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Improving the Low-Temperature Toughness of a High-Strength, Low-Alloy Steel with a Lamellarization Heat Treatment

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Abstract

A 15-min lamellarization (QL) heat treatment near the \(A_{c3}\) was applied to a 0.15C–3Ni–1.6Cr–0.5Mo HY-80 steel to increase its low-temperature toughness. The resultant microstructure and mechanical properties were characterized via microscopy, high-energy x-ray diffraction (HEXRD), quasi-static tensile testing, and Charpy impact testing. The results from the QL treatment were compared to a baseline of quench-and-tempered (QT) HY-80. When measured by HEXRD, the QL treatment increased both the volume fraction and lattice parameter of retained austenite, which is indicative of a more film-like austenite phase. This was accompanied by an increase in the low-temperature impact toughness versus the baseline QT condition without a significant decrease in the 0.2% offset yield strength, most likely due to the different austenite phase. The optimization of this film-like austenite phase may produce better low-alloy steels for low-temperature service without the cost of higher alloy contents.

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Acknowledgements

The authors would like to acknowledge several individuals and organizations for their help with this work. Drs. Matthew Draper and Paul Lambert at the Naval Surface Warfare Center, Carderock Division for their consultation and encouragement. Dr. Lambert also generously offer to share some of his beam time at APS and his knowledge on analyzing HEXRD data with us. Dr. Jun-Sang Park and the rest of the staff at the Advanced Photon Source and the 1-ID beamline for their amazing work not only for testing our samples, but but also for operating such a wonderful facility that enables incredible scientific advancement. Additionally, the Steel Founders’ Society of America also generously supported this research, providing guidance on industrial casting processes. Partial financial support was provided by DLA-Troop Support, Philadelpha, PA and the Defense Logistics Agency Information Operations, J68, Research & Development, Ft. Belvoir, VA (Grant Number: SP4701-20-C-0076). Disclaimer: The publication of this material does not constitute approval by the government of the findings or conclusion herein. Wide distribution or announcement of this material shall not be made without specific approval by the sponsoring government activity.

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  1. Yusra Anwar and Aphrodite Strifas have contributed equally to this work.

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  1. Materials Science and Engineering, University of Maryland, College Park, College Park, MD, 20742, USA

    Matthew Frichtl, Yusra Anwar, Aphrodite Strifas & Sreeramamurthy Ankem

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  1. Matthew Frichtl
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Correspondence to Matthew Frichtl.

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Frichtl, M., Anwar, Y., Strifas, A. et al. Improving the Low-Temperature Toughness of a High-Strength, Low-Alloy Steel with a Lamellarization Heat Treatment. Met. Mater. Int. 29, 879–891 (2023). https://doi.org/10.1007/s12540-022-01291-9

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