Abstract: The  single  pass  thermal  compression  test  of 0.019C  and  0.052C  two  kinds  of ultra-low  carbon  bainite  (ULCB)steel  with  deformation  5%~50%,strain  rate 2s^-1 at   1100  ℃  has  been  carried  out  by  Thermechmastor-Z  thermal simulation machine.Results showed that as deformation was lower than 40% the deformation-recrystallization behavior  of two kinds of ULCB steel was same that was to form crystal nucleus of recrystallization with 10% deformation,partially recrystallize  with  20%  deformation,and  basically  perform  recrystallization  with  40%  deformation.  With  deformation  more than 40%,the grain  size of 0.052C ULCB  steel was more fine and uniform than that of 0.019C ULCB  steel.

Key words: Ultra-Low Carbon Bainite Steel,Thermal Simulation,Stress-Strain,Dynamic Recrystallization

摘要： 采用Thermechmastor-Z热模拟试验机对0.019%C和0.052%C的两种超低碳贝氏体(ULCB)钢进行单道次热压缩试验,变形温度为1100℃,应变速率为2s^-1,变形量为5%～50%。结果表明,当变形量低于40%时。两种ULCB钢的形变再结晶规律相同:经10%变形后产生再结晶晶核,20%变形后发生部分再结晶,变形40%后基本完成再结晶。当变形量超过40%后,0.052%C ULCB钢中晶粒比0.019%C ULCB钢细小均匀。

关键词: 超低碳贝氏体钢, 热模拟, 应力-应变, 动态再结晶