HARDNESS OF TOOL STEEL 55NICRMOV7 AFTER FOUR DIFFERENT TREATMENT TYPES

1 MAZANCOVÁ Eva
Co-authors:
2 KUČERA Pavel 3 ŠOFER Michal
Institutions:
1 VŠB-Technical University of Ostrava, Faculty of Materials Science and Technology, 17. listopadu 15/ 2172, 708 33 Ostrava, Czech Republic, EU, eva.mazancova@vsb.cz
2 Vítkovice Cylinders a.s., Ruská 24/83, 706 00 Ostrava-Vítkovice, Czech Republic, EU, pavel.kucera@vitkovice.cz
3 VŠB – Technical University of Ostrava, Faculty of Mechanical Engineering, 17. listopadu 15/2172, 708 33 Ostrava – Poruba, Czech Republic, EU, michal.sofer@vsb.cz
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:
764-769
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:
42 views / 11 downloads
Abstract

Work is aimed at tool steel of 55NiCrMoV7 after four different heat treatment types. One part of material was after nitridation, other was quenched using laser, the third part was quenched by laser and subsequently nitrided and one part of steel 55NiCrMoV7 was in basic state after conventional quenching and tempering. Results of surface hardening using micro-hardness of all heat treated modes were compared mutually to find the most effective heat treatment. Micro-hardness was investigated from surface into the 2 mm depth of material. Micro-structure investigation completes the study and includes both purity evaluation and structure using light and SEM microscopy. The given steel type is suitable material for different applications, e.g. for cutting tools.

Keywords: Steel 55NiCrMoV7, nitridation, laser quenching, micro-hardness, microstructure
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