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Mechanisms of strength-plasticity enhancement and stress-induced phase transition in a medium-carbon low-alloy steel

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Journal of Iron and Steel Research International 2024年第9期31卷 2255-2270页

作者： Meng-wei Lu Xin Chen Wen-xi Liu Yu-ru Chen Qi Li Kai Wang Zu-min Wang Yuan Huang Institute of Advanced Metallic Materials School of Materials Science and EngineeringTianjin UniversityTianjin300350China

A medium-carbon low-alloy steel with designed chemical composition was *** steel exhibits an excellent product of strength and elongation value of 31,832 MPa%through quenching and partitioning treatment,with a tensile strength of 1413 MPa and elongation of 22%.X-ray diffraction analysis and transmission electron microscopy characterizations confirm that the retained austenite in the specimens undergoes stress-induced phase transformation to the martensite and hexagonal phases,namely the transformation-induced plasticity(TRIP)effect is *** TRIP effect,triggered by the stress-induced phase transition of retained austenite,is responsible for the excellent mechanical properties obtained in the *** further investigating the stress-induced phase transition mechanism,thermodynamic methods are *** free energy of face-centered cubic-Fe,ε-Fe,ω-Fe and body-centered cubic-Fe associated with the stress-induced phase transition was calculated using molecular dynamics simulations,and a calculation method of strain energy in thermodynamic units for the stress-induced martensitic transformation is *** final results reveal the process and thermodynamic mechanism of stress-induced martensitic transformation in medium-carbon steels,in which the hexagonal phase can participate in the process as an intermediate product.

关键词： Medium-carbon low-alloy steel product of strength and elongation Stress-induced martensitic transformation Transformation-induced plasticity effect ω-Fe phase

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Effects of annealing temperature on microstructure and properties of tailor-rolled blank of medium-manganese steel

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Journal of Iron and Steel Research International 2020年第8期27卷 933-939页

作者： Ying Zhi Di-wen Ke Xiang-hua Liu Zhi-xin Feng State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina

The microstructure and mechanical properties of tailor-rolled blank (TRB) of medium-manganese steel during annealing were investigated. The annealing process of austenite-reverted transformation of the experimental steel was formulated. The effects of different morphologies on properties with different annealing temperatures in different thickness zones of TRB were analyzed. In the thin zone, the morphology is blocky, and in the thick zone, the morphology is lamellar. At the same annealing temperature, the tensile strength of the thick zone is lower than that of the thin zone, and the elongation and product of strength and elongation (PSE) of the thick zone are higher than those of the thin zone. With the increase in annealing temperature, the tensile strength increases, while the yield strength, the elongation and the PSE all decrease in the same thickness zone. Because the stability of lamellar austenite is higher than that of blocky austenite, the comprehensive mechanical properties in the thick zone are good. At the annealing temperature of 640 ℃, the experimental steel has the best comprehensive mechanical properties, and the maximum PSE is more than 40.0 GPa% in different thickness zones. Particularly, PSE is up to 45.6 GPa% in the thickness zone of 2.0 mm.

关键词： Tailor-rolled blank Medium-manganese steel Annealing temperature Austenite-reverted transformation product of strength and elongation

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