Researching | Eutectic Behavior and Wear and Corrosion Resistance Mechanisms of FeCoNiCrNb0.5Mo0.25 High-Entropy Alloy Laser Cladding Layer Microstructure

Journals >Chinese Journal of Lasers >Volume 50 >Issue 4 >Page 0402011 > Article

Chinese Journal of Lasers
Vol. 50, Issue 4, 0402011 (2023)

Eutectic Behavior and Wear and Corrosion Resistance Mechanisms of FeCoNiCrNb_0.5Mo_0.25High-Entropy Alloy Laser Cladding Layer Microstructure

Zijun Zhou, Fulin Jiang^*, Fazhan Yang, Yuling Wang, Yong Yang, Pengfang Song, and Zhaolin Zhong

Author Affiliations

Key Laboratory of Laser Green Intelligent Manufacturing Technology, School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, Shandong, China

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DOI: 10.3788/CJL220498 Cite this Article Set citation alerts

Zijun Zhou, Fulin Jiang, Fazhan Yang, Yuling Wang, Yong Yang, Pengfang Song, Zhaolin Zhong. Eutectic Behavior and Wear and Corrosion Resistance Mechanisms of FeCoNiCrNb_0.5Mo_0.25High-Entropy Alloy Laser Cladding Layer Microstructure[J]. Chinese Journal of Lasers, 2023, 50(4): 0402011 Copy Citation Text

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Failure mode of ship stern shaft[20-21]

Fig. 1. Failure mode of ship stern shaft^[20-21]

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XRD results of FeCoNiCrNb0.5Mo0.25 high-entropy alloy cladding layer prepared at different laser powers

Fig. 2. XRD results of FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer prepared at different laser powers

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Fig. 3. SEM images of FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer prepared at different laser powers

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Fig. 4. Microstructures of FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer prepared at different laser powers

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Fig. 5. Microhardness test results. (a) Microhardness test position; (b) microhardness curve; (c) average microhardness of cladding layer

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Fig. 6. Element distributions of top of FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer prepared at different laser powers. (a) EDS line scanning direction; (b) 1200 W; (c) 1300 W; (d) 1400 W; (e) 1500 W; (f) 1600 W

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Fig. 7. Friction coefficient of substrate sample and FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer samples prepared at different laser powers. (a) Friction coefficient curve; (b) average friction coefficient

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Fig. 8. Low magnification and high magnification images of wear morphology of substrate sample and FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer samples prepared at different laser powers. (a1)(a2) 1200 W; (b1)(b2) 1300 W; (c1)(c2) 1400 W; (d1)(d2) 1500 W; (e1)(e2) 1600 W; (f1)(f2) substrate

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Fig. 9. Element distribution of on wear surface

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Fig. 10. Three dimensional image and contour curve of wear surface of substrate sample and FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer samples prepared at different laser powers. (a) 1200 W; (b) 1300 W; (c) 1400 W; (d) 1500 W; (e) 1600 W; (f) substrate

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Fig. 11. Wear rate of high-entropy alloy cladding layer and substrate

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Fig. 12. Relationship between wear rate of high-entropy alloy cladding layer and H/E^*

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Fig. 13. Polarization curves of FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer and substrate samples in 3.5% NaCl solution

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Fig. 14. Surface corrosion morphologies of substrate sample and FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer samples prepared at different laser powers. (a) 1200 W; (b) 1300 W; (c) 1400 W; (d) 1500 W; (e) 1600 W; (f) substrate

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Fig. 15. Local enlarged feature of corrosion surface of high-entropy alloy cladding layer

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Fig. 16. Relationship between FCC phase content and self corrosion current density

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Element	Mass fraction /%
C	0.42
Cr	1.12
Mn	0.65
Si	0.28
Mo	0.22
Fe	Bal.

Table 1. Chemical composition of 42CrMo steel^[34]

Element	Fe	Co	Ni	Cr	Nb	Mo
Fe		-1	-2	-1	-16	-2
Co	-1		0	-4	-25	-5
Ni	-2	0		-7	-30	-7
Cr	-1	-4	-7		-7	0
Nb	-16	-25	-30	-7		-6
Mo	-2	-5	-7	0	-6

Table 2. Element binary mixing enthalpy^［35］

Power /W	Region inFig.3	Atomic fraction /%
Power /W	Region inFig.3	Fe	Co	Ni	Cr	Nb	Mo
1200	A	37.21	16.65	16.40	17.02	8.89	3.83
	B	32.41	18.93	18.83	16.13	9.52	4.17
	C	38.89	16.24	16.20	15.04	10.34	3.28
1300	A	31.96	19.85	19.90	16.41	8.57	3.34
	B	32.48	19.13	19.96	16.25	8.70	3.50
	C	36.52	16.90	17.81	14.73	10.19	3.86
1400	A	32.23	18.27	20.12	16.92	8.95	3.51
	B	31.13	18.03	20.08	16.68	10.43	3.66
	C	36.43	16.93	18.15	14.08	10.84	3.56
1500	A	37.95	18.33	18.31	14.54	7.64	3.25
	B	37.10	16.76	19.92	15.14	7.77	3.22
	C	44.36	15.51	14.00	13.32	9.42	3.39
1600	A	45.17	15.47	15.77	12.80	7.69	3.11
	B	42.11	16.20	15.71	13.07	9.42	3.49
	C	46.53	14.21	12.97	12.74	10.11	3.44

