TITLE:
Research on the Deformation of Turbine Blades at Machining
AUTHORS:
Masu Yamada, Keiji Sonoya, Takahito Sobayashi, Hiroshi Satoh
KEYWORDS:
Turbine Blade, Machining, Deformation, 12Cr Steel
JOURNAL NAME:
Energy and Power Engineering,
Vol.8 No.1,
January
29,
2016
ABSTRACT: Along with the recent expansion of demand for electricity, the production of steam turbine blades has increased, and various materials forged of 12Cr ferritic heat-resistant types of steel have become widely used for this purpose. Although this material seems to be an excellent choice as heat-resistant steel, it requires a post-correction process for deformation after machining and thus lowers productivity. Therefore, we started basic experimental research, and through a series of tests, we found that 12Cr steel is a sticky material; the residual stresses after machining concentrate in the vicinity of the surface; and this influences the deformation of blades.