Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 729, Issue -, Pages 276-284Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.05.083
Keywords
Hole expansion ratio; Quenching and partitioning; Medium Mn steel; Stretch flangeability; Retained austenite; Strain-induced martensite
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Funding
- POSCO Technical Research Laboratories (South Korea)
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The stretch flangeability of a medium Mn steel prepared by quenching and partitioning was examined using a hole-expansion test. Samples were heat-treated at quenching temperatures 90 degrees C <= T-Q 5 <= 170 degrees C, at which no secondary martensite is formed upon final quenching. The hole-expansion test used a 60 conical punch. The hole at the center of the specimens was prepared by punching or wire cutting. In both sample preparation conditions, hole expansion ratio (HER) increased as T-Q decreased. The dependence of HER on T-Q was more pronounced in the samples prepared by punching than in samples prepared by wire cutting. While there is no clear correlation between HER and tensile properties, the HER decreased as retained austenite increased. By punching, the retained austenite transformed to strain-induced martensite in the shear-affected zone near the hole edge. This martensite has a negative impact on the HER.
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