Aim of the present paper is to discuss key factors for improvement in panel dent-resistance when the bake-hardenable steel is used. In this work this problem is dicussed through metallurgical view. Mechanism of dent resistance by using bake-hardenable steels is discussed through metallurgical examination in strain age-hardening. To show a sharp yield point or straight elastic modulus in baked panel is a key of dent-resistance. This is caused by a simple locking of dislocations after stamping with dissolved carbon. This process proceeds just after stamping and by baking below 120 deg C. The bake-hardenability measured by uniaxial tensile test is an index of dissolved dissolved carbon, but the 0.2% offset yield strength of panel is not an index of dent-resistance.
Bake-hardenable sheet steels for improving dent-resistance of auto body panels
Advances in Automotive and Transportation Technology and Practice for the 21st Century, ISATA, ISATA, 32 ; Materials for energy-efficient vehicles ; 217-224
1999
8 Seiten, 14 Bilder, 1 Tabelle, 4 Quellen
Conference paper
English
Bake-hardenable sheet steels for improving dent-resistance of auto body panels
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