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Microstructure-Property Relationships of Novel Ultra-High-Strength Press Hardening Steels

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Abstract

The industrial significance of microalloyed martensitic steels manufactured via cold rolling, reaustenitization, and quenching has been typically recognized as low. However, it is currently believed that microalloying can improve the in-service properties of ultra-high-strength press hardening steels. In this work, five 34MnB5-based steels were designed to address the role of Ti and V when combined with Cr or Mo. Microstructure-property relationships were analyzed after die quenching and additional bake hardening (BH) heat treatment using advanced methods of microscopy, glow discharge optical emission spectroscopy, quasi-static tensile tests, and three-point bending tests. Results indicate that both Ti and V can provide grain size refinement through the formation of stabile nanosized precipitates. The BH treatment improved postuniform elongation values, indicating a trend of improved ductility. However, the expected improvements in bendability were clearly confirmed only for two V-microalloyed steels with the alloying concepts of 0.3Cr-0.15V-0.03Al-0.02Ti-0.0020B and 0.3Mo-0.15V-0.0060N (without Al-Ti-B additions) (wt pct). Thus, it was discovered that microalloying with V, when combined with either Cr or Mo, provides a promising combination of mechanical properties as far as the austenitization parameters are appropriately controlled.

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Acknowledgments

We thank Johan Lönnqvist and Christer Eggertson (Swerea KIMAB) for carrying out laboratory melts, Jussi Paavola (University of Oulu) for performing laboratory rolling of experimental steels, and Sanna Järn (SSAB Europe Oy) for implementing GDOES analysis. This study was financially supported by the Finnish Funding Agency for Technology and Innovation (Tekes) in the Breakthrough Steels and Applications Program of the Finnish Metals and Engineering Competence Cluster (FIMECC Ltd), which is gratefully acknowledged. The author thanks the Tampere University of Technology (TUT’s Graduate School), Emil Aaltonen Foundation, and Finnish Foundation for Technology Promotion for financial support.

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Authors and Affiliations

  1. Laboratory of Materials Science, Tampere University of Technology, P.O. Box 589, 33101, Tampere, Finland

    Henri Järvinen, Mari Honkanen & Pasi Peura

  2. SSAB Europe Oy, Harvialantie 420, 13300, Hämeenlinna, Finland

    Olli Oja & Martti Järvenpää

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  1. Henri Järvinen
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Correspondence to Henri Järvinen.

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Manuscript submitted July 10, 2018.

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Järvinen, H., Honkanen, M., Oja, O. et al. Microstructure-Property Relationships of Novel Ultra-High-Strength Press Hardening Steels. Metall Mater Trans A 50, 816–836 (2019). https://doi.org/10.1007/s11661-018-4967-7

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