Manufacturing Technology 2015, 15(1):41-47 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/1/41

Long-term Sub-zero Treatment of P/M Vanadis 6 Ledeburitic Tool Steel - a Preliminary Study

Peter Jurči1,*, Martin Kusý1, Jana Ptačinová1, Vladimír Kuracina1, Petra Priknerová2
1 Faculty of Material Sciences and Technology in Trnava, Paulínská 16, 917 24 Trnava, Slovakia
2 Prikner - tepelné zpracování kovů, Martínkovice 279, 550 01, Czech Republic, Priknerová Petra

The microstructure, the phase constitution and the tempering charts of Cr-V ledeburitic steel Vanadis 6 subjected to sub-zero treatment with various soaking times in liquid nitrogen have been investigated. The microstructures have been characterized using the light microscopy, scanning electron microscopy and X-ray diffraction. The hardness has been evaluated by Vickers method. The matrix is martensitic with certain amount of retained austenite, irrespectively to the time of sub-zero treatment. The amount of retained austenite, however, decreases up to the soaking time of 17 h and then remains almost constant. The microstructure of sub-zero treated steel contains enhanced portion of small globular carbides, as compared to conventionally heat treated material. These particles have a size of around 100 nm in most cases. The as-quenched hardness manifests a moderate increase due to the sub-zero treatment. The hardness decreases during subsequent tempering and this decrease is more pronounced in sub-zero treated samples.

Keywords: Cr-V ledeburitic steel, sub-zero treatment, retained austenite and martensite, carbides, hardness

Published: February 1, 2015  Show citation

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Jurči P, Kusý M, Ptačinová J, Kuracina V, Priknerová P. Long-term Sub-zero Treatment of P/M Vanadis 6 Ledeburitic Tool Steel - a Preliminary Study. Manufacturing Technology. 2015;15(1):41-47. doi: 10.21062/ujep/x.2015/a/1213-2489/MT/15/1/41.
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