The FGH95 superalloy used for turbine disk manufacturing was strengthened by the oblique laser shock processing (OLSP). The laser energy, beam diameter, and number of impacts were selected as the test factors, and the three-factor three-level oblique laser shock processing orthogonal test was carried out. Based on the analysis of variance and range of the surface residual stress, microhardness, roughness, tensile strength, and yield strength of FGH95 superalloy after LSP, the factor level combination of relative best comprehensive performance was obtained. The results showed that, within the 10% confidence level, the order of influencing factors with significant difference is: laser energy > number of impacts > beam diameter. Compared with the unimpacted sample, the microhardness of the material surface was increased by about 25% after OLSP. With the increase of laser energy, the dimple distribution of the sample was more uniform, smaller in size, and shallower in depth. However, the thickness of the affected layer was very low, and there was no significant effect on the tensile properties. In general, and under the test conditions selected in this study, the combination of 8 Joule laser energy, 3 mm beam diameter, and three impacts can be selected to obtain the best comprehensive performance. The results of this paper provide a reference for the OLSP of the FGH95 superalloy turbine disk and other aero engine parts.
As a metal surface strengthening technology, oblique laser shock
peening uses the force effect of pulsed laser beams to significantly
improve the mechanical properties of materials and prolong service
life. However, the processing of metal parts still requires a high
cost for testing the quality of the finished product. At present,
there is no systematic and complete measurement method or evaluation
system for the finished products of oblique laser shock peening
technology. In this paper, a principal component analysis method and a
comprehensive index method are organically combined to construct a
method for evaluating the effect of oblique laser shock peening of
FGH95 superalloy turbine disks. We measured 10 real data of FGH95
superalloy specimens after oblique laser shock peening by using the
orthogonal test method and verified the data. Based on the evaluation
results, we put forward a series of suggestions to improve the quality
of oblique laser shock peening of FGH95 high-temperature turbine
disks, providing a certain reference and guidance for processing FGH95
superalloy turbine disks.
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