Microstructure and Residual Stress in Shot Peened and Superfinished Gearwheel Teeth
Author: M. Bandini, M. D’Incau, P. Scardi
Source: ICSP-13
Doc ID: 2017063
Year of Publication: 2017
Abstract:
Introduction:
Shot peening is acknowledged as one of the most effective treatments to increase fatigue resistance of mechanical components. A jet stream of spherical shots strikes the surface of a metallic component. The surface layers are plastically deformed whilst the underlying ones remain elastic. The main effects are
the creation of a compressive residual stress field and a microstructure modification in the surface layers of the material. A side effect is usually an increase of the surface roughness. In automotive field, superfinishing is a well-known mechanical treatment applied in order to reduce surface roughness of gearwheel teeth contact surface. In this field, surface roughness is commonly
considered a key factor for lubrication, contact fatigue performance and transmission efficiency. As a rough idea, during superfinishing, workpieces are put in a vibratory tumble in conjunction with abrasive media and soap or chemical accelerant. Superfinishing is commonly considered as not effective on preexisting compressive residual stresses.
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