000, Russia

Author Information

  1. 1

    Ritsumeikan University, Kusatsu, Shiga, Japan

  2. 2

    Department of Environmental Systems Engineering, Kochi University of Technology, Tosayamada, Kochi, Japan

  3. 3

    Department of Mechanical Engineering, Ritsumeikan University, Kusatsu, Shiga, Japan

Publication History

  1. Published Online: 28 JAN 2005
  2. Published Print: 25 FEB 2004

ISBN Information

Print ISBN: 9783527306596

Online ISBN: 9783527602469

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Keywords:

  • characteristics of nano grain structure;
  • AISI304L stainless steel powder;
  • grain refinement;
  • severe plastic deformation (SPD);
  • accumulative roll bonding (ARB);
  • equal channel angular process (ECAP);
  • high pressure torsion (HPT);
  • severe plastic deformation – powder metallurgy (SPD-PM);
  • powder metallurgy process;
  • microstructural changes

Summary

Grain refinement is very effective for improving mechanical properties as well as the workability of materials. There are some severe plastic deformation processes used to produce nanocrystalline materials, such as ARB (Accumulative Roll Bonding) [1], ECAP (Equal Channel Angular Process) [2], HPT (High Pressure Torsion) [3] and SPD-PM (Severe Plastic Deformation – Powder Metallurgy) Process [4]. The SPD-PM process is a novel powder metallurgy process combining Mechanical Milling (MM), Mechanical Alloying (MA), heat treatment and sintering processes. It enables one to produce a nano grain structure quite easily. However, the formation of nanocrystalline grains in the SPD-PM process is not very well understood. The main reason is that MM powder can coalescence easily and deform in a complicated manner during MM. The objective of the present paper is to clarify the mechanisms of nano grain formation and the phenomena which accompany the grain refinement in AISI304L austenitic stainless steel. To reveal the microstructural changes during MM process, a comparatively large powder of about 0.9mm diameter is used, and reduced MM energy was provided.