Microstructure and Properties of Ni-Cr-Al Basic Alloys Fabricated by Laser Additive Manufacturing

Qun Yu; Cunshan Wang; Chuang Dong

doi:10.3788/CJL202249.1402002

Chinese Journal of Lasers, Volume. 49, Issue 14, 1402002(2022)

Microstructure and Properties of Ni-Cr-Al Basic Alloys Fabricated by Laser Additive Manufacturing

Qun Yu, Cunshan Wang^*, and Chuang Dong

Key Laboratory for Materials Modification by Laser, Ion, and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China

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Figures & Tables(18)

$X-ray diffraction patterns of as-deposited alloys with different compositions$

Fig. 1. X-ray diffraction patterns of as-deposited alloys with different compositions

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Fig. 2. Typical microstructural morphologies of as-deposited alloys with different compositions. (a) Ni_75.0Cr_25.0alloy; (b) Ni_75.0Cr_18.75Al_6.25alloy; (c) Ni_75.0Cr_12.5Al_12.5alloy; (d) Ni_75.0Cr_6.25Al_18.75alloy; (e) Ni_75.0Al_25.0alloy

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$TEM images taken from as-deposited Ni75.0Cr12.5Al12.5 alloy. (a) Bright-field image of γ′-Ni3Al phase; (b) electron diffraction pattern of γ′-Ni3Al phase$

Fig. 3. TEM images taken from as-deposited Ni_75.0Cr_12.5Al_12.5 alloy. (a) Bright-field image of γ′-Ni₃Al phase; (b) electron diffraction pattern of γ′-Ni₃Al phase

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Fig. 4. Influence of Al content on microhardness of as-deposited alloys

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Fig. 5. Compressive stress-strain curves of as-deposited alloys with different compositions

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Fig. 6. Typical compressed surface morphologies of as-deposited alloys with different compositions. (a) Ni_75.0Cr_25.0alloy; (b) Ni_75.0Cr_18.75Al_6.25alloy; (c) Ni_75.0Cr_12.5Al_12.5alloy; (d) Ni_75.0Cr_6.25Al_18.75alloy; (e) Ni_75.0Al_25.0alloy

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Fig. 7. Continuous variable-temperature oxidation kinetic curves of as-deposited alloys with different compositions

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Fig. 8. Oxidized surface morphologies of as-deposited alloys with different compositions. (a) Ni_75.0Cr_25.0 alloy; (b) Ni_75.0Cr_18.75Al_6.25 alloy; (c) Ni_75.0Cr_12.5Al_12.5 alloy; (d) Ni_75.0Cr_6.25Al_18.75 alloy; (e) Ni_75.0Al_25.0 alloy

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$X-ray diffraction patterns of oxidized surfaces of as-deposited alloys with different compositions$

Fig. 9. X-ray diffraction patterns of oxidized surfaces of as-deposited alloys with different compositions

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Fig. 10. Low magnification microstructure of as-deposited alloys. (a)(b)(c) Ni_75.0Cr_25.0 alloy; (d)(e)(f) Ni_75.0Cr_18.75Al_6.25 alloy; (g)(h)(i) Ni_75.0Cr_12.5Al_12.5 alloy; (j)(k)(l) Ni_75.0Cr_6.25Al_18.75 alloy; (m)(n)(o) Ni_75.0Al_25.0 alloy

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Fig. 11. DSC thermal curves of as-deposited alloys with different compositions

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Table 1. Chemical compositions of alloys
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Table 1. Chemical compositions of alloys
Cluster formula Atomic fraction /%
Ni Cr Al
[Cr-Ni₁₂]Cr₃ 75.0 25.00 0
[Al-Ni₁₂]Cr₃ 75.0 18.75 6.25
[Al-Ni₁₂] Al₁Cr₂ 75.0 12.50 12.50
[Al-Ni₁₂] Al₂Cr₁ 75.0 6.25 18.75
[Al -Ni₁₂] Al₃ 75.0 0 25.00

Table 2. Lattice constants and misfits of γ and γ′ phases

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Table 2. Lattice constants and misfits of γ and γ′ phases

