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Heat Treatment Design to Modify the Martensite Misorientation and Obtain Superior Strength–Toughness Combinations

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Abstract

A heat treatment methodology is described for obtaining ultra-high strength (> 1700 MPa) and increased − 40 °C toughness (> 45 J/cm2) in a steel. Thermodynamic approach to design heat treatments is demonstrated and utilized to produce refinement of the prior austenite grain size leading to superior properties. The cleavage energy was shown to correlate to both prior austenite grain size, according to an inverse root relationship, as well as the density of high-angle martensite lath boundaries.

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This research was supported in part by Congressional support through the Combat Vehicle Weight Reduction Initiative. Dr. D.M. Field was supported by a research appointment at the U.S. Army Research Laboratory accomplished under Cooperative Agreement Number W911NF-18-2-0046. The authors would like to thank Mr. Micah Gallagher, Mr. Steven Marsh, and Mr. Mike Aniska for their assistance in this project. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the U.S. Army Research Laboratory or of the U.S. Government.

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  1. Weapons and Material Research Directorate, US Army Combat Capabilities Development Command Army Research Laboratory, Aberdeen Proving Ground, MD, 21005, USA

    D. M. Field, J. S. Montgomery, K. R. Limmer & K. Cho

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  1. D. M. Field
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  2. J. S. Montgomery
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  3. K. R. Limmer
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  4. K. Cho
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Correspondence to D. M. Field.

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Manuscript submitted September 10, 2019.

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Field, D.M., Montgomery, J.S., Limmer, K.R. et al. Heat Treatment Design to Modify the Martensite Misorientation and Obtain Superior Strength–Toughness Combinations. Metall Mater Trans A 51, 1038–1043 (2020). https://doi.org/10.1007/s11661-019-05599-x

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