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Experimental Analysis of Residual Stresses in Samples of Austenitic Stainless Steel Welded on Martensitic Stainless Steel Used for Kaplan Blades Repairs

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Author(s): Vasile Cojocaru | Viorel Constantin Campian | Calin-Octavian Miclosina

Journal: Analele Universităţii Eftimie Murgu Reşiţa. Fascicula de Inginerie
ISSN 1453-7397

Volume: XVIII;
Issue: 1;
Start page: 161;
Date: 2011;
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Keywords: Residual stresses | austenitic stainless steel | martensitic stainless steel | cavitation erosion | Kaplan turbine

ABSTRACT
Residual stresses occur in materials as a result of mechanical processes: welding, machining, grinding etc. If residual stresses reach high values they can accelerate the occurrence of cracks and erosion of material. An experimental research was made in order to study the occurrence of residual stresses in the repaired areas of hydraulic turbine components damaged by cavitation erosion. An austenitic stainless steel was welded in various layer thicknesses on a martensitic stainless steel base. The residual stresses were determined using the hole drilling strain gage method.
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