Table 3. Element content in different regions of FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer prepared at different laser powers

Power /W	Atomic fraction /%
Power /W	Fe	Co	Ni	Cr	Nb	Mo
Nominal composition	21.05	21.05	21.05	21.05	10.52	5.26
1200	33.61	16.70	20.23	16.19	9.63	3.64
1300	33.89	17.68	18.28	16.80	9.49	3.86
1400	33.90	18.65	17.05	16.03	10.58	3.79
1500	39.30	17.73	16.22	15.01	8.16	3.58
1600	42.70	14.96	15.46	13.57	9.52	3.79

Table 4. Each element content in FeCoNiCrNb_0.5Mo_0.25 cladding layer prepared at different laser powers

Power /W	Phase	Atomic fraction /%
Power /W	Phase	Fe	Co	Ni	Cr	Nb	Mo
1200	A	31.89	20.32	23.57	19.27	2.65	2.44
1200	B	28.09	19.90	21.55	17.94	8.23	4.30
1300	A	36.14	18.35	21.57	18.27	3.53	2.14
1300	B	27.32	19.48	15.62	13.18	17.04	7.37
1400	A	39.27	17.13	20.08	16.59	4.74	2.17
1400	B	29.87	17.91	14.23	11.89	19.21	6.90
1500	A	45.56	16.10	17.59	15.03	3.37	2.36
1500	B	33.79	16.68	13.51	11.32	17.91	6.78
1600	A	47.50	16.40	16.50	15.28	1.91	2.40
1600	B	32.90	16.49	12.08	11.32	19.53	7.69

Table 5. Element content of phases of A and B in FeCoNiCrNb_0.5Mo_0.25 high-entropy alloy cladding layer prepared at different laser powers

Power /W	H /GPa	E^*/GPa	H /E^*
1200	8.4534	218.3194	0.0387
1300	8.6006	217.5833	0.0395
1400	8.6966	219.5826	0.0396
1500	7.2948	214.2200	0.0341
1600	7.5393	223.9427	0.0337

Table 6. Microhardness H and effective elastic modulus E^* of high-entropy alloy cladding layer obtained by nanoindentation test

Sample	E_corr /V	i_corr /（A·cm^-2）
1200 W	-0.931	3.506×10^-6
1300 W	-0.618	1.716×10^-6
1400 W	-0.806	4.332×10^-6
1500 W	-0.682	2.643×10^-6
1600 W	-0.643	1.930×10^-6
Substrate	-0.885	9.321×10^-6

Table 7. Electrochemical parameters of FeCoNiCrNb_0.5Mo_0.25high-entropy alloy cladding layer and substrate samples in 3.5% NaCl solution

Power /W	Region in Fig.14	Atomic fraction /%
Power /W	Region in Fig.14	Fe	Co	Ni	Cr	Nb	Mo	O
1200	A	1.28	0.89	0.88	15.03	13.46	0.67	67.79
	B	16.67	14.47	9.90	12.50	15.83	6.22	14.40
	C	27.29	16.45	20.76	17.47	8.12	3.73	6.18
1300	A	0.61	0.30	0.01	18.46	10.10	0.28	70.22
	B	20.75	13.26	12.91	13.73	13.80	5.73	19.82
	C	29.27	16.97	17.43	14.61	10.09	4.35	7.28
1400	A	1.67	0.27	0.40	6.42	7.72	0.25	83.81
	B	18.75	11.18	7.89	9.05	15.45	7.04	30.63
	C	34.42	17.84	19.80	16.43	4.62	2.81	4.09
1500	A	0.52	0.36	0.00	11.26	11.65	0.00	76.21
	B	26.29	13.41	9.77	11.76	16.08	6.96	15.72
	C	34.79	15.47	17.61	14.05	9.73	4.71	3.64
1600	A	3.09	0.70	0.86	12.83	7.01	0.27	75.25
1600	C	37.22	15.41	14.74	14.16	9.16	4.26	5.06

Table 8. Element content in different corrosion areas

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Zijun Zhou, Fulin Jiang, Fazhan Yang, Yuling Wang, Yong Yang, Pengfang Song, Zhaolin Zhong. Eutectic Behavior and Wear and Corrosion Resistance Mechanisms of FeCoNiCrNb_0.5Mo_0.25High-Entropy Alloy Laser Cladding Layer Microstructure[J]. Chinese Journal of Lasers, 2023, 50(4): 0402011

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