Effect of Severe Shot Peening on Mechanical Properties and Fatigue Resistance of Wire Arc Additive Manufactured AISI 316L

Mikko Hietala; Timo Rautio; Matias Jaskari; Antti Järvenpää

doi:10.4028/p-6kVzON

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HomeSolid State PhenomenaSolid State Phenomena Vol. 349Effect of Severe Shot Peening on Mechanical...

Effect of Severe Shot Peening on Mechanical Properties and Fatigue Resistance of Wire Arc Additive Manufactured AISI 316L

Abstract:

The wire arc additive manufacturing (WAAM) technology has become very popular recently. However, the properties of printed pieces are not yet examined properly. In this paper the effect of severe shot peening (SSP) on mechanical properties of wire arc additive manufactured AISI 316L is investigated. The effect of SSP on the surface hardness of the WAAM 316L is investigated by performing microhardness measurements. Changes to the surface microstructure caused by SSP are evaluated in the EBSD investigation. The effects of SSP on tensile and fatigue strength are investigated experimentally. The EBSD analysis showed that there has been remelting of each printed layer due to the heat input from the next printed layer, and heavy epitaxial grain growth was present in the microstructure. This led to coarse columnar grain structure. Investigation of deformed SSP surface layer indicated that the main deformation type was either conventional dislocation glide or twinning. This meant that no martensite formation was present on the surface. The SSP increased the surface hardness of WAAM printed 316L by 225% and the hardened layer was 0.4 mm thick. The SSP improved the yield strength of WAAM 316L by 34%. The SSP significantly improved WAAM 316L fatigue resistance in both low-cycle and high-cycle regime.

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Periodical:

Solid State Phenomena (Volume 349)

Pages:

15-20

DOI:

https://doi.org/10.4028/p-6kVzON

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Online since:

September 2023

Authors:

Mikko Hietala*, Timo Rautio, Matias Jaskari, Antti Järvenpää

Keywords:

Additive Manufacturing, Fatigue Resistance, Severe Shot Peening, Stainless Steel, Wire Arc Additive Manufacturing

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