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Characterization of Plastic Deformation Induced by Shot-Peening in a Ni-Base Superalloy
University of Cambridge, England.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Rolls Royce PLC, England.
University of Cambridge, England.
2014 (English)In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 66, no 12, 2502-2515 p.Article in journal (Refereed) Published
Abstract [en]

The shot-peening process is currently employed in most industries to improve the longevity of components by inhibiting crack initiation as well as crack growth at the surface. The protective effect of shot peening has been mainly attributed to compressive stresses within the deformed layer. Intensive research has been carried out to quantify the near-surface residual stresses on entry into service and evolution throughout life. In nickel-base superalloys, the focus of research on the effects of shot-peening has performed using x-rays from either laboratory or synchrotron-based sources. However, this approach cannot evaluate in detail the deformation mechanisms nor the role of the gamma precipitates in a nickel-base superalloy; the latter is responsible for its unique properties. Our study uses a complementary range of techniques to investigate in detail the microstructure and deformation mechanisms associated with shot-peening in a coarse-grained nickel-based superalloy strengthened with coherent gamma precipitates. These include scanning electron microscopy and transmission electron microscopy, nanoindentation and micropillar compression. Accurate mapping of the dislocation structure produced throughout the deformed layers have been performed. Using an unconventional specimen preparation technique, it provides the basis for a more complete interpretation of how shot-peening inhibits fatigue cracking.

Place, publisher, year, edition, pages
Springer Verlag (Germany) , 2014. Vol. 66, no 12, 2502-2515 p.
National Category
Mechanical Engineering
URN: urn:nbn:se:liu:diva-113049DOI: 10.1007/s11837-014-1184-8ISI: 000345397200017OAI: diva2:778347

Funding Agencies|EPSRC [EP/H500375/1, EP/H022309]; Rolls-Royce plc. [EP/H500375/1, EP/H022309]; TSB project SILOET TP [AB266C/4]

Available from: 2015-01-09 Created: 2015-01-08 Last updated: 2015-01-09

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Stekovic, Svjetlana
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