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Microstructure and hardness of cold working Vanadis 6 steel after low temperature treatment − 140 ℃

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Document pages: 7 pages

Abstract: The microstructure, phase composition and hardness of CR-V ledeburite tool steel Vanadis 6 after low temperature treatment were studied at 140 ° C and different soaking time. Optical microscope, scanning electron microscope and X-ray diffraction have been used to study the microstructure. Hardness has been evaluated by Vickers hardness method. The results are helpful to conclude that compared with conventional heat treatment, low temperature treatment reduces the amount of retained austenite and increases the population density of carbides. The amount of retained austenite decreases by about 85 , and the population density of small spherical carbides increases by about five times. High compressive stress exists in retained austenite, andheir values follow the increase in carbide count. This makes a serious support to the theory explaining the formation of “extra” carbides as a by-product of more complete martensitic transformation. As a result of the mentioned microstructural changes, the material hardness increased from 875 ± 16 HV 10 up to 954.6 ± 14 HV 10 for conventionally quenched and SZT steels, respectively.

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