Evolution of transformation plasticity during bainitic transformation

verfasst von: Hans Gerd Lambers, Sergej Tschumak, Hans Jürgen Maier, Demircan Canadinc
Abstract: The influences of prior austenitization treatment and the state of applied stresses on the evolution of transformation plasticity strains during isothermal bainitic phase transformation and the resulting microstructures were examined. The key finding is that, upon pre-straining, the amount of transformation plasticity strain under superimposed elastic stresses is dictated by both the prior austenite grain size and the (0.01% offset) yield strength of the supercooled austenite. Furthermore, the superimposition of internal stresses present due to pre-straining and externally applied stresses results in transformation plasticity strains similar to those obtained when a permanent stress equivalent to the 0.01 % offset yield strength of the supercooled austenite is applied. Another important result is that lower transformation plasticity strains were observed when decreasing the austenite grain size, which is accompanied by an increase in grain boundary area per volume, hindering the growth of preferred variants. Overall, the results clearly lay out the influence of austenite grain size and the particular 0.01 % offset yield strength of the supercooled austenite in limiting the transformation plasticity strains, which has to be incorporated into current models involving bainitic phase transformations.
Externe Organisation(en): Universität Paderborn
Koc University
Typ: Artikel
Journal: International Journal of Materials Research
Band: 102
Seiten: 1152-1163
Anzahl der Seiten: 12
ISSN: 1862-5282
Publikationsdatum: 2011
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Physik der kondensierten Materie, Physikalische und Theoretische Chemie, Metalle und Legierungen, Werkstoffchemie
Elektronische Version(en): https://doi.org/10.3139/146.110558 (Zugang: Unbekannt)

BibTeX

@article{a913effb597343758103ab0332fa2630,
title = "Evolution of transformation plasticity during bainitic transformation",
abstract = "The influences of prior austenitization treatment and the state of applied stresses on the evolution of transformation plasticity strains during isothermal bainitic phase transformation and the resulting microstructures were examined. The key finding is that, upon pre-straining, the amount of transformation plasticity strain under superimposed elastic stresses is dictated by both the prior austenite grain size and the (0.01% offset) yield strength of the supercooled austenite. Furthermore, the superimposition of internal stresses present due to pre-straining and externally applied stresses results in transformation plasticity strains similar to those obtained when a permanent stress equivalent to the 0.01 % offset yield strength of the supercooled austenite is applied. Another important result is that lower transformation plasticity strains were observed when decreasing the austenite grain size, which is accompanied by an increase in grain boundary area per volume, hindering the growth of preferred variants. Overall, the results clearly lay out the influence of austenite grain size and the particular 0.01 % offset yield strength of the supercooled austenite in limiting the transformation plasticity strains, which has to be incorporated into current models involving bainitic phase transformations.",
keywords = "Bainite, Phase transformation, Pre-deformation, Supercooled austenite, Superimposed stress",
author = "Lambers, {Hans Gerd} and Sergej Tschumak and Maier, {Hans J{\"u}rgen} and Demircan Canadinc",
year = "2011",
doi = "10.3139/146.110558",
language = "English",
volume = "102",
pages = "1152--1163",
journal = "International Journal of Materials Research",
issn = "1862-5282",
publisher = "Walter de Gruyter GmbH",
number = "9",
}