Abstract
Shot peening is a manufacturing process commonly used to increase fatigue life in components for the automotive and aircraft industry. In this paper the effect of shot peening is described for a case hardened gear steel. For gears there are three main factors from shot peening that influence fatigue life: residual stresses, microstructure and surface roughness. The paper describes an experimental series where these parameters were measured for common industrial shot peening settings. The aim was to show how several different measurement techniques and results correspond to each other for certain shot peening parameters. The aim was also to gather experimental results that can be used for verification of shot peening simulations. To simplify measurements and decrease variation, flat steel plates were used as targets. Residual stress, full width at half maximum (FWHM), retained austenite, surface roughness/topology, hardness and Barkhausen noise were measured and related to microstructural changes. The mean indentation diameter was measured for individual shots at low coverage of each intensity which was used to determine the average velocity of the media. The mean diameter and hardness of the shot peening media was also determined.
Highlights
Shot peening is a manufacturing process where cold working of the surface is achieved by a propelled stream of spherical shots, often called media
The fatigue performance of gears can be drastically improved by the shot peening operation which is used in several industrial sectors [1]
The results show that the change of Barkhausen noise and the full width at half maximum (FWHM) does depend on the hardness before shot peening and on the specific types of steel
Summary
Shot peening is a manufacturing process where cold working of the surface is achieved by a propelled stream of spherical shots, often called media. The fatigue performance of gears can be drastically improved by the shot peening operation which is used in several industrial sectors [1]. Other areas are inhibiting stress corrosion cracking; close pores in castings to prevent leaking; create surface roughness that improve adhesion of paint; adjust surface profile for enhanced oil retention of seals [5]; creating surface topologies that improve fatigue life of tools, gears and cams [6]. There are three important properties influenced by shot peening when fatigue is considered: residual stresses, work hardening and surface topography [7, 8]. Schulze [9] gives a comprehensive overview of the properties that shot peening influences and how different manufacturing parameters affect the result
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