Combined method for surface hardening of Р6M5 steelby deposition of N + Ti and N + Cr diffusion coatingsand selective laser post-treatment of substrate
Artykuł w czasopiśmie
MNiSW
40
Lista 2021
| Status: | |
| Warianty tytułu: |
Utwardzanie powierzchni stali P6M5metodą łączącą osadzanie powłok dyfuzyjnych N + Ti i N + Cr oraz obróbkę laserową pod
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| Autorzy: | Paszeczko Mychajło, Kindrachuk Myroslav, Khyzhnyak Viktor, Tisov Oleksandr, Zagrebelniy Volodymyr, Yurchuk Alina |
| Dyscypliny: | |
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| Rok wydania: | 2019 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Numer czasopisma: | 1 |
| Wolumen/Tom: | 227 |
| Strony: | 9 - 13 |
| Bazy: | BazTech | Index Copernicus |
| Efekt badań statutowych | TAK |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| The main aim of current research is to improve wear resistance of tool steels. Chemical heat treatment is a well-known method to do this. Nitriding is a well known method of improving surface hardness and wear resistance. Due to high hardness, low thickness, these coatings often crack and spall out of the substrate. We supposed that varying hardness and composition of the coating will facilitate wear resistance and will help to avoid coating cracking. In this order we propose to use selective laser treatment of cutting edge by laser beam after chemical heat treatment. This locally changes the structure of steel, thus changing the thickness and hardness of coating. A following chemical heat treatment was done — single- (nitriding with laser pre-treatment) and bilayer (nitriding + metallization with laser post-treatment) coatings. Laser post-treatment provides local hardening of steel substrate, with no influence on diffusion layer chemistry. In a work we considered the structure, phase and chemical composition, microhardness of surface areas of steel P6M5 (substitute of PN SW7M, EN HS6–5–2) after chemical heat treatment: nitriding with further titanizing or chromizing and laser post-treatment. For this we used laser installation LATUS-31, radioelectron microscope REMMA 101A. The content of chemical elements was determined by EDS (heavy elements) and WDS (light elements) methods using REMMA 101A built-in facilities. Dry wear test was performed in sliding conditions using block-on-ring test layout. It is proved that combined coatings have better wear resistance versus coatings formed by common nitriding. Laser treatment of substrate prior to chemical heat treatment has a superior effect on the properties of diffusion coatings, increasing their wear resistance in order of two (compared with untreated coatings) Results of analysis indicate that nitrochromized coating on laser post-treated tool steel P6M5 has the best wear resistance under dry sliding friction. |
