Effect of Prior Austenite Grain Size on Hole Expansion Ratio of Quenching and Partitioning Processed Medium-Mn Steel
- Authors
- Kim, Ji Hoon; Lee, Sea Woong; Lee, Kyooyoung; Kim, Jin-Kyung; Suh, Dong-Woo
- Issue Date
- Apr-2019
- Publisher
- J O M Institute
- Citation
- JOM, v.71, no.4, pp.1366 - 1374
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOM
- Volume
- 71
- Number
- 4
- Start Page
- 1366
- End Page
- 1374
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/3389
- DOI
- 10.1007/s11837-019-03332-y
- ISSN
- 1047-4838
- 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.
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