Ru Su, Xiong-wei Zheng, Jie Kang, Da-yong Wu, Hai-kun Ma, Fu-cheng Zhang, Zhi-nan Yang, Qing Li
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引用次数: 0
摘要
通过实验和代表性体积元素模拟相结合的方法,研究了中碳无碳贝氏体钢的微观结构、性能和应变分配行为之间的相关性。结果表明,随着奥氏体回火温度从低温升至中温,性能的最佳平衡点从强度-韧性转变为塑性-韧性。在低奥氏体回火温度(270 °C)下形成的细贝氏体铁素体板和贝氏体波浪能提高强度和韧性。相反,在中等温度(350 °C)下奥氏体回火得到的残余奥氏体(RA)的尺寸和形状分布较广,有助于提高加工硬化能力,从而增强塑性。在相对较高的奥氏体回火温度下,韧性膜状 RA 的体积分数对提高冲击韧性起着至关重要的作用。在拉伸变形模拟中,等效塑性应变主要集中在邻近马氏体的贝氏体铁素体中,而等效塑性应变则均匀分布在薄膜状保留奥氏体和贝氏体铁素体之间。据预测,裂纹将出现在应变集中的马氏体和贝氏体铁素体界面,并最终沿着应变破坏区扩展。
Microstructure–property correlation and strain partitioning behavior in medium-carbon carbide-free bainitic steel
The correlation between the microstructure, properties, and strain partitioning behavior in a medium-carbon carbide-free bainitic steel was investigated through a combination of experiments and representative volume element simulations. The results reveal that as the austempering temperature increases from low to intermediate, the optimal balance of properties shifts from strength–toughness to plasticity–toughness. The formation of fine bainitic ferrite plates and bainite sheaves under low austempering temperature (270 °C) enhances both strength and toughness. Conversely, the wide size and shape distribution of the retained austenite (RA) obtained through austempering at intermediate temperature (350 °C) contribute to increased work-hardening capacity, resulting in enhanced plasticity. The volume fraction of the ductile film-like RA plays a crucial role in enhancing impact toughness under relatively higher austempering temperatures. In the simulations of tensile deformation, the concentration of equivalent plastic strain predominantly manifests in the bainitic ferrite neighboring the martensite, whereas the equivalent plastic strain evenly spreads between the thin film-like retained austenite and bainitic ferrite. It is predicted that the cracks will occur at the interface between martensite and bainitic ferrite where the strain is concentrated, and eventually propagate along the strain failure zone.
期刊介绍:
Publishes critically reviewed original research of archival significance
Covers hydrometallurgy, pyrometallurgy, electrometallurgy, transport phenomena, process control, physical chemistry, solidification, mechanical working, solid state reactions, materials processing, and more
Includes welding & joining, surface treatment, mathematical modeling, corrosion, wear and abrasion
Journal of Iron and Steel Research International publishes original papers and occasional invited reviews on aspects of research and technology in the process metallurgy and metallic materials. Coverage emphasizes the relationships among the processing, structure and properties of metals, including advanced steel materials, superalloy, intermetallics, metallic functional materials, powder metallurgy, structural titanium alloy, composite steel materials, high entropy alloy, amorphous alloys, metallic nanomaterials, etc..