<正> 本文通过金相显微镜和透射电子显微镜的观察和电子衍射分析,研究了控制轧制的低碳Mn-Mo-Nb铁素体钢和加入稀土之后的组织结构,探讨稀土的作用. 试验钢是在50kg非真空高频感应炉中熔炼的,铸成50kg圆锭,其化
A study was made of the effect of rare earth (RE) addition on the microstructure and fractograph of the controlled rolling low carbon MnMoNb ferrite steel. Further refinement of grains as well as the decrement and refinement of bainite and martensite, hence, a mixed structure of equiaxial and acicular ferrite in the steel may be achieved by RE addition. The ultrairdcrostructural RE inclusion, which is able to contribute RE-containing steel for refinement of grains in the process of controlled rolling, is observed on the fracture surface. Therefore, a satisfactory combination of mechanical properties, such as improved strength and impact toughness, may be approached for the steel containing RE addi(?)ion.
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