Enhancing charpy absorbed energy of aged duplex lightweight steel plates through TRIP and TWIP mechanisms

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-09-25 DOI:10.1016/j.matchar.2024.114413

Yong Hee Jo , Hyung-Jun Cho , Junha Yang , Sukjin Lee

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引用次数: 0

Abstract

Ensuring toughness in thick hot-rolled plates remains a challenge for lightweight steels in automotive, shipbuilding, military, and construction industries despite improved tensile properties. This study investigated the Charpy absorbed energy of thick hot-rolled Fe-0.4C-15Mn-6Al duplex lightweight steel plates exhibiting TRIP and TWIP mechanisms, aged at 450–500 °C to precipitate κ-carbides. Fracture initiation and propagation energies measured from instrumented Charpy impact testing were analyzed through microstructural and microfracture analyses. The 500 °C-aged (A500) specimen showed the highest Charpy absorbed energy, composed of the highest fracture initiation and propagation energies across all test temperatures, particularly due to active TWIP and TRIP mechanisms along with significant κ-carbide precipitation strengthening. Despite predominantly ductile fracture modes, regardless of aging temperature and test temperature, deformation mechanisms were influenced by stacking fault energy (SFE). Aging resulted in κ-carbide precipitation, reducing C and Mn contents in austenite and lowering SFE. At 25 °C, the superior energy absorption of the A500 specimen (296 J) was attributed to its high flow stress and extensive roughness in the fracture surface due to crack deflection in the fracture initiation region and zigzag crack propagation. The Charpy absorbed energy decreased significantly at lower temperatures due to limited development of slip line field and less zigzag crack propagation. Despite this, the A500 specimen maintained the highest energy absorption due to its optimized TWIP and TRIP mechanisms and κ-carbide precipitation strengthening.

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通过 TRIP 和 TWIP 机制提高时效双相轻质钢板的夏比吸收能

尽管汽车、造船、军事和建筑行业的轻质钢材的拉伸性能有所改善，但如何确保热轧厚钢板的韧性仍然是一项挑战。本研究调查了在 450-500 °C 下老化以析出κ-碳化物的厚热轧 Fe-0.4C-15Mn-6Al 双相轻质钢板在 TRIP 和 TWIP 机制下的夏比吸收能。通过微观结构和微观断裂分析，对仪器夏比冲击试验测得的断裂起始和扩展能量进行了分析。500 °C 老化（A500）试样显示出最高的夏比吸收能，在所有测试温度下都具有最高的断裂萌发能和扩展能，特别是由于活跃的 TWIP 和 TRIP 机制以及显著的 κ 碳化物沉淀强化。尽管主要是韧性断裂模式，但无论老化温度和测试温度如何，变形机制都受到堆积断层能（SFE）的影响。时效导致κ-碳化物析出，减少了奥氏体中的C和Mn含量，降低了SFE。25 °C时，A500试样的能量吸收较好（296 J），这是因为其流动应力较高，断裂起始区域的裂纹偏转和之字形裂纹扩展导致断裂表面粗糙度较大。在较低温度下，由于滑移线场的发展有限，人字形裂纹扩展较少，夏比吸收能明显下降。尽管如此，由于优化了 TWIP 和 TRIP 机制以及 κ 碳化物沉淀强化，A500 试样仍保持了最高的能量吸收率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.