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高速钢工具的耐磨性等性能主要决定于它的硬度和韧性。主要研究了淬火温度和冷速对高速钢韧性的影响。分别在实验室和工业热处理炉中模拟了几种工艺规范,并用静弯曲试验来评估韧性。在同样回火条件下,淬火温度越高,获得的硬度也越高。研究结果显示了低于1200℃淬火的高速钢硬度与韧性之间关系。淬火温度高于1200℃时,韧性显著降低而硬度无明显升高。同时论述了热处理后硬度较低的M2高速钢的力学性能,而某些冷作工具的应用中需要较低热处理硬度。在这种情况下,从较低温度淬火并回火到最高硬度的效果最佳。最后,关于真空炉氮气淬火冷却工艺的研究结果表明,低的淬火压力可以减慢冷速和降低材料韧性,但淬火压力为(6~9)×10~5Pa时导致的差别很小。
High-speed steel tool wear resistance and other properties mainly depends on its hardness and toughness. The effects of quenching temperature and cooling rate on the toughness of HSS were mainly studied. Several process specifications were simulated in laboratory and industrial heat treatment furnaces, respectively, and the static bending test was used to evaluate the toughness. In the same tempering conditions, the higher the quenching temperature, the higher the hardness obtained. The results show the relationship between hardness and toughness of HSS quenched at temperatures below 1200 ° C. Quenching temperature is higher than 1200 ℃, the toughness decreased significantly without significant increase in hardness. At the same time, the mechanical properties of M2 high speed steel with lower hardness after heat treatment are discussed. However, some cold work tools require lower heat treatment hardness. In this case, the effect of quenching and tempering from the lower temperature to the highest hardness is best. Finally, the results of the nitrogen quenching process in a vacuum furnace show that the low quenching pressure can slow down the cooling rate and reduce the material toughness, but the difference between quenching pressure (6 ~ 9) × 10 ~ 5Pa is very small.