The Transformation-Induced-Plasticity (TRIP) effect is used for enhancing the formability of cold formable sheet steels. While the first observation of this phenomenon dates back to the 1930's, the industrial usage of the TRIP steels started after 1950. First fully austenitic steels, later on multiphase steels have been developed with a meta-stable austenitic phase that can transform stress-assisted or strain-induced into eor a 0 -martensite during deformation. The historic development, the principles of the TRIP effect, and the different groups of steels using the TRIP effect are described. For the already commercialized TRIP steels, characteristic chemical compositions and microstructures are discussed; the requirements for the process design as well as new annealing concepts after cold rolling are explained. . Since 2016, he has been working in the Steel Institute of RWTH Aachen University as a scientific researcher. His research topic focuses on the microstructuremechanical properties relationship of high-Mn and medium-Mn steels.
In the automotive industry, the current development trend of lightweight and low-emission vehicles requests for high-performance materials. Benefiting from an excellent balance of mechanical properties and production cost, medium-Mn steels have attracted extensive interest by materials scientists. Austenite-reverted-transformation annealing plays a vital role in stabilisation of retained austenite and grain refinement, resulting in a considerable amount of retained austenite. Localised deformation phenomenon is usually observed in the ultrafine-grained medium-Mn steels owing to the absence of strain hardening. The occurrence of transformation-induced-plasticity and/or twinning-induced-plasticity effect in austenite improves strain hardening effectively. In the current review, austenite-reverted-transformation annealing treatment routine, mechanical properties and deformation mechanisms and effect of heat treatment on microstructure and mechanical properties of medium-Mn steels are summarised. This review was submitted as part of the 2017 Materials Literature Review Prize of the Institute of Materials, Minerals and Mining run by the Editorial Board of MST. Sponsorship of the prize by TWI Ltd is gratefully acknowledged
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