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Microstructural Characterization of Ledeburitic Tool Steel after Sub- Zero Treatment and Tempering

机译：零零处理和回火后Ledeburitic工具钢的微观结构特征

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Microstructural characterization of ledeburitic tool steel Vanadis 6 after sub-zero treatment and tempering has been examined. The samples were heat treated using following schedules: heating to the austenitizing temperature (T_A = 1050 °C) in a vacuum furnace, hold at the final temperature for 30 min. and nitrogen gas quenching (5 bar). The sub-zero treatments consisted of immediate (after quenching) immersion of the material into the liquid helium (-269 °C), hold at the soaking temperature and removal the samples to be heated to a room temperature. Double tempering has been performed at the temperatures from the range 170 - 530 °C, whereas each tempering cycle was realized with a hold of 2 h. Typical heat treated microstructure of ledeburitic steels consists, besides of the martensitic matrix with certain amount of retained austenite, of several types of carbides -eutectic, secondary and small globular carbides. In sub-zero treated steel the amount of retained austenite is significantly reduced. The population density of small globular carbides increase as a result of sub-zero treating. Tempering of the material resulted in decrease in population density of small globular carbides with increasing the tempering temperature. The hardness of sub-zero treated material is higher than that of conventionally quenched one. Also, this tendency is preserved when the steel is low-temperature tempered. On the other hand, the hardness of conventionally quenched steel becomes higher than that of SZT one when tempered at the temperature of secondary hardening.
机译：亚零处理后LEDEBURITIC工具钢凡内斯6的微观结构表征。使用以下时间表进行热处理样品：在真空炉中加热到奥氏体化温度（T_A = 1050℃），在最终温度下保持30分钟。和氮气淬火（5巴）。次零治疗包括立即（在淬火）中将材料浸入液氦（-269℃）中，保持在浸泡温度下并将样品除去以加热至室温。在170-530°C的温度下进行了双回火，而每次回火循环以2小时的挤压实现。除了具有一定量的保留奥氏体的马氏体基质之外，典型的散热微观结构包括几种类型的碳化物，二次和小球状碳化物。在次零处理的钢中，保留奥氏体的量显着降低。由于次零治疗，小球状碳化物的人口密度增加。材料的回火导致小球状碳化物的人口密度随着升高的温度而降低。亚零处理材料的硬度高于常规淬火的硬度。而且，当钢是低温回火时，保存这种趋势。另一方面，当在二次硬化温度下回火时，常规淬火钢的硬度变得高于SZT钢的硬度。

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