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Recent progress in visualization and digitization of coherent transformation structures and application in high-strength steel
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Recent progress in visualization and digitization of coherent transformation structures and application in high-strength steel
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Journal Article
Recent progress in visualization and digitization of coherent transformation structures and application in high-strength steel
2024
Overview
High-strength steels are mainly composed of medium- or low-temperature microstructures, such as bainite or martensite, with coherent transformation characteristics. This type of microstructure has a high density of dislocations and fine crystallographic structural units, which ease the coordinated matching of high strength, toughness, and plasticity. Meanwhile, given its excellent welding performance, high-strength steel has been widely used in major engineering constructions, such as pipelines, ships, and bridges. However, visualization and digitization of the effective units of these coherent transformation structures using traditional methods (optical microscopy and scanning electron microscopy) is difficult due to their complex morphology. Moreover, the establishment of quantitative relationships with macroscopic mechanical properties and key process parameters presents additional difficulty. This article reviews the latest progress in microstructural visualization and digitization of high-strength steel, with a focus on the application of crystallographic methods in the development of high-strength steel plates and welding. We obtained the crystallographic data (Euler angle) of the transformed microstructures through electron back-scattering diffraction and combined them with the calculation of inverse transformation from bainite or martensite to austenite to determine the reconstruction of high-temperature parent austenite and orientation relationship (OR) during continuous cooling transformation. Furthermore, visualization of crystallographic packets, blocks, and variants based on actual OR and digitization of various grain boundaries can be effectively completed to establish quantitative relationships with alloy composition and key process parameters, thereby providing reverse design guidance for the development of high-strength steel.
Publisher
University of Science and Technology Beijing,Springer Nature B.V,Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China%State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China%State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China,Yangjiang Branch,Guangdong Laboratory for Materials Science and Technology (Yangjiang Advanced Alloys Laboratory),Yangjiang 529500,China
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