材料期刊网

After 2% pre-deformation, the baking treatment with different schedule was carried out in low silicon TRIP steel sheet with niobium. The effects of baking temperature and time on microstructures and mechanical properties were investigated. The results show that, with increasing of baking temperature and time, the volume fraction of retained austenite decreases, and tempered martensite increases; As baking temperature ranging from 80 to 170℃, the bake-hardening(BH) value increases obviously, while from 170℃ to 230℃, the variation of BH value is very slight; As baking time ranging from 2 to 20 min, the BH value increases significantly, while the BH value decreases when it exceeds 20 min. So that when the baking temperature is 170℃ and the baking time is 20 min, the low silicon TRIP steel sheet exhibits good bake-hardening behavior, the highest BH value being above 70MPa.