Effect of Prior Austenite Grain Size on Hole Expansion Ratio of Quenching and Partitioning Processed Medium-Mn Steel
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- 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
- 2019-04
- 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
- https://oasis.postech.ac.kr/handle/2014.oak/100082
- DOI
- 10.1007/s11837-019-03332-y
- ISSN
- 1047-4838
- Article Type
- Article
- Citation
- JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY, vol. 71, no. 4, page. 1366 - 1374, 2019-04
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