晶内铁素体及其组织控制技术研究概况

Review of intragranular ferrite and its microstructure control technologies

介绍了晶内铁素体的组织特点以及晶内铁素体组织对钢材力学性能的影响,得出晶内铁素体能显著提高钢的冲击韧性.详细阐述了晶内铁素体的形核机理,分析表明目前晶内铁素体形核机理仍不够完善,尚未形成统一的机制.同时介绍了钛氧化物、Mn S、稀土氧化物等促进晶内铁素体形核的夹杂物,指出含Ti复合夹杂物是理想的晶内铁素体形核核心.最后分析了夹杂物尺寸、冷却速度对晶内铁素体形核的影响,并简述了一些晶内铁素体组织控制技术,结果表明Ti-B处理、Ti-Mg处理效果优于单独的Ti处理.

The microstructure of intragranular ferrite and the impact of intragranular ferrite on the mechanical property of steel is analyzed to find out that intragranular ferrite can markedly improve the impact toughness of steel. The nucleation mechanisms of intragranular ferrite are expounded particularly to show that the nucleation mechanisms of intragranular ferrite are not perfect enough to develop a uniform nucleation mechanism. The inclusions such as titanic oxides, manganese sulfide and rare earth oxides which can promote the nucleation of intragranular ferrite are introduced to indicate that the compound inclusions with titanium are perfect nucleation core. The impacts of inclusions size and the cooling rate on the nucleation are analyzed. The microstructure control technologies for intragranular ferrite are presented, and the result shows that the addition of titanium and boron and the addition of titanium and magnesium are better than the single addition of titanium.