中文摘要：

采用微恒蠕变速率的方法测量了过饱和热变形取向电工钢在不同恒温条件下（750-1000℃）的真应力-时间曲线,以确定MnS粒子析出的起讫时间以及铁素体基体再结晶的开始时间。观察了MnS析出粒子的形貌和密度,分析了析出与再结晶过程的相互影响。观察与分析表明,铁素体再结晶的孕育期随温度降低单调延长,950℃以上时再结晶先于析出发生,并因此可能迟滞析出行为。在900℃以下MnS粒子析出先于再结晶发生,析出后会迟滞后续再结晶行为。随温度降低Mn、S原子扩散速度减慢而析出驱动力增强,造成MnS粒子析出随温度变化呈＂C＂形,且在850~900℃范围内析出的孕育时间最短。定量计算表明,只有借助Mn、S原子沿晶界、位错扩散才能在本文试验条件下造成MnS粒子析出。

英文摘要：

True stress-time curves of the hot deformed and supersaturated grain-oriented electrical steel under different constant temperatures（750-1000 ℃） were measured based on an invariable tiny creep technique,in order to determine the starting and ending time points of MnS precipitation as well as the recrystallization incubation period of ferrite matrix.The precipitation morphology of MnS particles and the corresponding particle density were observed.The mutual effects between the precipitation and recrystallization were analyzed.It is indicated that the recrystallization incubation period increases monotonously with decreasing temperature,while the recrystallization of ferrite appears before MnS precipitation above 950 ℃,which might delay the precipitation behaviors.The MnS precipitation appears before recrystallization of ferrite below 900 ℃,which might delay the following recrystallization process.The diffusion velocity of Mn and S atoms decreases and the precipitation driving force increases with decreasing temperature,which leads to the ＂C＂ form of MnS precipitation at the temperature range,while the incubation time becomes the shortest at 850-900 ℃.It is indicated that according to a quantitative calculation,the MnS particles could only nucleate if the Mn and S atoms diffuse through the rapid channel of grain boundaries and dislocations under the experimental conditions.