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

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Abstract

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.

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Funding

This work was performed using the equipment of Center for Collective Use Plastometriya at the Institute of Engineering Science, Ural Branch, Russian Academy of Sciences, in accordance with State assignment under topic no. AAAA-A18-118020790145-0.

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Correspondence to T. M. Bykova.

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Translated by O. Kadkin

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Pugacheva, N.B., Bykova, T.M. & Zamaraev, L.M. The Effect of Atmosphere Composition on the Mechanism of Destruction of a Boride Coating on the Surface of a Die Steel during Thermal Cycling. Phys. Metals Metallogr. 121, 590–596 (2020). https://doi.org/10.1134/S0031918X20060113

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  • DOI: https://doi.org/10.1134/S0031918X20060113

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