摘要
借助热模拟压缩变形实验以及SEM,TEM,EBSD技术,研究了基体为铁素体、第二组织形态分别为片层状珠光体及颗粒状渗碳体的低碳钢在600—700℃,形变速率为10^(-3)—10s^(-1)范围内铁素体相区的热变形特征及铁素体动态再结晶组织演变规律,并对机理进行了初步探讨,结果表明:第二组织形态分别为片层状珠光体和弥散分布的颗粒状渗碳体的低碳钢均可发生铁素体动态再结晶;与颗粒状渗碳体相比,珠光体存在时动态再结晶开始发生和进入稳态所需的形变量都较高,再结晶进入稳态阶段后铁素体平均晶粒截径较大,说明微米级颗粒状渗碳体促使铁素体动态再结晶形核及发展的能力,其钉扎铁素体再结晶晶粒晶界,抑制长大作用明显。
The microstructure evolution during dynamic recrystallization and the deformation characteristics of a low carbon steel within the temperature range of 600-700 degreesC and a strain rate range of 10(-3) to 10 s(-1) have been investigated by means of thermal-compression simulation test, SEM, TEM and EBSD. In order to understand the effect of microstructure on dynamic recrystallization behaviour, two different microstructures were adopted, which consist of ferrite plus pearlite and ferrite plus fine cementite particles respectively. The results show that dynamic recrystallization takes place in these two cases. However, in the microstructure with pearlite higher strain is needed to start recrystallization and reach the steady state, comparing with the microstructure with fine cementite particles. The measurement confirms that ferrite with smaller grain size in steady state can be obtained in microstructure with ferrite and cementite, which indicates a more significant effect of separately distributed fine cementite particles on promoting recrystallization nucleation and hindering the grain growth than that of pearlite.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第7期691-698,共8页
Acta Metallurgica Sinica
基金
国家自然科学基金50171004
国家科技部973项目G19998061506资助
关键词
珠光体
微米级颗粒状渗碳体
低碳钢
铁索体动态再结晶
第二组织
pearlite
cementite particle of micron order
low carbon steel
dynamic recrystallization of ferrite
minor microstructure
