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

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Minerals, Metallurgy, and Materials Pub Date : 2023-05-13 DOI:10.1007/s12613-023-2597-6

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

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引用次数: 1

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.

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带状组织对1gpa级特重规低合金钢碳化物析出行为及韧性的影响

研究了80mm厚1 GPa低碳低合金钢中线偏析诱导的带状组织对碳化物析出行为和韧性的影响。淬火后，四分之一厚度(1/4t)和半厚度(1/2t)区域的延展性和韧性相似。回火后，1/4t区域的总伸长率和低温韧性分别提高了~ 50%和~ 25%，而屈服强度没有下降，而1/2t区域的韧性下降了~ 46%。淬火后，1/4t和1/2t区域均出现较低的贝氏体和板条马氏体浓度，但只有1/2t区域出现了显微组织条带。回火后的1/4t区域中存在均匀分散的短棒状M23C6碳化物和直径分别为20 ~ 100 nm和20 nm的球形MC析出物。均匀分散的纳米级M23C6碳化物和MC析出物有助于实现高强度和高韧性的平衡。回火后1/2t区的带状组织以高密度的针状大碳化物为主。大型M3C碳化物的长度和宽度分别为~ 200 ~ 500 nm和~ 20 ~ 50 nm。断口形貌分析表明，高密度的大碳化物导致了分层解理断裂，导致韧性显著降低。

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来源期刊

International Journal of Minerals, Metallurgy, and Materials 工程技术-材料科学：综合

CiteScore

9.30

自引率

16.70%

发文量

205

审稿时长

2 months

期刊介绍： International Journal of Minerals, Metallurgy and Materials (Formerly known as Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material) provides an international medium for the publication of theoretical and experimental studies related to the fields of Minerals, Metallurgy and Materials. Papers dealing with minerals processing, mining, mine safety, environmental pollution and protection of mines, process metallurgy, metallurgical physical chemistry, structure and physical properties of materials, corrosion and resistance of materials, are viewed as suitable for publication.