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The effect of cooling rate on the damage micromechanisms of DP steels

Orlando León Garcia UGent, Roumen Petrov UGent and Leo Kestens UGent (2010) Materials Science Forum. In Materials Science Forum 638-642. p.3337-3342
abstract
The microstructural failure mechanisms of two DP steel sheets cooled with different cooling rates during their heat treatment are compared in the present study. The as-cold rolled DP steel sheets were annealed at intercritical temperature and cooled down with rates of 45 degrees C/s (quenching) and 2 degrees C/s (slow cooling). Uniaxial tensile tests were carried out on samples from both sheets and the microstructure of undeformed samples and the broken tensile specimens was evaluated by optical microscopy, scanning electron microscopy and electron back-scatter diffraction technique. Although the grain size did not show significant differences, the amount and size of the constituents, e.g. martensite and bainite, differ between both alloys. Concerning the mechanical properties, the quenched material showed superior strength and ductility besides a less localized deformation at higher strains. The area fraction of voids in the broken specimens was low for both steels. In the slow cooled samples the nucleation of shear bands was on the large voids and cracks were observed along these shears bands. It was concluded that the detrimental effect of void nucleation on both steels is not only attributed to their null-carry capacity but more to the stress concentration close to the voids which gives rise to strain localization in the form of shear bands.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
DP steel, TENSILE PROPERTIES, shear bands, EBSD, void initiation, FRACTURE, IF STEEL, FERRITE, DUAL-PHASE STEELS
in
Materials Science Forum
Mater. Sci. Forum
editor
T Chandra, N Wanderka, W Reimers and M Ionescu
series title
Materials Science Forum
volume
638-642
issue title
THERMEC 2009, pts 1-4
pages
3337 - 3342
publisher
Trans Tech
place of publication
Stafa-Zürich, Switzerland
conference name
6th International conference on Processing and Manufacturing of Advanced Materials
conference location
Berlin, Germany
conference start
2009-08-25
conference end
2009-08-29
Web of Science type
Proceedings Paper
Web of Science id
000281043801218
ISSN
0255-5476
DOI
10.4028/www.scientific.net/MSF.638-642.3337
language
English
UGent publication?
yes
classification
P1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1904329
handle
http://hdl.handle.net/1854/LU-1904329
date created
2011-09-20 11:14:59
date last changed
2012-08-06 14:42:36
@inproceedings{1904329,
  abstract     = {The microstructural failure mechanisms of two DP steel sheets cooled with different cooling rates during their heat treatment are compared in the present study. The as-cold rolled DP steel sheets were annealed at intercritical temperature and cooled down with rates of 45 degrees C/s (quenching) and 2 degrees C/s (slow cooling). Uniaxial tensile tests were carried out on samples from both sheets and the microstructure of undeformed samples and the broken tensile specimens was evaluated by optical microscopy, scanning electron microscopy and electron back-scatter diffraction technique. Although the grain size did not show significant differences, the amount and size of the constituents, e.g. martensite and bainite, differ between both alloys. Concerning the mechanical properties, the quenched material showed superior strength and ductility besides a less localized deformation at higher strains. The area fraction of voids in the broken specimens was low for both steels. In the slow cooled samples the nucleation of shear bands was on the large voids and cracks were observed along these shears bands. It was concluded that the detrimental effect of void nucleation on both steels is not only attributed to their null-carry capacity but more to the stress concentration close to the voids which gives rise to strain localization in the form of shear bands.},
  author       = {Le{\'o}n Garcia, Orlando and Petrov, Roumen and Kestens, Leo},
  booktitle    = {Materials Science Forum},
  editor       = {Chandra, T and Wanderka, N and Reimers, W and Ionescu, M},
  issn         = {0255-5476},
  keyword      = {DP steel,TENSILE PROPERTIES,shear bands,EBSD,void initiation,FRACTURE,IF STEEL,FERRITE,DUAL-PHASE STEELS},
  language     = {eng},
  location     = {Berlin, Germany},
  pages        = {3337--3342},
  publisher    = {Trans Tech},
  title        = {The effect of cooling rate on the damage micromechanisms of DP steels},
  url          = {http://dx.doi.org/10.4028/www.scientific.net/MSF.638-642.3337},
  volume       = {638-642},
  year         = {2010},
}

Chicago
León Garcia, Orlando, Roumen Petrov, and Leo Kestens. 2010. “The Effect of Cooling Rate on the Damage Micromechanisms of DP Steels.” In Materials Science Forum, ed. T Chandra, N Wanderka, W Reimers, and M Ionescu, 638-642:3337–3342. Stafa-Zürich, Switzerland: Trans Tech.
APA
León Garcia, O., Petrov, R., & Kestens, L. (2010). The effect of cooling rate on the damage micromechanisms of DP steels. In T. Chandra, N. Wanderka, W. Reimers, & M. Ionescu (Eds.), Materials Science Forum (Vol. 638–642, pp. 3337–3342). Presented at the 6th International conference on Processing and Manufacturing of Advanced Materials, Stafa-Zürich, Switzerland: Trans Tech.
Vancouver
1.
León Garcia O, Petrov R, Kestens L. The effect of cooling rate on the damage micromechanisms of DP steels. In: Chandra T, Wanderka N, Reimers W, Ionescu M, editors. Materials Science Forum. Stafa-Zürich, Switzerland: Trans Tech; 2010. p. 3337–42.
MLA
León Garcia, Orlando, Roumen Petrov, and Leo Kestens. “The Effect of Cooling Rate on the Damage Micromechanisms of DP Steels.” Materials Science Forum. Ed. T Chandra et al. Vol. 638–642. Stafa-Zürich, Switzerland: Trans Tech, 2010. 3337–3342. Print.