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试验钢经热轧后,采用超快速冷却系统冷至不同温度(M s~M f之间的某温度)后随炉冷却,研究卷取温度对DQ&P钢组织性能的影响。结果表明,随着卷取温度由200℃升高至360℃,试验钢中铁素体含量略有增加,残余奥氏体体积分数由5.9%增加至12.1%。拉伸变形后,200℃卷取温度下,试验钢的残余奥氏体含量没有变化,而在360℃卷取温度条件下,残余奥氏体体积分数减少为8.5%。卷取温度为360℃时可获得极佳的综合力学性能,伸长率达到23.9%,强塑积达到20GPa·%,且屈强比低至0.79。
After hot rolling, the test steel was cooled to different temperatures (a temperature between M s and M f) by an ultra-rapid cooling system and then cooled in the furnace to study the effect of coiling temperature on the microstructure and properties of DQ & P steel. The results show that as the coiling temperature increases from 200 ℃ to 360 ℃, the ferrite content in the test steel increases slightly, and the retained austenite volume fraction increases from 5.9% to 12.1%. After tensile deformation, the residual austenite content of the test steel did not change at the coiling temperature of 200 ° C, while the retained austenite volume fraction decreased to 8.5% at the coiling temperature of 360 ° C. Coiling temperature of 360 ℃ obtained excellent mechanical properties, elongation of 23.9%, a strong plastic area reached 20GPa ·%, and yield ratio as low as 0.79.