Influence of band microstructure on carbide precipitation behavior and toughness of 1 GPa-grade ultra-heavy gauge low-alloy steel

Peng Han; Zhipeng Liu; Zhenjia Xie; Hua Wang; Yaohui Jin; Xuelin Wang; Chengjia Shang

doi:10.1007/s12613-023-2597-6

Volume 30 Issue 7

Jul. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(7): 1329-1337

Peng Han, Zhipeng Liu, Zhenjia Xie, Hua Wang, Yaohui Jin, Xuelin Wang, and Chengjia Shang, Influence of band microstructure on carbide precipitation behavior and toughness of 1 GPa-grade ultra-heavy gauge low-alloy steel, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1329-1337. https://doi.org/10.1007/s12613-023-2597-6

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Peng Han, Zhipeng Liu, Zhenjia Xie, Hua Wang, Yaohui Jin, Xuelin Wang, and Chengjia Shang, Influence of band microstructure on carbide precipitation behavior and toughness of 1 GPa-grade ultra-heavy gauge low-alloy steel, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1329-1337. https://doi.org/10.1007/s12613-023-2597-6

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Research Article

Influence of band microstructure on carbide precipitation behavior and toughness of 1 GPa-grade ultra-heavy gauge low-alloy steel

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Corresponding author:
Zhenjia Xie E-mail: zjxie@ustb.edu.cn
Received: 29 September 2022; Revised: 26 December 2022; Accepted: 6 January 2023; Available online: 10 January 2023

Abstract

Abstract

This study investigated the influence of band microstructure induced by centerline segregation on carbide precipitation behavior and toughness in an 80 mm-thick 1 GPa low-carbon low-alloy steel plate. The quarter-thickness (1/4t) and half-thickness (1/2t) regions of the plate exhibited similar ductility and toughness after quenching. After tempering, the 1/4t region exhibited ~50% and ~25% enhancements in both the total elongation and low-temperature toughness at −40°C, respectively, without a decrease in yield strength, whereas the toughness of the 1/2t region decreased by ~46%. After quenching, both the 1/4t and 1/2t regions exhibited lower bainite and lath martensite concentrations, but only the 1/2t region exhibited microstructure bands. Moreover, the tempered 1/4t region featured uniformly dispersed short rod-like M₂₃C₆ carbides, and spherical MC precipitates with diameters of ~20–100 nm and <20 nm, respectively. The uniformly dispersed nanosized M₂₃C₆ carbides and MC precipitates contributed to the balance of high strength and high toughness. The band microstructure of the tempered 1/2t region featured a high density of large needle-like M₃C carbides. The length and width of the large M₃C carbides were ~200–500 nm and ~20–50 nm, respectively. Fractography analysis revealed that the high density of large carbides led to delamination cleavage fracture, which significantly deteriorated toughness.
- band microstructure;
- carbides;
- toughness;
- heavy gauge steel;
- centerline segregation

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