304 不锈钢/Q235 碳钢双金属轴的交叉楔形轧制变形规律和结合机理

IF 2.5 2区 材料科学
Le Zhu, Chao-yang Sun, Bao-yu Wang, Jing Zhou
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引用次数: 0

摘要

通过交叉楔形轧制(CWR)制备了 304 不锈钢(SS)/Q235 碳钢(CS)双金属复合材料轴。通过 CWR 轧制实验和有限元模拟,以及元素扩散、微观结构分析和机械性能测试,研究了结合界面的焊接机理。根据模拟研究,结合界面主要在工具-工件接触区受到三向压应力。随着压缩比从 0.25 增加到 0.35,界面的应力穿透区域增大,而 CS/SS 双金属轴的直径和壁厚减小,因此厚径比保持不变,这有利于内外金属和焊接接头界面的协调变形。界面的微观结构分析表明,附着处没有明显的缺陷和裂纹,CS 侧的微观结构以铁素体和马氏体相为主。在脱碳效应的作用下,Q235 钢的显微组织以粗大的铁素体为特征,在靠近晶粒细化界面的 SS 侧还伴有厚度约为 20 μm 的渗碳层。随着径向压缩比的增加,Cr、Ni 和其他元素的扩散距离增加,脱碳层的平均厚度减小,界面结合强度从 450 兆帕增加到 490 兆帕,从而改善了界面的冶金结合。该研究表明,使用 304 SS 和 Q235 CS 制作横楔轧制复合材料轴是可行的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Cross wedge rolling deformation law and bonding mechanism of 304 stainless steel/Q235 carbon steel bimetallic shaft

Cross wedge rolling deformation law and bonding mechanism of 304 stainless steel/Q235 carbon steel bimetallic shaft

304 stainless steel (SS)/Q235 carbon steel (CS) bimetallic composite shafts were prepared by the cross wedge rolling (CWR). The bonding interface welding mechanism was investigated through CWR rolling experiments and finite element simulation, as well as element diffusion, microstructure analysis, and mechanical property tests. According to simulation studies, the bonding interface is primarily subjected to three-directional compressive stresses at the tool–workpiece contact zone. As compression ratio increases from 0.25 to 0.35, the interface of the stress penetration area increases, while the diameter and wall thickness of CS/SS bimetallic shaft decrease, and hence, thickness-to-diameter ratio remains unchanged, which is conducive to the coordinated deformation of inner and outer metals and the interface of welded joints. The microstructure analysis of the interface shows that there are no obvious defects and cracks in the attachment, and that the microstructure on CS side is dominated by ferrite and martensite phases. Caused by the decarburization effect, Q235 steel microstructure features coarse ferrite, accompanied by a carburized layer with a thickness of about 20 μm on SS side near the interface where grains are refined. As radial compression ratio increases, the diffusion distance of Cr, Ni, and other elements increases, the average thickness of the decarburized layer decreases, the interfacial bonding strength increases from 450 to 490 MPa, and metallurgical bonding at the interface is thus improved. The study demonstrates that it is feasible to use 304 SS and Q235 CS for cross wedge rolling composite shafts.

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来源期刊
自引率
16.00%
发文量
161
审稿时长
2.8 months
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..
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