High-strength steels with bainitic structure and improved impact toughness

IF 0.8 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Metallurgist Pub Date : 2025-05-20 DOI:10.1007/s11015-025-01914-7

M. V. Maisuradze, A. A. Kuklina, V. V. Nazarova, E. V. Antakov

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Abstract

Based on statistical processing of experimental data and thermodynamic calculations, compositions of high strength steels with bainitic structure and improved impact toughness were proposed. The stability of undercooled austenite and the ratio of the impact toughness of lower bainite to that of martensite were used as criteria for developing the steel compositions. The relative impact toughness of lower bainite correlates with the value of ∆T₀, which characterizes the position of the T′₀ = f(%C) dependence on the equilibrium diagram for a given steel composition relative to the theoretical dependence for the Fe–C system. Experimental CCT (continuous cooling transformation) diagrams of undercooled austenite transformation in the developed steels were constructed. Analysis of dilatometry curves and microstructure of the steels after continuous cooling at rates of 0.1–30 °C/s allowed the determination of the quantitative ratio of structural constituents. The mechanical properties of martensitic and bainitic microstructures in the investigated steels were determined. A comprehensive criterion for the mechanical properties of engineering steels, including strength, plasticity, and impact toughness, was proposed.

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具有贝氏体组织和提高冲击韧性的高强度钢

通过对实验数据的统计处理和热力学计算，提出了具有贝氏体组织和提高冲击韧性的高强钢成分。以过冷奥氏体的稳定性和下贝氏体与马氏体的冲击韧性之比作为发展钢成分的标准。下贝氏体的相对冲击韧性与∆T0的值有关，它表征了T ' 0 = f（%C）对给定钢成分平衡图的依赖关系相对于Fe-C体系的理论依赖关系的位置。建立了所研制钢过冷奥氏体转变的连续冷却实验图。在0.1-30 °C/s连续冷却后，通过分析膨胀曲线和钢的微观组织，可以确定组织成分的定量比例。测定了所研究钢中马氏体和贝氏体组织的力学性能。提出了工程钢的综合力学性能标准，包括强度、塑性和冲击韧性。

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来源期刊

Metallurgist 工程技术-冶金工程

CiteScore

1.50

自引率

44.40%

发文量

151

审稿时长

4-8 weeks

期刊介绍： Metallurgist is the leading Russian journal in metallurgy. Publication started in 1956. Basic topics covered include: State of the art and development of enterprises in ferrous and nonferrous metallurgy and mining; Metallurgy of ferrous, nonferrous, rare, and precious metals; Metallurgical equipment; Automation and control; Protection of labor; Protection of the environment; Resources and energy saving; Quality and certification; History of metallurgy; Inventions (patents).