Paper Title:
Anomalous Property Evolution during Annealing in HPTed SUS 304 Austenitic Stainless Steel
  Abstract

SUS 304 austenitic stainless steel (ASS) was deformed by high pressure torsion (HPT) to obtain 100% volume fraction of martensite (α') from a fully austenitic (γ) matrix. Deformation caused an increase in hardness (Hv) from 1.6 GPa in the as annealed state to 6.4 GPa after HPT. Deformed samples were then annealed in the range 200 – 600oC and peak hardness of 7.8 GPa was observed after annealing at 400oC for 1 hour. Differential scanning calorimetry (DSC) and electrical resistivity tests showed that the deformed alloy undergoes a two stage phase transformation on heating from room temperature up to 700oC. The first stage of transformation was associated with hardening behavior while the second one which is reverse α' → γ transformation resulted in a reduction in hardness. Annealing at 400oC after deformation was found to increase the magnetization saturation (Msat) values.

  Info
Periodical
Materials Science Forum (Volumes 667-669)
Edited by
Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon
Pages
589-592
DOI
10.4028/www.scientific.net/MSF.667-669.589
Citation
I. Shuro, M. Umemoto, Y. Todaka, H. H. Kuo, H. C. Wang, "Anomalous Property Evolution during Annealing in HPTed SUS 304 Austenitic Stainless Steel", Materials Science Forum, Vols. 667-669, pp. 589-592, 2011
Online since
December 2010
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