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首页> 外文期刊>Journal of Korean Institute of Metal and Materials >Effects of Carbon on the Carbide Microstructure and Mechanical Properties of Spray-Formed High Speed Steels
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Effects of Carbon on the Carbide Microstructure and Mechanical Properties of Spray-Formed High Speed Steels

机译：碳对喷射成形高速钢碳化物组织和力学性能的影响

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摘要

Effect of carbon on the carbide microstructure of spray-formed high speed steels, Fe-xC-4.3Cr-6.5Mo-5.5W-5V-8.5Co, was investigated by calculating the phase equilibria via Thermo-Calc program and by analyzing their carbide microstructure via transmission electron microscopy in particular. The calculation showed that the volume fraction of fine secondary carbides increases with carbon concentration and that fine secondary MC carbides become more prominent over M_6C carbides at larger carbon concentration. The result further showed that the driving force for the secondary MC carbides is distinctively larger than that for the secondary M_6C carbides. These results were in good agreement with the microstructural analysis using particularly TEM showing that the fine secondary carbides are mostly the MC carbides and that their volume fraction increases with carbon concentration. Tempering treatment results in a large increase of the hardness and bend strength of these steels. This is primarily because of the precipitation of fine secondary MC carbides during tempering treatment. This tempering effect was more pronounced at larger carbon content because of the larger amount of precipitation of fine secondary MC carbides. The bend deflection in as-rolled condition decreased with increasing carbon content. This appeared to e closely related to the variation of the amount of coarse primary carbides with carbon content.
机译：通过使用Thermo-Calc程序计算相平衡并分析其碳化物，研究了碳对喷射成形高速钢Fe-xC-4.3Cr-6.5Mo-5.5W-5V-8.5Co的碳化物显微组织的影响。尤其是通过透射电子显微镜观察的显微组织。计算表明，细次级碳化物的体积分数随碳浓度的增加而增加，并且在较高碳浓度下，精细次级碳化物比M_6C碳化物更为突出。结果进一步表明，次级MC碳化物的驱动力明显大于次级M_6C碳化物的驱动力。这些结果与使用特别是TEM的显微组织分析非常吻合，显示出细小的次生碳化物主要是MC碳化物，并且它们的体积分数随碳浓度的增加而增加。回火处理导致这些钢的硬度和弯曲强度大大提高。这主要是由于在回火处理过程中细小的二次MC碳化物的沉淀。由于较高的次生MC碳化物析出量较大，因此在较高的碳含量下，这种回火效果更加明显。轧制条件下的弯曲挠度随碳含量的增加而降低。这似乎与粗初级碳化物数量随碳含量的变化密切相关。

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