THE INFLUENCE OF Q&P PARAMETERS ON CARBIDE PRECIPITATION AND MECHANICAL PROPERTIES OF HIGH-CR MARTENSITIC STEEL

1 BAGROWSKA Magdalena
Co-authors:
1 GOŁASZEWSKI Adam 1 ŚWIĄTNICKI Wiesław
Institution:
1 Faculty of Materials Science and Engineering, Warsaw University of Technology, ul. Wołoska 141, 02-507 Warsaw, Poland, EU, magdalena.bagrowska@nanostal.eu
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
544-549
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
44 views / 18 downloads
Abstract

Quenching and Partitioning method of steel heat treatment (Q&P) [1-4] consists of two steps: partial martensitic quenching (Q) followed by short annealing i.e. partitioning step (P). During partitioning carbon atoms diffuse from supersaturated martensite laths or plates into surrounding untransformed austenite. This process leads to the stabilisation of retained austenite in steel after martensitic transformation. As a result, a two-phase microstructure is obtained. It consists of tempered martensite and stable retained austenite. The presence of stabilised austenite in steel improves the ductility of steel due to the TRIP effect (Transformation Induced Plasticity). The aim of this study was to design the parameters of Quenching and Partitioning (Q&P) process of X46Cr13 steel and to investigate the influence of the process parameters on the microstructure and on mechanical properties of this steel. The parameters of Q&P treatment were determined with the use of dilatometric measurements. To determine phase composition after Q&P process, magnetic measurements were conducted. The microstructure of martensite and austenite as well as the presence of carbides were examined through Transmission Electron Microscopy (TEM). Changes in hardness after various variants of Q&P treatment were also analysed.

Keywords: Martensitic stainless steel, carbide precipitations, Q&P processing, retained austenite.
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