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Effect of Prior Austenite Grain Size on Hole Expansion Ratio of Quenching and Partitioning Processed Medium-Mn Steel

Title
Effect of Prior Austenite Grain Size on Hole Expansion Ratio of Quenching and Partitioning Processed Medium-Mn Steel
Authors
Kim, J.H.Lee, S.W.Lee, K.Kim, J.-K.Suh, D.-W.
Date Issued
Apr-2019
Publisher
SPRINGER
Abstract
The effect of the prior austenite grain size (PAGS) on the tensile properties and hole expansion ratio (HER) has been investigated. Starting from different PAGS values (4.7 m and 15.2 m) obtained by controlling the austenitizing temperature, microstructure consisting of martensite and austenite (V of 0.09-0.18) was produced by the quenching and partitioning process. Increasing V had a beneficial influence on the tensile elongation regardless of the PAGS, but deteriorated the HER. However, larger PGAS alleviated the degradation of the HER. The major influence of a larger PAGS on the HER results from the decreased population of interface between neighboring martensite in the shear-affected zone, because that interface is revealed to be a major site for void formation during hole expansion testing.
URI
http://oasis.postech.ac.kr/handle/2014.oak/100082
ISSN
1047-4838
Article Type
Article
Citation
JOM, vol. 71, no. 4, page. 1366 - 1374, 2019-04
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 SUH, DONG WOO
Graduate Institute of Ferrous Technology
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