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Fracture toughness behavior of low-C medium-Mn high-strength steel with submicron-scale laminated microstructure of tempered martensite and reversed austenite

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Abstract

Fracture toughness was studied in terms of crack-tip opening displacement (CTOD) in low-C medium-Mn high-strength steel at both room temperature and − 40 °C, and excellent fracture toughness was obtained. The critical CTOD values (δ) and crack extension (∆a) followed the relationship: δ = 0.01343 + 0.62315∆a0.47531 and δ = 0.07391 + 0.48466∆a0.60103 at room temperature and − 40 °C, respectively. With the decrease in test temperature from room temperature to − 40 °C, the corresponding δ when ∆a = 0.2 mm (δ0.2) was reduced from 0.30341 to 0.25813 mm, and intersecting point in the crack extension resistance curve with a 0.2-mm passivation line (δQ0.2BL) was reduced from 0.42132 to 0.33941 mm. The large fraction of high misorientation boundaries between tempered martensite effectively hindered the crack propagation and increased the fracture toughness. Furthermore, the submicron-scale complex laminated microstructure of tempered martensite and reversed austenite refined the effective fracture grain size, which inhibited crack propagation and led to high fracture toughness. Also, the excellent fracture toughness is attributed to strain-induced martensite transformation of reversed austenite in the small plastic deformation zone ahead of the crack tip, which absorbed the strain energy, relaxed the local stress concentration, suppressed the crack propagation, and enhanced the fracture toughness.

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Acknowledgements

The authors gratefully appreciate the financial support by the National High-tech R&D Program (863 Program) [Grant No. 2015AA03A501], the National Natural Science Foundation of China [Grant No. 51604072], and the Fundamental Research Funds for the Central Universities [Grant No. N170704016]. R.D.K. Misra also acknowledges continued collaboration with the Northeastern University as an Honorary Professor providing guidance to students in research.

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Authors and Affiliations

  1. The State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang, 110819, China

    Xiangyu Qi, Linxiu Du, Ying Dong, Yu Du, Hongyan Wu & Xiuhua Gao

  2. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas, El Paso, TX, 79968-0521, USA

    R. D. K. Misra

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  1. Xiangyu Qi
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Correspondence to Linxiu Du.

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Qi, X., Du, L., Dong, Y. et al. Fracture toughness behavior of low-C medium-Mn high-strength steel with submicron-scale laminated microstructure of tempered martensite and reversed austenite. J Mater Sci 54, 12095–12105 (2019). https://doi.org/10.1007/s10853-019-03776-2

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