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Andrea Di Schino1*, Paolo Emilio Di Nunzio2, Sabrina Mengaroni2, Pablo Rodriguez-Calvillo3 and Josè Maria Cabrera4


1. Dipartimento di Ingegneria, Università degli Studi di Perugia, Via G. Duranti 93, Perugia, 06125, Italy
2. Centro Sviluppo Materiali SpA, Via di Castel Romano 100,Roma, 00128, Italy
3. Arcelor Mittal Global R&D Gent, Belgium
4. Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, Universitat Politècnica de Catalunya, Barcelona, Spain


The present study is focused on analyzing the effect of Mn amount on two experimental steel compositions, specially designed for Q&P (Quenching and Partitioning), 0.15C-2.5Mn-1.5Si and 0.15C-3Mn-1.5Si without significant contribution of Al. Two-Step Q&P thermal treatments were performed at laboratory scale in a quenching dilatometer Bähr DIL805A/D. The fractions of retained austenite were evaluated by X-ray diffraction techniques. The mechanical properties of the Q&P samples were evaluated, a strong dependence of strength, uniform elongation and strain hardening values on process parameters has been found. Higher uniform elongation were related to higher residual austenite contents. The 0.15C-3Mn-1.5Si steel showed systematically the largest mechanical values with respect to the 0.15C-2.5Mn-1.5Si steel.


Steels, Q&P, mechanical properties.

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