Residual stresses in electron-beam coatings with a nitrogen-austenite matrix and structural mechanisms of their relaxation

The structure, distribution of elastic microdeformations related to the effect of residual stresses of the 1st and 2nd kind in nitrogen austenite coatings prepared by electron-beam overlaying and the mechanisms of relaxation of residual stresses in the substrate-coating system have been investigated...

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Bibliographic Details
Published in:Physics of metals and metallography 2011-11, Vol.112 (5), p.495-502
Main Authors: Narkevich, N. A., Ivanova, E. A., Mironov, Yu. P., Smirnov, A. I., Durakov, V. G., Tagil’tseva, D. N.
Format: Article
Language:English
Subjects:
Analysis
Chemistry and Materials Science
Coatings
Coatings industry
Density
Dislocations
Materials Science
Metallic Materials
Overlaying
Residual stress
Strength and Plasticity
Stress concentration
Stress relaxation
Transformations
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Summary:The structure, distribution of elastic microdeformations related to the effect of residual stresses of the 1st and 2nd kind in nitrogen austenite coatings prepared by electron-beam overlaying and the mechanisms of relaxation of residual stresses in the substrate-coating system have been investigated. The state of stress is characterized by a change in sense over the coating thickness. An analysis of experimental data shows that the relaxation of residual stresses results in the formation of a structure with an enhanced density of dislocations. The main mechanism of relaxation of residual stresses in overlaid coatings is microtwinning and γ → ɛ transformation.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X11050267