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Fracture Micro Mechanism of Cryogenically Treated Ledeburitic Tool Steel

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Proceedings of the 9th International Conference on Fracture, Fatigue and Wear (FFW 2021 2021)

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Abstract

Fracture micro mechanism of cryogenically treated Cr-V ledeburitic tool steel was studied on fracture toughness testing specimens, by using the scanning electron microscopy and microanalysis. Experimental steel has been processed at different combinations of cryogenic temperatures (from the range −75 to −269 °C) and tempering regimes, producing different microstructures (martensite, retained austenite, carbides), hardness- and fracture toughness values (from the ranges 700–1000 HV and 13–20 MPa × m1/2, respectively). Conventionally quenched the same steel was considered as a reference. Generally, the obtained fracture surfaces manifest combined low-energetic ductile/cleavage crack propagation mode. The low-energetic ductile mode is associated with the presence of small globular carbides (size < 0.3 μm) that are produced by cryogenic treatments. On the other hand, cleavage mode is more pronounced with increased matrix stiffness, which is caused by the precipitation of nano-scaled transient carbides within the martensite. Also, differences in role of crack propagation between various carbides were determined. These differences are caused by crystallography of these phases as well as by their size. While small globular carbides (cementite) and dominant amount of the eutectic carbides (cubic MC-phase) assist more probably (by 50–60%) in ductile micro mechanism the coarser secondary particles (hexagonal M7C3-phase) are much more prone to cleavage cracking. This tendency increases with decreasing steel hardness since the matrix becomes more plastic, and the carbides cannot deform together with the matrix as they are much more brittle.

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Acknowledgements

The authors would like to acknowledge that the article is an outcome implementation of the following two projects: scientific project VEGA 1/0112/20 and APRODIMET, ITMS: 26220120048, supported by the Research and Development Operational Programme funded by the European Regional Development Fund.

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Authors and Affiliations

  1. Department of Materials Science, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology, Paulínská 16, 917 24, Trnava, Slovakia

    Peter Jurči

  2. Department of Materials Science, Slovak University, Paulínská 16, 917 24, Trnava, Slovakia

    Jana Ptačinová

  3. Institute of Physics of Materials, CEITEC-IPM, Academy of Sciences of the Czech Republic, Zizkova 22, 61662, Brno, Czech Republic

    Ivo Dlouhý

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  1. Peter Jurči
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  2. Jana Ptačinová
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Correspondence to Peter Jurči .

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Editors and Affiliations

  1. Faculty of Engineering and Architecture, Ghent University, Laboratory Soete, Zwijnaarde, Belgium

    Magd Abdel Wahab

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Jurči, P., Ptačinová, J., Dlouhý, I. (2022). Fracture Micro Mechanism of Cryogenically Treated Ledeburitic Tool Steel. In: Abdel Wahab, M. (eds) Proceedings of the 9th International Conference on Fracture, Fatigue and Wear . FFW 2021 2021. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-8810-2_6

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  • DOI: https://doi.org/10.1007/978-981-16-8810-2_6

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  • Online ISBN: 978-981-16-8810-2

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