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Physics of Metals and Metallography
Published in: Physics of Metals and Metallography 6/2020

01-06-2020 | STRENGTH AND PLASTICITY

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

Authors: N. B. Pugacheva, T. M. Bykova, L. M. Zamaraev

Published in: Physics of Metals and Metallography | Issue 6/2020

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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.
previous article Comparison of Contributions of the Mechanisms of the Superplastic Deformation of Binary and Multicomponent Brasses
next article The Effect of Multidirectional Forging on the Deformation and Microstructure of the Al–Mg Alloy

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Metadata
Title
The Effect of Atmosphere Composition on the Mechanism of Destruction of a Boride Coating on the Surface of a Die Steel during Thermal Cycling
Authors
N. B. Pugacheva
T. M. Bykova
L. M. Zamaraev
Publication date
01-06-2020
Publisher
Pleiades Publishing
Published in
Physics of Metals and Metallography / Issue 6/2020
Print ISSN: 0031-918X
Electronic ISSN: 1555-6190
DOI
https://doi.org/10.1134/S0031918X20060113

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