摘要
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.
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.
作者
Masu Yamada
Keiji Sonoya
Takahito Sobayashi
Hiroshi Satoh
Masu Yamada;Keiji Sonoya;Takahito Sobayashi;Hiroshi Satoh(TBM Corporation, Nagano, Japan;Department of Mechanical Systems, Yamanashi University, Kofu, Japan;Nichia Tanko Co. Ltd., Tomioka, Japan;Oridea Inc., Mishima, Japan)
