Abstract
Novel alloys with high aluminum addition, so-called δ-transformation-induced plasticity (TRIP), have been developed recently for the third generation of advanced high strength steels for automotive applications, which are promising owing to the potential weldability as well as the combination of strength and ductility. In addition, the high aluminum addition results in a density reduction of approximately 5% in these δ-TRIP alloys without sacrificing the Young’s modulus in uniaxial tensile tests. The origin of δ-TRIP concept is introduced first with a review of the published work on δ-TRIP alloys. This review will include methodology for retention of δ-ferrite in casting, rolling and welding conditions, microstructure evolution by austempering, as well as microstructures–properties relationship involving the roles of blocky and lath retained austenite. In addition, currently unresolved problems will be discussed regarding the fundamentals of materials design, automotive application, and industrial manufacturing.
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Acknowledgements
The research was financially supported by the National Natural Science Foundation of China (Grant 51204051) and the China Postdoctoral Science Foundation (Grant 2012M510074), as well as by the Fundamental Research Funds for the Central Universities (Grant N120507001).
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Yi, H.L. Review on δ-Transformation-Induced Plasticity (TRIP) Steels with Low Density: The Concept and Current Progress. JOM 66, 1759–1769 (2014). https://doi.org/10.1007/s11837-014-1089-6
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DOI: https://doi.org/10.1007/s11837-014-1089-6