摘要
采用高精度线膨胀仪研究置换型Fe-2.72at%Mn中γ→α的转变行为,对其转变动力学过程为进行了分析。通过在冷却过程中选取不同的淬火温度进行研究表明,选取的淬火温度点越高,奥氏体向铁素体开始转变的温度就越低,完成相变过程所需时间就越短,铁素体生成速率的绝对值也越优先达到最大值;转变后试样室温晶粒组织分析表明,转变过冷度的增大将伴随晶粒明显细化,为相变过程组织控制提供了新思路。
The austenite transformed to ferrite （γ→α） behavior and the kinetic process in substitutional Fe-2.72 at % Mn ahoy were investigated by high-resolution differential dilatometer. Different quenching temperatures were chosen to study the phase transformation behavior during cooling process. The results show that the onset temperature of austenite to ferrite （γ→α） transformation decreases with increasing the quenching temperature and the transformation process finished in a short time, as well as the feiTite formation rate （dfo/dt） has the absolute maximum priority. Additionally, the microstructure observation and analysis show that the grain size decreases with increasing of the degree of undercooling, which provide a new idea for microstructure controlling during phase transformation process.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2009年第1期50-54,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(No.50401003)
全国优秀博士论文作者专项基金(No.200335)
天津市自然科学基金(No.033608811
07JCZDJC01200)
河南省国际合作项目(No.0546620015)资助
关键词
固态相变
线膨胀
过冷度
晶粒直径
solid state phase transformation
linear thermal expansion
undercooling
grain size
作者简介
张哲平（1974-），女，电话：022-25767726；E-mail：2001zhouzheng@163．com。
