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- W2163016912 abstract "Various novel heat treatments and thermomechanical treatment procedures have been developed recently in order to enhance mechanical properties of high-strength steels. These procedures rely on retained austenite in the microstructure to increase elongation, while keeping the high ultimate strength. One of these procedures is the Q&P process (Quenching and Partitioning). It produces martensite and retained austenite to obtain a strength of more than 2000 MPa and elongation levels of 10-15 %. The industrial application of this process is complicated by the need for quenching in the range between Ms and Mf. The Ms temperature normally lies in the 200-250 °C interval. This is why new steels with low Ms temperature were selected for the experimental programme. Thanks to this feature, the steels could be quenched in water or polymer-based baths. The primary alloying elements of these four selected steels were manganese, silicon, molybdenum and chromium. The development of the heat treatment sequence involved trials with various austenitizing temperatures, cooling rates, quenching temperatures and carbon partitioning temperatures. The experimental heat treatment led to microstructures of martensite with retained austenite in all steels. Their strengths were in the range of 1750-2400 MPa and their A5mm elongation levels were up to 10 %. The morphology and distribution of retained austenite dictate the resulting mechanical properties of the material. Therefore, the microstructure was observed using transmission electron microscopy. The distribution of retained austenite in martensite was examined using diffraction and bright and dark-field illumination." @default.
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- W2163016912 date "2014-01-01" @default.
- W2163016912 modified "2023-09-24" @default.
- W2163016912 title "High-strength martensitic steels with low M s temperature" @default.
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