Oblique laser shock peening effect of the FGH95 superalloy with a PCA and comprehensive index

Chaohui Lin; Chaohui Lin; Yang Tang; Yang Tang; Longwei Yu; Hebin Wu; Hebin Wu; Chengpeng Xia; Qi Zhang

doi:10.1364/AO.450877

Applied Optics
Vol. 61,
Issue 10,
pp. 2690-2696
(2022)
•https://doi.org/10.1364/AO.450877

Oblique laser shock peening effect of the FGH95 superalloy with a PCA and comprehensive index

Chaohui Lin, Yang Tang, Longwei Yu, Hebin Wu, Chengpeng Xia, and Qi Zhang

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Chaohui Lin, Yang Tang, Longwei Yu, Hebin Wu, Chengpeng Xia, and Qi Zhang, "Oblique laser shock peening effect of the FGH95 superalloy with a PCA and comprehensive index," Appl. Opt. 61, 2690-2696 (2022)

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Abstract

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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Data availability

The datasets generated and/or analyzed during the current study are available from the corresponding author upon reasonable request.

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Level-I Index	Level-II Index	Level-III Index	Variable Codes
Strengthening effect	Surface property	Compressive residual stress (MPa)	$X_{1}$
		Surface roughness (µm)	$X_{2}$
		Microhardness (HV)	$X_{3}$
	Tensile property	Tensile strength (MPa)	$X_{4}$
		Yield strength (MPa)	$X_{5}$
		Elongation (%)	$X_{6}$
	Microstructure	Average grain size (µm)	$X_{7}$
	Deformation	Arc height (mm)	$X_{8}$
		Mean curvature ( $1 \times 10^{- 4} m m^{- 1}$ )	$X_{9}$

	Compressive Residual Stress (MPa)	Surface Roughness (µm)	Microhardness (HV)	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Average Grain Size (µm)	Arc Height (mm)	Mean Curvature ( $10^{- 4} m m^{- 1}$ )
1	−517.42	13.910	502.15	1697.0	1015.0	35.650	11.300	0.66000	4.5300
2	−520.49	13.960	512.77	1714.0	1093.0	35.380	10.800	0.84000	5.5200
3	−515.54	13.550	498.61	1685.0	1188.0	35.790	11.500	1.0600	5.9200
4	−526.73	14.310	525.87	1701.0	1005.0	35.380	9.9000	1.0800	6.0900
5	−534.48	15.160	522.42	1704.0	1075.0	35.160	10.100	1.5500	9.1800
6	−497.56	11.160	494.19	1693.0	1007.0	35.900	12.500	0.56000	3.6500
7	−558.35	17.950	550.15	1821.0	1148.0	34.960	8.5000	1.5000	8.6300
8	−527.67	15.460	518.58	1736.0	976.00	36.410	10.300	0.51000	3.2300
9	−530.22	15.640	531.55	1748.0	1068.0	35.380	9.4000	0.95000	5.7800
10	−465.67	9.9400	441.26	1587.0	971.00	36.610	15.000	0.12000	1.1100

	Negative Indices					Positive Indices
	Compressive Residual Stress	Surface Roughness	Elongation	Mean Curvature	Arc Height	Microhardness	Tensile Strength	Yield Strength	Average Grain Size
1	0.558	0.504	0.582	0.576	0.622	0.559	0.470	0.203	0.431
2	0.591	0.498	0.745	0.454	0.497	0.657	0.543	0.562	0.354
3	0.538	0.549	0.497	0.404	0.343	0.527	0.419	1.00	0.462
4	0.659	0.454	0.745	0.383	0.329	0.777	0.487	0.157	0.215
5	0.742	0.348	0.879	0.010	0.010	0.745	0.500	0.479	0.246
6	0.344	0.848	0.430	0.685	0.692	0.486	0.453	0.166	0.615
7	1.00	0.010	1.00	0.068	0.035	1.00	1.00	0.816	0.010
8	0.669	0.311	0.121	0.737	0.727	0.710	0.637	0.023	0.277
9	0.696	0.288	0.745	0.421	0.420	0.829	0.688	0.447	0.138
10	0	1	0.0100	1.00	1.00	0	0.0100	0.0100	1.00

Index	Initial	Extract
Compressive residual stress	1.00	0.987
Surface roughness	1.00	0.935
Elongation	1.00	0.846
Mean curvature	1.00	0.943
Arc height	1.00	0.940
Microhardness	1.00	0.980
Tensile strength	1.00	0.903
Yield strength	1.00	0.775
Average grain size	1.00	0.982

Index	X7	X8	X9
X1	0.926	0.511	−0.980
X2	−0.0911	−0.469	0.954
X3	0.678	0.599	−0.774
X4	−0.663	−0.674	0.786
X5	−0.655	−0.690	0.783
X6	0.934	0.427	−0.992
X7	1.00	0.457	−0.914
X8	0.457	1.00	−0.435
X9	−0.914	−0.436	1.00

	Initial Eigenvalue			Sum of Squares
Composition	Sum	Variance (%)	Multiplicative (%)	Sum	Variance (%)	Multiplicative (%)
Compressive residual stress	7.271	80.78	80.78	7.271	80.78	80.78
Surface roughness	1.020	11.33	92.12	1.020	11.33	92.12
Elongation	0.4280	4.758	96.87
Mean curvature	0.1650	1.829	98.70
Arc height	0.0560	0.6210	99.32
Microhardness	0.0500	0.5530	99.88
Tensile strength	0.0080	0.0930	99.97
Yield strength	0.0030	0.0310	99.99
Average grain size	5.80E-05	0.0010	100.0

	Composition
	1	2
Compressive residual stress	0.976	0.187
Surface roughness	−0.928	−0.270
Elongation	0.880	−0.268
Mean curvature	−0.915	0.325
Arc height	−0.910	0.334
Microhardness	0.954	0.263
Tensile strength	0.893	0.324
Yield strength	0.628	−0.617
Average grain size	−0.956	−0.262

Index	F1	F2	$E_i j$
Compressive residual stress	0.134	0.183	0.104
Surface roughness	0.128	0.265	0.110
Elongation	0.121	0.262	0.106
Mean curvature	0.126	0.318	0.114
Arc height	0.125	0.327	0.114
Microhardness	0.131	0.257	0.113
Tensile strength	0.123	0.318	0.112
Yield strength	0.086	0.605	0.115
Average grain size	0.131	0.257	0.112

Abstract

Data availability

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Figures (2)

Tables (8)

Equations (9)

Applied Optics