Quantitative Analysis of Nickel-Based Superalloys Based on a Remote LIBS System

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Fig. 1. Optical structure diagram of remote LIBS system

Fig. 2. The best D₁, D₂ at different working distances

Fig. 3. DOF at 5 m working distance

Fig. 4. The Variation of DOF with working distance

Fig. 5. LIBS spectra at different working distances

Fig. 6. Variation of spectral line intensity with working distance

Fig. 7. Focal spot at 2 m (a), 4 m (b), 6 m (c), 8 m (d)

Fig. 8. The relationship between focal spot diameter and working distance

Fig. 9. The standard curves of Ni (a, b), Cr (c, d), Nb (e, f), Mo (g, h), Ti (h, i) and Al (j, k)

Fig. 10. The relationship between LIBS test result error and test times

Number	Ni	Cr	Mo	Nb	Al	Ti
GBW010081	43.89	22.21	4.03	6.79	0.68	1.42
GBW010082	48.60	20.14	3.57	6.06	0.62	1.21
GBW010083	52.47	18.46	3.08	5.15	0.41	0.94
GBW010084	56.67	16.86	2.70	4.51	0.31	0.75
GBW010085	60.00	14.87	2.29	3.85	0.14	0.59
YSBS41503—2012	52.27	18.56	3.28	5.15	0.635	1.03

Table 1. Standard values of GH4169 reference materials

Elements	Methods	w/%	Average/%	RE/%	RSD/%
Ni	LIBS XRF	51.06, 52.67, 52.47, 52.17, 53.23, 50.96 51.07, 51.10, 51.01, 51.16, 51.13, 51.09	52.09 51.09	0.34 2.25	1.74 0.10
Cr	LIBS XRF	17.95, 18.46, 17.78, 18.51, 19.28, 18.36 18.45, 18.52, 18.49, 18.37, 18.35, 18.34	18.39 18.42	0.92 0.76	2.85 0.43
Nb	LIBS XRF	5.46, 4.96, 5.03, 5.24, 5.06, 5.21 5.12, 5.07, 5.15, 5.11, 5.12, 5.10	5.16 5.11	0.21 0.72	3.51 0.49
Mo	LIBS XRF	3.16, 3.34, 3.07, 3.34, 3.41, 3.23 3.27, 3.24, 3.27, 3.24, 3.27, 3.27	3.26 3.26	0.68 0.64	3.90 0.52
Ti	LIBS XRF	1.09, 0.93, 0.96, 1.03, 0.98, 1.02 0.97, 0.99, 1.01, 0.96, 0.96, 1.00	1.00 0.98	2.75 4.68	5.58 2.39
Al	LIBS XRF	0.59, 0.64, 0.58, 0.62, 0.64, 0.63 0.63, 0.59, 0.61, 0.65, 0.58, 0.66	0.62 0.62	2.93 2.39	4.15 5.02

Table 2. Comparison of analysis results between remote LIBS and XRF

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