论文部分内容阅读
研究发现，在低碳钢强变形冷敷试样中存在分割晶粒的基块（Ｍａｔｒｉｘｇｒａｉｎ），用ＳＥＭ、ＷＤＳ以及ＴＥＭ分析探明了基块边缘的基带（Ｍａｔｒｉｘｂａｎｄ）是由低碳无畸变的铁素体亚晶组成。再借助金相照片说明在随后的等温再结晶过程中，这种铁素体亚晶所组成的基带吞食其内部基块畸变区长大形成稳定的再结晶晶核。实验指出，低碳钢存在碳引起的再结晶晶粒长大的突破温度（Ｔ＿Ｂ），其上、下的激活能差值等于碳在α－Ｆｅ中扩散激活能，且Ｔ＿Ｂ以上的再结晶激活能小于α－Ｆｅ晶界扩散激活能，有力地支持了既存再结晶形核理论。
The results showed that there was a segmented graingrain in the cold deformed mild steel samples. The SEM, WDS and TEM analyzes showed that the matrixband at the edge of the basement was composed of low-carbon undistorted iron Element sub-crystal composition. And then with the help of metallographic photographs shows that in the subsequent isothermal recrystallization process, the ferrite sub-crystal composed of the base band swallowed its internal block distortion zone grew up to form a stable recrystallized nuclei. The experimental results show that there is a breakthrough temperature (T_B) of recrystallization grain growth caused by carbon in low carbon steels, and the difference between the activation energies above and below is equal to the diffusion activation energy of carbon in α-Fe, and the recrystallization activation above T_B Can be less than the α-Fe grain boundary diffusion activation energy, effectively supporting the existing recrystallization nucleation theory.