CML [CML] Prof. Dong-Woo Suh: Effect of Prior Austenite Grain Size on Hole Expansion Ratio
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댓글 0건 조회 492회 작성일 2019-01-28 14:27
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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 lm and 15.2 lm) obtained by controlling the austenitizing temperature, microstructure consisting of martensite and austenite (Vc of 0.09–0.18) was produced by the quenching and partitioning process. Increasing Vc 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.
- 이전글[CML] Prof. Dong-Woo Suh: Influence of initial microstructures on intercritical 19.01.28
- 다음글[CTL] Fazlollah Sadeghi: Optimizing Grain Selection Design in the Single-Crystal 18.12.31
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