Název:	New treatment route for closed-die forgings of steels with 2.5% manganese
Autoři:	Bublíková, Dagmar Jeníček, Štěpán Peković, Michal Jirková, Hana
Citace zdrojového dokumentu:	BUBLÍKOVÁ, D., JENÍČEK, Š., PEKOVIĆ, M., JIRKOVÁ, H. New treatment route for closed-die forgings of steels with 2.5% manganese. Acta Metallurgica Slovaca, 2018, roč. 24, č. 2, s. 119-125. ISSN 1335-1532.
Datum vydání:	2018
Nakladatel:	Technical University of Košice
Typ dokumentu:	článek article
URI:	2-s2.0-85049201580 http://hdl.handle.net/11025/30913
ISSN:	1335-1532
Klíčová slova v dalším jazyce:	closed-die forgings;Q&P process;retained austenite;AHSS
Abstrakt v dalším jazyce:	The requirements placed on closed-die-forged parts of advanced steels have been increasing recently. Such forgings demand an innovative approach to both design and heat treatment. It is important to obtain high strength and sufficient ductility in closed-die forgings. High strength, mostly associated with martensitic microstructure, is often to the detriment of ductility. Ductility can be improved by incorporating a certain volume fraction of retained austenite in the resulting microstructure. Among heat treatment processes capable of producing martensite and retained austenite, there is the Q&P process (Quenching and Partitioning). This process is characterized by rapid cooling from the soaking temperature to the quenching temperature, which is between Ms and Mf, and subsequent reheating and holding at the partitioning temperature. Thus, strength levels of more than 2000 MPa combined with more than 10% elongation can be obtained. This experimental programme involved steels with 2.5% manganese. Forgings of these steels were heat treated using an innovative process in order to obtain an ultimate strength of more than 2000 MPa combined with sufficient elongation. Thanks to a higher manganese level, the Mf was depressed as low as 78°C, and therefore quenching was carried out not only in air but also in boiling water. Holding at the partitioning temperature of 180°C, when carbon migrates from super-saturated martensite to retained austenite, took place in a furnace. The effects of heat treatment parameters on the resulting mechanical properties and microstructure evolution in various locations of the forging were studied.
Práva:	Plný text je přístupný v rámci univerzity přihlášeným uživatelům. © Technical University of Košice
Vyskytuje se v kolekcích:	Články / Articles (RTI) OBD

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