摘要
用MMS-300热力模拟实验机测定了细晶高强IF钢汽车板在变形温度为950℃时的静态和动态CCT曲线,通过实验可以发现,变形条件和冷却速度对相变点的影响很大,变形加速了铁素体相变;随冷却速度的提高,铁素体转变区域增大。从透射电镜照片分析可知,随冷却速度的增加,铁素体晶粒内部位错密度增高,晶粒内部有Nb(C、N)、NbC析出。
The static and dynamic state CCT curves of fine-grain and high-strength IF steel at deformation temperature 950℃ were tested by MMS-300 thermal mechanical simulator. The results show that the deformation condition and cooling rate have great effects on transformation point. The deformation can accelerate the ferrite transformation, and the transition region of ferrite enlarges with the increase of cooling rate. The TEM analysis shows that dislocation density in ferrite grain increases with the increase of cooling rate, Nb（C ,N） and NbC are precipitated in the grain.
出处
《热加工工艺》
CSCD
北大核心
2008年第16期50-52,共3页
Hot Working Technology
关键词
细晶高强汽车板
热模拟
冷却速度
相变
fine-grain and high-strength IF steel
thermal simulation
cooling rate
transformation
