Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/5255

Title

Residual stress measurements in laser clad repaired low pressure turbine blades for the power industry

Author(s)

Bendeich, Philip;  Alam, Nazmul;  Brandt, Milan;  Carr, David G.;  Short, Ken;  Blevins, Richard;  Curfs, Caroline;  Kirstein, Oliver;  Atkinson, Gregory;  Holden, Thomas M.;  Rogge, Ronald B.

Abstract

Low pressure turbine blades in power stations suffer from leading edge erosion damage due to water impingement. In an effort to extend the life of these blades, repair of the eroded regions has been proposed using laser cladding with Stellite material. However, the addition of Stellite results in residual stresses being generated in the parent metal due to contraction during cooling and differences in thermal expansion between the two materials. In this work test coupons and laser clad blades were examined for residual stresses using both the L3 diffractometer at the NRU reactor, Chalk River, Canada and the TASS strain scanner at ANSTO's HIFAR reactor, Lucas Heights, Australia. In addition XRD results were used to measure residual stresses on the surface of the blade to complement the neutron measurements. An FEA model of a simplified weld was used to explain some of the results.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Industrial Research Institute Swinburne

Source

Materials Science and Engineering A : Structural Materials: Properties, Microstructures and Processing, Vol. 437, no. 1 (2006), p. 70-74

Publication year

2006

Keyword(s)

FEA;  Laser cladding;  Low pressure turbine blade;  Post-weld heat treatment;  Residual stress

Publisher

Elsevier SA

Format

70-74

ISSN

0921-5093

Publisher URL

http://dx.doi.org/10.1016/j.msea.2006.04.065

Copyright

Crown Copyright © 2006.

Peer reviewed