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- W4386130218 abstract "Fracture at sheared edges upon stretch flanging is a severe problem for ultrahigh-strength steel (UHSS). This study was focused on the improvement of stretch flangeability by heat treatment of the sheared edge of UHSS samples. The materials studied were dual-phase steel and full martensite steel. The steel samples were pierced with 10 mmΦ holes and then heat-treated by whole-area or partial-area heating. The heated materials were tested by the hole expansion test to determine the hole expansion ratio (λ). The mechanical properties and microstructural transformation depending on the heat-treatment temperature were also investigated. The experimental results of whole-area heating showed that λ of the steels improved with heat-treatment temperature up to Ac1 (the temperature at which ferrite starts to transform to austenite). The λ significantly decreased with heat treatment between Ac1 and Ac3 (the temperature at which ferrite has transformed completely to austenite). The λ increased again with heat treatment over Ac3. The λ dependence on the heat-treatment temperature was explained by the recovery of work hardening and microstructural transformation. The experimental results of partial-area heating showed that short-time and partial-area heat treatment was sufficient to improve λ." @default.
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- W4386130218 date "2023-09-01" @default.
- W4386130218 modified "2023-09-26" @default.
- W4386130218 title "Effect of Microstructural Transformation upon Edge Heat Treatment on Stretch Flangeability of Ultrahigh-Strength Steel with Sheared Edge" @default.
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- W4386130218 doi "https://doi.org/10.2320/matertrans.mt-p2023001" @default.
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