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采用OM,SEM,EDS,TEM,EBSD,XRD等分析手段,研究了稀土和热处理对M42高速钢组织和性能的影响规律.结果表明,M2C是M42高速钢主要的共晶碳化物类型.稀土处理后,M2C共晶碳化物形貌由规则层片状变为不规则环状.尽管二者形貌差异明显,但具有相同的微观结构和晶体取向特征.与层片状碳化物相比,环状M2C共晶碳化物热稳定性较差,高温加热时更易发生分解和球化,使碳化物尺寸明显细化.小尺寸碳化物在淬火加热时易于溶解,提高了淬火后基体中合金元素的固溶度,使M42高速钢硬度增加了1.5 HRC.
The effects of rare earth and heat treatment on the microstructure and properties of M42 high speed steel were studied by OM, SEM, EDS, TEM, EBSD and XRD.The results showed that M2C was the main eutectic carbide of M42 high speed steel.Rare earth treatment , The morphology of M2C eutectic carbide changed from regular lamellae to irregular lamella.Although the morphology of M2C was obviously different, it had the same microstructure and crystal orientation characteristics.Compared with lamellar carbides, The M2C eutectic carbides have poor thermal stability and are more susceptible to decomposition and spheroidization when heated at high temperatures, resulting in a marked refinement of the carbides. Small carbides are easily dissolved during quenching and heating, resulting in an increase of alloying elements in the matrix after quenching Solubility, M42 high-speed steel hardness increased by 1.5 HRC.