Abstract
In the work we demonstrate the possibility of forming thin surface and near-surface layers with submicrocrystalline structure under ultrasonic plastic deformation of machined steels. Formation of fine gradient textures up to nanocrystalline allows significant changing physical and mechanical properties of machined steels. Ensures improvement of microstructure, produces internal compressive strains which improves the cyclic strength of machine parts.
Highlights
In recent times attention of Russian and foreign scientists is attracted to the problem of structural materials modification due to external high-energy impacts [1]
One of the methods of high energy impact upon metal surface is ultrasonic metal deformation when the surface of the part after machining is impacted by a tool oscillating with ultrasonic frequency [1,2,3, 7,8,9,10,11]
In the given work we study the influence of ultrasonic plastic deformation upon structure and properties of surface layers of low-carbon, medium-carbon and high-carbon steels of ferrite, ferritepearlite and pearlite classes
Summary
In recent times attention of Russian and foreign scientists is attracted to the problem of structural materials modification due to external high-energy impacts [1]. A characteristic feature of such technologies is insignificant time of impact upon the processed surface and high energy density (dozens and hundreds of J/cm2) of input energy. One of the methods of high energy impact upon metal surface is ultrasonic metal deformation (ultrasonic treatment) when the surface of the part after machining is impacted by a tool (a ball) oscillating with ultrasonic frequency [1,2,3, 7,8,9,10,11]. The oscillating system of the ultrasonic device for strengthening metallic parts is loaded with static force determining the hold-down pressure. The parts to undergo ultrasonic treatment can be of varying forms: round, flat and profiled [4,5,6, 10, 11]
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