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本文用激光束和电子束对M2钢及52100钢进行自淬火表面处理。透射电镜的观察表明,表面熔凝区中马氏体的亚结构为{112}孪晶。还利用选区电子衍射技术测定了马氏体的正方度。在某些简化假设下,求得了一维传热方程的解析解。从这个解算出的冷速在较高冷速范围内与从显微组织估计的冷速相符。用Hall—Petch方程,对经过自淬火的高碳低合金钢的显微硬度作了分析。
In this paper, M2 steel and 52100 steel were self-quenched by laser beam and electron beam. Transmission electron microscopy showed that the substructure of martensite in the surface melting zone was {112} twins. The squareness of martensite has also been determined using the selected area electron diffraction technique. Under some simplifications, an analytical solution of the one-dimensional heat transfer equation is obtained. The cooling rate calculated from this solution corresponds to the cooling rate estimated from the microstructure at a higher cooling rate range. The Hall-Petch equation was used to analyze the microhardness of self-quenched high-carbon low-alloy steel.