Marginalized layer strength improvement through shot peening

© Felizitas Gemetz / Fraunhofer IWM

Shot peening is a widely used surface treatment to improve the static and cyclical strength of metal components. It is utilized in the mechanical stabilization of surface layers and for incorporation of more advantageous residual stresses. In close cooperation with industrial partners, we determine the optimum shot peening parameters in feasibility studies and measure depth-dependent residual stress profiles in our stress measuring laboratories in relation to process parameters. We also determine the hardness, fracture toughness and static and cyclic load bearing capacity of the surface layer. We analyze surface properties such as coverage ratio, roughness and micro-cracking with further technical measurement methods. Fundamental investigations regarding the forming of components by means of shot peening and shot blasting are also integral elements of our area of ​​expertise.

 

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Implementation of feasibility studies

Determination of optimal shot peening parameters

Residual stress experiments

Determination of edge layer strength properties including hardness, dislocation, density, fracture toughness

Determination of applied strength characteristics including static and cyclical load bearing capacity

Low volume production treatments

Experiments concerning shot peen forming

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Examples

© Fraunhofer IWM

Residual stress in ceramic and hard metal after shot blasting

© Fraunhofer IWM

Inhibited crack formation in ceramic and hard chrome after shot peening

© Fraunhofer IWM

Left: Compensation of defects in ceramic bearing rollers through shot blasting Right: Increasing the service life of carbide drills through shot peening

Literature

Pfeiffer, W.; Wenzel, J.; Shot peening of brittle materials – status and outlook; Material Science Forum 638-642 (2010) 799-804 Link

Pfeiffer, W.; Gumbsch, P.; Strengthening of silicon nitride ceramics by shot peening; International journal of materials research 97/12 (2006) 1673-1678 Link

Pfeiffer, W.; Koplin, C.; Reisacher, E.; Wenzel, J.; Residual stresses and strength of hard chromium coatings; Materials Science Forum 681 (2011) 133-138; Link

Pfeiffer, W.; Höpfel, H., Peen forming of ceramics - a new chipless shaping technique, Developments in Strategic Materials and Computational Design V: A Collection of Papers Presented at the 38th International Conference on Advanced Ceramics and Composites 2014, Ceramic engineering and science proceedings 35/8; Kriven, W.M.; Zhu, d.; Moon, K.I.; Hwang, T.; Wang, J.; Lewinsohn C.; Zhou, Y. (Eds.); John Wiley & Sons, Inc., Hoboken, NJ, USA (2015) 229-236 Link

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