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.
Highlights
The production of steam turbine blades continues to increase along with the recent expansion of demand for electricity
In terms of the amount of deformation at machining of the turbine blades, foregoing research does not exist at all. Considering this current situation, we started research on the engineering issue: how can this machining deformation be brought as close as possible to zero? In a series of experimental research projects, first, we examined the cutting resistance and investigated how it is influenced by the number of teeth and the depth of the cut made by the tool [4] [5]
We found that 12Cr steel is a sticky material; the residual stresses after machining concentrate in the neighborhood of the surface; and this influences the deformation of blades
Summary
The production of steam turbine blades continues to increase along with the recent expansion of demand for electricity. There is some research on creep strength, etc., for this material as heat-resistant steel [2] [3], there is little research on its characteristics upon machining. In terms of the amount of deformation at machining of the turbine blades, foregoing research does not exist at all. Considering this current situation, we started research on the engineering issue: how can this machining deformation be brought as close as possible to zero? We found that 12Cr steel is a sticky material; the residual stresses after machining concentrate in the neighborhood of the surface; and this influences the deformation of blades
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