Microstructure and Hardness of Cold Work Vanadis 6 Steel after Subzero Treatment at −140°C
| Autor: | Mária Hudáková, Jana Ptačinová, Peter Jurči, Juraj Ďurica, Martin Kusý |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Austenite Materials science Article Subject Scanning electron microscope Metallurgy General Engineering 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Carbide Diffusionless transformation Phase (matter) 0103 physical sciences Microscopy Tool steel engineering lcsh:TA401-492 General Materials Science lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
| Zdroj: | Advances in Materials Science and Engineering, Vol 2018 (2018) |
| ISSN: | 1687-8442 1687-8434 |
| Popis: | The microstructure, phase constitution, and hardness of Cr-V ledeburitic tool steel Vanadis 6 subjected to subzero treatment at −140°C and for different soaking times have been investigated. The light microscopy, scanning electron microscopy, and X-ray diffraction have been used for microstructural investigations. The hardness has been evaluated by the Vickers method. The obtained results assist to draw that subzero treatment reduces the retained austenite amount and increases the population density of carbides, compared to conventional heat treatment. The extent of decrease in the retained austenite amount makes around 85%, and the increase in population density of small globular carbides was approximately fivefold. High compressive stresses were identified in the retained austenite, and their 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. |
| Databáze: | OpenAIRE |
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