Ultra-Fine Grained Steels

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This book comprises ten chapters that systematically describe research achievements related to ultra-fine grain steels and their engineering applications. It introduces new theories on microstructural refinement and innovative production technologies for high strength and high toughness steels, emphasizing the integration of materials science with engineering technology. Key theories include the deformation induced ferrite transformation (DIFT) for ferrite-pearlite steels and the discovery of ultra-fine grain refinement effects due to existing nanometer-sized precipitates in steels produced via thin slab casting and rolling (TSCR). Additionally, it proposes theories on deformation induced precipitation and medium temperature phase transformation control for bainitic steels, as well as the resistance against delayed fracturing in high strength and toughness alloy structural steels. The book also covers production technologies aimed at achieving ultra-fine grains and enhancing steel properties, including chemical metallurgy, solidification techniques, and welding methods. Furthermore, it details trial and commercial applications of ultra-fine grain high strength and toughness steels in civil construction, automobile manufacturing, and engineering machinery, providing valuable theoretical concepts and practical technologies for research, production, and application in this field.