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统计观察了热变形Fe-3%Si合金中MnS粒子在900℃的析出行为,并利用过饱和固溶体中第二相粒子析出模型计算了MnS粒子的位错析出与晶界析出的相对关系;观察和计算都表明,MnS析出以位错形核为主.在二次再结晶过程中,晶界上MnS析出粒子的粗化过程决定了晶界的可迁移性;但在晶粒尺寸效应之外,晶界两侧晶粒内位错析出MnS粒子密度的差异对晶界迁移的方向也发挥了决定性作用.观察发现,迁移晶界两侧晶粒内往往显示出不同的MnS粒子密度,而晶界则倾向于向粒子密度较低的一侧迁移.不同取向晶粒内的位错密度等因素会影响到析出粒子的密度,高粒子密度的Goss取向晶粒易于长大.
The precipitation behavior of MnS particles in hot-deformed Fe-3% Si alloy at 900 ℃ was statistically observed. The relative dislocation of MnS particles and grain boundary precipitation were calculated by the second phase particle precipitation model in supersaturated solid solution. The results show that the MnS precipitates are dominated by dislocation nucleation.In the process of secondary recrystallization, the grain boundary MnS precipitated particles roughening the grain boundary mobility; but in the grain size effect , And the difference in density of MnS precipitated out of intragranular dislocations on both sides of the grain boundary also plays a decisive role in the direction of the grain boundary migration.It is found that the grain sizes on both sides of the grain boundary often show different MnS particle densities, The boundary tends to migrate to the lower side of the particle density.The dislocation density in different orientation grains will affect the density of the precipitated particles and Goss oriented grains with high particle density tend to grow.