Evaluation of Laser Shock Processing Quality of a Superalloy Using a Multi-Criteria Decision Making Methodology

There are many influencing factors and characterization indicators of the laser shock processing (LSP) quality make it difficult to evaluate the processing quality comprehensively and economically. Furthermore, there is no systematic and comprehensive evaluation system for the LSP quality. Therefore, this article combines the coefficient of variation (CV) and Vise Kriterijumska Optimizacija I Kompromisno Resenje (VIKOR) methods to establish an evaluation model. The model was used to evaluate the strengthening quality of the FGH95 superalloy to manufacture helicopter turbine disks after the LSP orthogonal test. The results show that when the laser energy is 8 J, the beam diameter is 5 mm and the number of impacts is 2, the compromise decision indicator value is 0.1806, with the relatively best strengthening effect for the FGH95 superalloy. Under the index weight set in this paper, the comprehensive material properties of the FGH95 superalloy is improved by 3.25 times compared with the unimpacted sample. The CV-VIKOR method has good stability and reliability, enabling efficient, comprehensive, and scientific evaluation and comparison of enhanced quality of different processed samples. This method has an essential reference and guiding significance for reducing the experimental workload, saving experimental costs, and promoting and applying the LSP technology.