A Supplementary Mechanical Treatment to Strengthen Surfaces After Machining

A surface treatment is presented in which a hard metal tool insert with rounded edges is pressed on a machined surface at low speed and optimized pressure. This treatment can be executed on the same lathe used previously for machining. The effects on surface topography and surface layer properties (...

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Bibliographic Details
Published in:Materialwissenschaft und Werkstofftechnik 1991-10, Vol.22 (10), p.381-389
Main Authors: Wiesner, C, Ilschner, B
Format: Article
Language:ger
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Summary:A surface treatment is presented in which a hard metal tool insert with rounded edges is pressed on a machined surface at low speed and optimized pressure. This treatment can be executed on the same lathe used previously for machining. The effects on surface topography and surface layer properties (microhardness and X-ray peak halfwidth profiles, as well as residual stresses) have been quantitatively determined. In Cu specimens, the surface treatment leads to compressive residual stresses and to strong surface layer deformation and, thus, to an increase of near- surface hardness. The effect decreases the amplitude of plastic deformation in the surface layer during fatigue and results in a 25% increase of the fatigue strength at 10 exp 7 c. In Al-2024 T6, the surface treatment causes high compressive residual stresses, an increase in superficial hardness and smoothing of the surface topography. This results in an improvement of the fatigue strength at 10 exp 7 c of 48%.
ISSN:0933-5137
DOI:10.1002/mawe.19910221006