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OPTIMIZATION OF HEAT TREATMENT OF CLOSED-DIE FORGINGS OF 2.5% MN STEEL

Citace:
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
Druh: STAŤ VE SBORNÍKU
Jazyk publikace: eng
Anglický název: OPTIMIZATION OF HEAT TREATMENT OF CLOSED-DIE FORGINGS OF 2.5% MN STEEL
Rok vydání: 2018
Místo konání: Ostrava
Název zdroje: TANGER Ltd., Keltickova 62, 710 00 Ostrava, Czech Republic, EU
Autoři: Mgr. Dagmar Bublíková , Dr. Ing. Hana Jirková , Ing. Štěpán Jeníček , Bc. Tomáš Janda
Abstrakt EN: 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.
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