超快加热对 2.2 GPa 级热成型钢微观结构和力学性能的影响

IF 2.6 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals Pub Date : 2024-09-02 DOI:10.3390/met14091006

Mai Wang, Jiang Chang, Hongyi Wu, Zhenli Mi, Yanxin Wu, Qi Zhang

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引用次数: 0

摘要

本研究旨在评估超快加热对热成型钢微观结构和机械性能的影响。本研究采用的初始微观结构是冷轧微观结构，试验钢以 200 °C/s 的速度加热至完全奥氏体化，然后进行水淬。据观察，超快加热过程显著细化了先前的奥氏体晶粒和马氏体板条，同时继承了初始冷轧显微组织中的高密度位错。因此，位错强化和晶粒细化强化之间的耦合机制显著提高了试验钢的屈服强度和极限抗拉强度。最终，热成型钢的屈服强度达到了 1524 兆帕，极限抗拉强度为 2221 兆帕，均匀伸长率为 5.2%。

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The Effect of Ultrafast Heating on the Microstructure and Mechanical Properties of the 2.2 GPa Grade Hot Forming Steel

The aim of the present work is to evaluate the effect of ultrafast heating on the microstructure and mechanical properties of hot forming steel. The initial microstructure utilized in this study was a cold-rolled microstructure, and the test steel was heated to full austenitization at a rate of 200 °C/s, followed by water quenching. It was observed that the ultrafast heating process significantly refines both the prior austenite grains and martensite laths while inheriting high-density dislocations from the initial cold-rolled microstructure. Consequently, the coupling mechanism between dislocation strengthening and grain refinement strengthening remarkably enhanced both the yield strength and ultimate tensile strength of the test steel. Eventually, the yield strength of the hot forming steel reached 1524 MPa, along with an ultimate tensile strength of 2221 MPa and uniform elongation of 5.2%.

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来源期刊

Metals MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

4.90

自引率

13.80%

发文量

1832

审稿时长

1.5 months

期刊介绍： Metals (ISSN 2075-4701) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Metals provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of metals.