低碳钢中铁素体动态再结晶的粒子激发形核  

Particle stimulated nucleation of dynamic recrystallization of ferrite in a low carbon steel

作　　者：王猛[1] 李龙飞[1] 杨王玥[2] 孙祖庆[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2008年第9期993-996,1028,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.50701004)

摘　　要：利用淬、回火工艺得到具有弥散分布的渗碳体粒子＋铁素体双相组织的低碳钢,采用Gleeble-1500型模拟机进行热压缩变形实验,研究了在700℃、0.01 s^-1条件下变形过程中渗碳体粒子对低碳钢铁素体动态再结晶过程的影响.结果表明：在700℃、0.01 s^-1条件下变形时,存在以粒子激发形核机制为主的铁素体动态再结晶过程,在形变初期粒子激发形核主要在大尺寸渗碳体粒子（〉1μm）附近发生,大应变量下应变累积促进粒子激发形核在小尺寸渗碳体粒子（0.5-1μm）附近发生.The microstructure consisting of dispersed cementite particles and ferrite grains was obtained by quenching and tempering in low carbon steel. The effect of cementite particles on the dynamic recrystallization of ferrite in this low carbon steel was investigated by hot compression tests at 700 ℃ and 0.01 s^-1 on a Gleeble 1500 test machine. The results indicated that during hot deformation at 700 ℃ and 0.01 s^-1, the dynamic recrystallization of ferrite takes place mainly by particle stimulated nucleation. At the beginning stage, particle stimulated nucleation occurs firstly near coarser particles （larger than 1 μm）. At larger strain, particle stimulated nucleation also occurs near relatively small particles （between 0.5 and 1μm） due to accumulative strain.

关 键 词：低碳钢 铁素体 动态再结晶 粒子激发形核 电子背散射衍射 

分 类 号：TG111.7[金属学及工艺—物理冶金] TG142.31[金属学及工艺—金属学]