Journal of Materials Engineering and Performance

, Volume 27, Issue 4, pp 1514–1529 | Cite as

Investigation of the Microstructural Changes and Hardness Variations of Sub-Zero Treated Cr-V Ledeburitic Tool Steel Due to the Tempering Treatment

  • Peter Jurči
  • Mária Dománková
  • Jana Ptačinová
  • Matej Pašák
  • Martin Kusý
  • Petra Priknerová
Article
  • 33 Downloads

Abstract

The microstructure and tempering response of Cr-V ledeburitic steel Vanadis 6 subjected to sub-zero treatment at − 196 °C for 4 h have been examined with reference to the same steel after conventional heat treatment. The obtained experimental results infer that sub-zero treatment significantly reduces the retained austenite amount, makes an overall refinement of microstructure, and induces a significant increase in the number and population density of small globular carbides with a size 100-500 nm. At low tempering temperatures, the transient M3C-carbides precipitated, whereas their number was enhanced by sub-zero treatment. The presence of chromium-based M7C3 precipitates was evidenced after tempering at the temperature of normal secondary hardening; this phase was detected along with the M3C. Tempering above 470 °C converts almost all the retained austenite in conventionally quenched specimens while the transformation of retained austenite is rather accelerated in sub-zero treated material. As a result of tempering, a decrease in the population density of small globular carbides was recorded; however, the number of these particles retained much higher in sub-zero treated steel. Elevated hardness of sub-zero treated steel can be referred to more completed martensitic transformation and enhanced number of small globular carbides; this state is retained up to a tempering temperature of around 500 °C in certain extent. Correspondingly, lower as-tempered hardness of sub-zero treated steel tempered above 500 °C is referred to much lower contribution of the transformation of retained austenite, and to an expectedly lower amount of precipitated alloy carbides.

Keywords

Cr-V ledeburitic steel hardness microstructure precipitation sub-zero treatment tempering 

Notes

Acknowledgments

The authors acknowledge that the paper is a result of experiments realized within the Project VEGA 1/0735/14. In addition, this publication is the result of the Project implementation “Centre for Development and Application of Advanced Diagnostic Methods in Processing of Metallic and Non-Metallic Materials—APRODIMET”, ITMS: 26220120014, supported by the Research & Development Operational Programme funded by the ERDF.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Peter Jurči
    • 1
  • Mária Dománková
    • 1
  • Jana Ptačinová
    • 1
  • Matej Pašák
    • 1
  • Martin Kusý
    • 1
  • Petra Priknerová
    • 2
  1. 1.Faculty of Materials Science and Technology in TrnavaTrnavaSlovakia
  2. 2.Prikner - tepelné zpracování kovůMartínkoviceCzech Republic

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