夹杂物诱导晶内铁素体形核物理模拟研究

The Physical Simulation of Inclusions-Induce Formation Nucleation of Intragranular Ferrite

用物理模拟法研究了夹杂物MnS、Al2O3和Al2O3·Mns在晶内铁素体形核过程中的作用;用数字式金相显微镜观察了夹杂物界面附近区域的金相显微组织变化;用电子探针分析仪对夹杂物界面附近微区的化学成分进行了分析.研究结果表明:MnS、Al2O3和Al2O3·MnS不能使夹杂物与金属界面附近微区的化学成分发生变化,但MnS与Al2O3·MnS具有诱导晶内铁素体形核的能力,Al2O3不具有诱导晶内铁素体形核的能力;在氧、硫复合物Al2O3·MnS中,夹杂物表面的物质Mns在晶内铁素体形核过程中起着重要作用.

The roles of inclusions MnS, Al2O3 and Al2O3·MnS in the formation nucleation of intragranular ferrite were studied by means of the plysical simulation method. The microstructures of the micro-zone adjacent to the inclusions were observed with metallurgical microscope and the chemical compositions of the micro-zone adjacent to the inclusions were analyzed with an electron probe mircoanalyzer. The results show that inclusions MnS, Al2O3 and Al2O3·MnS can not change the chemical composition of the metai micro-zone adjacent to the inclusions. The MnS and Al2O3·MnS have an ability to induce the nucleation of intragranular ferrite, but the Al2O3 has no potential for nucleating intragranular ferrite during the thermal cycle. The MnS in compound inclusions Al2O3·MnS plays an important role in the formation nucleation of intragranular ferrite.