摘要
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 tested steel was firstly cooled to different temperatures ranging from Ms temperature to Mf temperature using ultra fast cooling system, and then cooled room temperature using furnace cooling. The influence of coiling temperature on microstructure and mechanical properties of DQ＆P steel was investigated. The results show that the volume fraction of ferrite is slightly increased and the volume fraction of retained austenite is increased from 5.9% to 12.1% as the coiling temperature is increased from 200℃ to 360℃. The volume fraction of retained austenite for the coiling temperature of 200℃ remains unchanged after tensile deformation, however, the volume fraction of retained austenite for the coiling temperature of 360℃ is lowered to 8.5% after tensile deformation. The better mechanical properties with the elongation of 23.9%, product of strength and elongation of 20GPa·% and lower yield ratio of 0.79 can be gained at the coiling temperature of 360℃.
出处
《钢铁》
CAS
CSCD
北大核心
2014年第1期70-73,共4页
Iron and Steel
基金
自然科学基金资助项目(51204049)
关键词
DQ&P钢
超快速冷却
卷取温度
残余奥氏体
强塑积
DQ＆P steel
ultra fast cooling
coiling temperature
retained austenite
producl of strength and elonga-lion
