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Diffusion Boronizing of H11 Hot Work Tool Steel

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Abstract

The H11 hot work tool steel was boronized at various processing parameters, austenitized, quenched, and tempered to a core hardness of 47-48 HRC. Microstructure, phase constitution, and microhardness of boronized layers were investigated. Effect of boronized region on the bulk properties was determined by the Charpy impact test. Structure of boronized regions is formed by the compound layers and diffusion inter-layer. The compound layers consisted of only (Fe,Cr)2B phase, but in the case of longer processing time, they contained also of the (Fe,Cr)B-phase. The inter-layer contained enhanced portion of carbides, formed due to carbon diffusion from the boride compounds toward the substrate. Microhardness of boronized layers exceeded considerably 2000 HV 0.1. However, boronizing led to a substantial lowering of the Charpy impact toughness of the material.

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Acknowledgments

The investigations were carried out on devices purchased thanks to the release of European structural funds within the project ICDAM.

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Authors and Affiliations

  1. Department of Materials Engineering, Faculty of Mechanical Engineering, Czech Technical University in Prague, Karlovo nám. 13, 121 35, Prague, Czech Republic

    Peter Jurči

  2. Faculty of Materials and Technology, Slovak Technical University, J. Bottu 52, 917 24, Trnava, Slovak Republic

    Mária Hudáková

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  1. Peter Jurči
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  2. Mária Hudáková
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Correspondence to Peter Jurči.

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Jurči, P., Hudáková, M. Diffusion Boronizing of H11 Hot Work Tool Steel. J. of Materi Eng and Perform 20, 1180–1187 (2011). https://doi.org/10.1007/s11665-010-9750-x

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  • DOI: https://doi.org/10.1007/s11665-010-9750-x

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