The effect of microstructure on absorbed energy at high strain rate has been investigated to develop 590 MPa TS grade hot-rolled dual-phase sheet steels with excellent crashworthiness and formability. Increase of ferrite-martensite perimeter led to higher absorbed energy of up to 30% strain and higher n-value at 10% strain during 2000/s strain rate deformation. This is attributed to the dispersion of fine martensite, which enhances internal stress during high strain rate deformation. On the basis of the above described result, a hot rolled dual phase steel of from 1.4 to 2.0 mm in thickness with low yield ratio, high elongation, excellent crashworthiness and formability can be developed with a new precisely cooling process after finishing rolling.
TS590 MPa grade hot rolled thin gauge sheet steels with excellent crashworthiness and formability
Dünnes Warmband der Festigkeitsklase 590 MPa mit ausgezeichneter Umformbarkeit und Crashverhalten
Titel japanisch
Kawasaki Steel Giho ; 31 , 3 ; 176-180
1999
5 Seiten, 10 Bilder, 3 Tabellen, 8 Quellen
Aufsatz (Zeitschrift)
Japanisch
High Strength Hot-rolled Sheet Steel with Excellent Crashworthiness Induced by Strain Age Hardening
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