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Research on the Preparation and Mechanism of Ultrafine Crystallization of 20 Steel by Strong Spinning

机译：强旋压20钢超细晶的制备及机理研究

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摘要

The ultrafine crystallization of 20 steel can make it have higher tensile strength, corrosion resistance and thermal stability. Therefore, it is widely used in the fields of medical instruments, aerospace and passenger vehicle manufacturing. However, the development of spinning technology has been limited in the theoretical research stage. In this paper, the tube 20 steel is taken as the research object, and the ultra-fine grain forming process based on "three pass strong spinning - heat treatment - two pass common spinning - heat treatment" is proposed. On the basis of spinning process test, the ultimate thinning rate of this method is explored, and the evolution rule of its surface microstructure is analyzed by metallographic microscope. The results show that the multi pass spinning with small and medium thinning makes the grain structure elongate along the axial and tangential directions, and then refine. The uniformity of the axial fiber structure was improved. The research results are of great scientific significance to reduce the consumption of high-performance metals, improve the utilization rate and properties of materials, and promote the development of preparation technology of ultrafine grained metals.
机译：20钢的超细晶化可以使其具有更高的拉伸强度，耐腐蚀性和热稳定性。因此，它被广泛应用于医疗器械，航空航天和乘用车制造领域。但是，在理论研究阶段，纺丝技术的发展一直受到限制。本文以管20钢为研究对象，提出了一种基于“三道强旋—热处理—两道普通旋—热处理”的超细晶粒成形工艺。在纺丝工艺试验的基础上，探索了该方法的最终稀疏率，并通过金相显微镜分析了其表面微观结构的演变规律。结果表明，中，细稀疏的多道次纺丝使晶粒结构沿轴向和切线方向拉长，然后细化。轴向纤维结构的均匀性得到改善。研究结果对于减少高性能金属的消耗，提高材料的利用率和性能，促进超细晶粒金属制备技术的发展具有重要的科学意义。

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