Paper Title:
Strain Hardening Behaviour of PM Alloys with Heterogeneous Microstructure
  Abstract

Tensile stress-strain and dynamic acoustic resonance tests were performed on Fe-C-Ni- Cu-Mo high-strength steels, characterized by a heterogeneous matrix microstructure and the prevalence of open porosity. All materials display the first yielding phenomenon and, successively, a continuous yielding behavior. This flow behavior can be described by the Ludwigson equation and developes through three stages: the onset of localized plastic deformation at the pore edges; the evolution of plastic deformation at the pore necks (where the austenitic Ni-rich phase is predominant); the spreading of plastic deformation in the interior of the matrix. The analytical modeling of the strain hardening behavior made it possible to obtain the boundaries between the different deformation stages.

  Info
Periodical
Materials Science Forum (Volumes 534-536)
Edited by
Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim
Pages
741-744
DOI
10.4028/www.scientific.net/MSF.534-536.741
Citation
G. Straffelini, "Strain Hardening Behaviour of PM Alloys with Heterogeneous Microstructure", Materials Science Forum, Vols. 534-536, pp. 741-744, 2007
Online since
January 2007
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Price
$32.00
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