The Effect of Atmosphere Composition on the Mechanism of Destruction of a Boride Coating on the Surface of a Die Steel during Thermal Cycling

Autor:	N. B. Pugacheva, T. M. Bykova, L. M. Zamaraev
Rok vydání:	2020
Předmět:	Inert Materials science Hydrogen Diffusion chemistry.chemical_element Temperature cycling engineering.material Condensed Matter Physics Microstructure chemistry.chemical_compound Coating chemistry Boride Materials Chemistry engineering Composite material Layer (electronics)
Zdroj:	Physics of Metals and Metallography. 121:590-596
ISSN:	1555-6190 0031-918X
DOI:	10.1134/s0031918x20060113
Popis:	The state of the surface and structure of the diffusion boride coating on the substrate of die steel have been studied after thermal cycling under a constant load of 193 N in hydrogen, nitrogen, and air atmospheres. It is shown that the degradation of boride coating in air occurs due to the development of oxidative processes beneath the coating at the boundary with the steel substrate. In air and nitrogen atmospheres, thermal cycling causes cracking of the boride coating with the formation of quasi-periodic cracks that damage only the boride layer and do not penetrate the steel. Thermal cycling in reducing and inert atmospheres leads to an increase in the values of the microhardness and elastic modulus of the coating due to the diffusion of nitrogen and hydrogen into (Fe,Cr)2B borides.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f6f6baf8860729307e35680eee59ab90 https://doi.org/10.1134/s0031918x20060113 Zobrazit plný text záznamu Full text from SpringerLink