Title:	Optimization of heat treatment of closed-die forgings of 2.5% MN steel
Authors:	Bublíková, Dagmar Jirková, Hana Jeníček, Štěpán Janda, Tomáš
Citation:	BUBLÍKOVÁ, D., JIRKOVÁ, H., JENÍČEK, Š., JANDA, T. Optimization of heat treatment of closed-die forgings of 2.5% MN steel. In: Conference Proceedings - METAL 2018 - 27th International Conference on Metallurgy and Materials. Ostrava: TANGER Ltd., Keltickova 62, 710 00 Ostrava, Czech Republic, EU, 2018. s. 634-640. ISBN 978-80-87294-84-0.
Issue Date:	2018
Publisher:	Tanger
Document type:	konferenční příspěvek conferenceObject
URI:	2-s2.0-85059408671 http://hdl.handle.net/11025/30903
ISBN:	978-80-87294-84-0
Keywords in different language:	Closed-die forgings;Q&P process;retained austenite;material-technological modelling
Abstract in different language:	The forging industry seeks ways to improve mechanical properties of forged parts without using costly alloyed steels or complicated and time-consuming post-forge heat treatment. One of the available options is Q&P processing (Quenching and Partitioning) of advanced high-strength martensitic steels. The Q&P process is characterized by rapid cooling from the soaking temperature to a quenching temperature which is between the Ms and the Mf, and subsequent reheating to and holding at a partitioning temperature. Strength levels of more than 2000 MPa and elongation above 10 % can be obtained. Since the quench needs to be interrupted between the Ms and the Mf, new alloying strategies are being developed in order to depress the Mf below 100°C. With such steels, plain quenchants could be used, including boiling water. Using material-technological modelling, several heat treatment routes involving various cooling profiles were tested on three high-strength 2.5 % Mn steels with different Ni and Mo levels. The data for constructing the first model were acquired from a real-world treatment of a forged part. Quenching the forged part in boiling water and subsequent partitioning led to a strength of 2130 MPa and elongation of 12 %. Metallographic examination and measurement of mechanical properties were carried out on the experimental steels after the treatments.
Rights:	Plný text je přístupný v rámci univerzity přihlášeným uživatelům. © Tanger
Appears in Collections:	Konferenční příspěvky / Conference Papers (RTI) OBD

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