In order to produce a super formable steel sheet, the effects of chemical compositions and process criteria on the precipitation of Ti compounds in hot rolled bands and the formability including r value and elongation were investigated. As a result, r value and (222) texture of annealed sheets are affected by the distribution and type of precipitates in the hot bands. Precipitation behavior during hot rolling is dependent on the chemical compositions among which Ti promotes the precipitation of TiS+Ti(C,N). The Ti addition above 0.070 wt.%, especially, is very effective to precipitate these particles, resulting in decreasing recrystallization temperature and developing (222) orientation in the annealed sheets. As well as, low coiling temperature was also found to improve the r value and (222) texture. Consequently from the above works, a super formable steel sheet with the r value above 2.5 and elongation above 50 % was developed and available for the car application.
Development of super formale steel sheet for automotives
Entwicklung von superformbarem Stahlblech für Kraftfahrzeuge
1997
9 Seiten, 7 Bilder, 3 Tabellen, 4 Quellen
Conference paper
English
Kraftfahrzeug , Stahlblech , Formbarkeit , Titan , chemische Verbindung , Band (Metall) , Warmwalzen , Strecken , Glühen , Ablagerung , Rekristallisation , Orientierung , Textur
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