Roller Pressing or Shot Peening of Fir-Tree Root of LPT Blades of 500 MW Steam Turbine

  1. Prof. Dr.-Ing Lothar Wagner Chairman of ICSP8
  1. Mahesh C. Sharma

Published Online: 7 FEB 2006

DOI: 10.1002/3527606580.ch63

Shot Peening

Shot Peening

How to Cite

Sharma, M. C. (2003) Roller Pressing or Shot Peening of Fir-Tree Root of LPT Blades of 500 MW Steam Turbine, in Shot Peening (ed L. Wagner), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606580.ch63

Editor Information

  1. TU Clausthal, Institut für Werkstoffkunde und Werkstofftechnik, Agricolastr. 6, D-38678 Clausthal-Zellerfeld, Germany

Author Information

  1. Maulana Azad College of Technology, Bhopal, India

Publication History

  1. Published Online: 7 FEB 2006
  2. Published Print: 12 MAY 2003

ISBN Information

Print ISBN: 9783527305377

Online ISBN: 9783527606580

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Keywords:

  • roller pressing;
  • shot peening

Summary

In the present investigation surface roughness and residual stress data obtained with different peening parameters were reported. It was observed that pressure peening with 10 mm convergent divergent nozzle, 1 to 1.2 mm cast steel shots, at 0.32 A peening intensity, 3 kg/cm2 tank pressure 12” stand off, 125 to 150 % coverage gave residual stress value −418 MPa at 0.25 mm depth in 12 % chrome steel test pieces. The surface roughness too was with in required range (Ra = 2.80 µm). Residual stress on an actual blade profile cut section was also verified. Thus roll pressing can be replaced by shot peening.