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利用电子显微分析及X射线衍射分析等手段,揭示了不同温度回火给高速钢带来的组织变化,并从组织方面分析了高速钢材料的强韧性随回火温度的变化规律。研究发现,低温回火组织的高塑性决定了组织的低硬度和高抗弯强度及冲击韧性。而高温回火时特殊碳化物的析出等过程降低了回火组织的塑性,因而回火组织有很低的冲击韧性和很高的硬度及抗弯强度。同时分析认为,固溶强化是一个不容忽视的二次硬化过程中的强化过程。另外碳化物析出可能是残余奥氏体催化的重要原因。
The microstructure changes of high speed steel brought by tempering at different temperatures were revealed by means of electron microscopic analysis and X-ray diffraction analysis. The changes of toughness of high-speed steel with tempering temperature were analyzed from the aspects of microstructure. The study found that low temperature tempering tissue determines the high plasticity of the low hardness and high bending strength and impact toughness. The tempering of high temperature tempering and other special carbide precipitation process reduces the plasticity of tempering, tempering the organization has a very low impact toughness and high hardness and flexural strength. At the same time, it is considered that solid solution strengthening is a strengthening process in the secondary hardening process which can not be ignored. In addition carbide precipitation may be an important reason for the residual austenite catalysis.