The contact endurance of NiCrBSi coatings obtained by gas powder laser cladding
- Authors: Savrai R.A.1, Makarov A.V.1, Soboleva N.N.1, Malygina I.Y.1, Osintseva A.L.1
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Affiliations:
- Issue: No 4 (2014)
- Pages: 43-51
- Section: MATERIAL SCIENCE
- URL: https://bakhtiniada.ru/1994-6309/article/view/302228
- ID: 302228
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Abstract
The contact endurance of NiCrBSi coatings obtained by gas powder laser cladding of the powders with various chrome, carbon and boron content (PG-SR2, wt. %: 14.8 Сr – 2.1 В – 0.48 С; PG-10N-01, wt. %: 18.2 Cr – 3.3 В – 0.92 С) and TiC addition (PG-SR2 + 25 wt. % TiC) is investigated. The average microhardness was 520 HV for PG-SR coating, 720 HV for PG-10N-01 coating and 770 HV for TiC – PG-SR2 coating. Tests on the contact fatigue are carried out using a servohydraulic testing machine (Instron 8801) circuit-wise pulsating non-impact contact «ball-plane» scheme with the load variation during a cycle according to a sinusoidal law. The maximum resistance to a contact impact during repetitive elastic-plastic deformation on mechanical non-impact contact loading is determined for PG-10N-01 coating with increased chrome, carbon and boron content in comparison with PG-SP2, the minimal one was for composite PG-SR2 coating with addition 25 wt. % TiC particles. The examination of the contact spots using scanning electron microscopy shows that the main fracture mechanism of every investigated coating under contact fatigue loading is cracking.
About the authors
R. A. Savrai
Email: ras@imach.uran.ru
Ph.D. (Engineering), Institute of Engineering Science Ural Branch of Russian Academy of Sciences, e-mail: ras@imach.uran.ru
A. V. Makarov
Email: avm@imp.uran.ru
D.Sc. (Engineering), Senior Researcher, Institute of Engineering Science Ural Branch of Russian Academy of Sciences, e-mail: avm@imp.uran.ru
N. N. Soboleva
Email: natashasoboleva@list.ru
Junior Researcher, Institute of Engineering Science Ural Branch of Russian Academy of Sciences, e-mail: natashasoboleva@list.ru
I. Y. Malygina
Email: malygina@imach.uran.ru
Ph.D. (Engineering), Institute of Engineering Science Ural Branch of Russian Academy of Sciences, e-mail: malygina@imach.uran.ru
A. L. Osintseva
Email: osintseva@imach.uran.ru
Ph.D. (Engineering), Senior Researcher, Institute of Engineering Science Ural Branch of Russian Academy of Sciences, e-mail: osintseva@imach.uran.ru
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