Press Hardening on High-strength Steels with Higher Ductility Values

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23210%2F22%3A43965179" target="_blank" >RIV/49777513:23210/22:43965179 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Press Hardening on High-strength Steels with Higher Ductility Values

Original language description

Thanks to the properties of the produced components, press hardening is widely used to produce parts in the automotive industry. Therefore, materials with sufficient strength and especially high-energy absorption during an impact are sought for parts in the so-called “crumple zone”. Very promising materials are steels containing retained austenite, where deformation-induced martensitic transformation occurs during cold deformation. These are mainly TRIP or Q-P steels. The experimental program was carried out on the 0.2CMnSi TRIP steel with 0.2 % of carbon. Q-P steels were represented by 0.4CSiCr steel with 0.43 % of carbon and 1.33 % of Cr. 22MnB5 steel, which is commonly used for press hardening, was chosen as the reference material. For the proper treatment design, testing a wide range of parameters is necessary. Therefore, material-technological modelling on a thermomechanical simulator was used in the first step. The results obtained from material-technological modelling were verified in a real die for press hardening, which allows the formation of so-called omega profiles. After press hardening without isothermal hold, mixed ferritic-martensitic structures with a tensile strength over 940 MPa with an elongation of 9 % were obtained for 0.2CMnSi steel. Isothermal hold supported bainite formation and retained austenite stability. Therefore, the elongation was increased up to 34 %. For 0.4SiCr steel, after direct quenching in the die, a tensile strength of around 2000 MPa was obtained with very low ductility between 2 and 4%. The integration of the Q-P process led to an increase in ductility up to 16 %.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/TN01000015" target="_blank" >TN01000015: National Centre of Competence ENGINEERING</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů