University of Oulu

Gundgire, T., Jokiaho, T., Santa-aho, S., Rautio, T., Järvenpää, A., & Vippola, M. (2022). Comparative study of additively manufactured and reference 316 L stainless steel samples – Effect of severe shot peening on microstructure and residual stresses. Materials Characterization, 191, 112162.

Comparative study of additively manufactured and reference 316 L stainless steel samples : effect of severe shot peening on microstructure and residual stresses

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Author: Gundgire, Tejas1; Jokiaho, Tuomas1; Santa-aho, Suvi1;
Organizations: 1Tampere University, Materials Science and Environmental Engineering, P.O 589, 33100 Tampere, Finland
2Kerttu Saalasti Institute, University of Oulu, Pajatie 5, 85500 Nivala, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 6.9 MB)
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Language: English
Published: Elsevier, 2022
Publish Date: 2023-02-03


The as-built selective laser melted (SLM) austenitic stainless steel 316 L components are characterized by presence of quality related concerns such as tensile residual stresses, poor surface finish, etc. These issues may prove to be detrimental during the actual usage of components and could result in poor mechanical performance. Therefore, it is important to perform the apt post processing such as heat treatment and shot peening to tailor such problems and facilitate improved mechanical performance. In the present work, additively manufactured (AM) 316 L samples were subjected to shot peening with different parameters including the severe shot peening (SSP) procedure. The identical shot peening protocol was also applied to reference samples to evaluate the comparable response. Both the shot peened reference and AM samples were studied for residual stresses, surface topography, microhardness, and the corresponding microstructure. The results indicated, that SSP induced higher values of compressive residual stresses deeper into the samples. This was accompanied by reduced surface roughness, increased grain refinement depth, and higher microhardness near the surface. The SSP resulted in transformation of original austenite to martensite near the surface in the reference samples.

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Series: Materials characterization
ISSN: 1044-5803
ISSN-E: 1873-4189
ISSN-L: 1044-5803
Volume: 191
Article number: 112162
DOI: 10.1016/j.matchar.2022.112162
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This research was funded by Association of Finnish Steel and Metal Producers, grant numbers 750 and 1475. It was also supported by European Union (European Regional Development Fund, Council of Oulu Region) for the “Hybridi” grant number A73071 and “M3D” grant number A77901.
Copyright information: © 2022 The Authors. This is an open access article under the CC BY license (