Alloy	a_γ /nm	a_γ′ /nm	δ_γ′/γ /%
Ni_75.0Cr_25.0	0.3558±0.0002	-	-
Ni_75.0Cr_18.75Al_6.25	0.3571±0.0003	-	-
Ni_75.0Cr_12.5Al_12.5	0.3564±0.0001	0.3567±0.0002	0.07±0.02
Ni_75.0Cr_6.25Al_18.75	0.3566±0.0002	0.3572±0.0001	0.17±0.03
Ni_75.0Al_25.0	0.3563±0.0002	0.3573±0.0001	0.28±0.03

Table 3. Compositions of typical region from as-deposited alloys with different compositions

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Table 3. Compositions of typical region from as-deposited alloys with different compositions

Alloy	Point No.	Atomic fraction /%
Alloy	Point No.	Ni	Cr	Al
Ni_75.0Cr_25.0	Point 1	74.46	25.54	-
Ni_75.0Cr_25.0	Point 2	26.72	73.28	-
Ni_75.0Cr_18.75Al_6.25	Point 3	74.06	19.50	6.44
Ni_75.0Cr_18.75Al_6.25	Point 4	18.65	80.98	0.37
Ni_75.0Cr_12.5Al_12.5	Point 5	74.26	13.51	12.23
Ni_75.0Cr_12.5Al_12.5	Point 6	14.77	82.52	2.71
Ni_75.0Cr_6.25Al_18.75	Point 7	74.18	6.96	18.86
Ni_75.0Cr_6.25Al_18.75	Point 8	34.27	60.22	5.51
Ni_75.0Al_25.0	Point 9	74.17	-	25.83
Ni_75.0Al_25.0	Point 10	72.79	-	27.21

Table 4. Compressive strength and plasticity of as-deposited alloys with different compositions
View table
Table 4. Compressive strength and plasticity of as-deposited alloys with different compositions
Alloy Yield strength /MPa Compressive strength /MPa
Ni_75.0Cr_25.0 231.9 752.3
Ni_75.0Cr_18.75Al_6.25 288.8 942.9
Ni_75.0Cr_12.5Al_12.5 535.6 1264.8
Ni_75.0Cr_6.25Al_18.75 597.3 1409.6
Ni_75.0Al_25.0 601.5 1561.6

Table 5. Oxidation kinetics data of as-deposited alloys with different compositions

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Table 5. Oxidation kinetics data of as-deposited alloys with different compositions

Alloy	Initial temperature of vigorous oxidation /℃	Total mass gain /(mg·cm^－2)	Mass gain rate /(mg·cm^－2·K^－1)
Ni_75.0Cr_25.0	700.2	0.80	5.43×10^－3
Ni_75.0Cr_18.75Al_6.25	624.6	1.16	6.88×10^－3
Ni_75.0Cr_12.5Al_12.5	720.6	0.68	4.77×10^－3
Ni_75.0Cr_6.25Al_18.75	750-800	0.61	4.04×10^－3
Ni_75.0Al_25.0	800-850	0.53	3.14×10^－3

Table 6. Chemical compositions of typical areas taken from oxidized surfaces of as-deposited alloys with different compositions

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Table 6. Chemical compositions of typical areas taken from oxidized surfaces of as-deposited alloys with different compositions

Alloy	Region	Atomic fraction /%
Alloy	Region	O	Ni	Cr	Al
Ni_75.0Cr_25.0	A	70.30	4.77	24.93	-
Ni_75.0Cr_25.0	B	66.48	8.31	25.21	-
Ni_75.0Cr_18.75Al_6.25	C	14.06	69.28	14.09	2.57
Ni_75.0Cr_18.75Al_6.25	D	67.10	1.03	26.46	5.41
Ni_75.0Cr_12.5Al_12.5	E	7.53	78.59	10.08	3.79
Ni_75.0Cr_12.5Al_12.5	F	68.10	2.29	14.29	15.33
Ni_75.0Cr_6.25Al_18.75	G	9.74	82.79	4.96	2.51
Ni_75.0Cr_6.25Al_18.75	H	65.50	6.64	7.70	20.16
Ni_75.0Al_25.0	I	65.75	5.44	-	28.81

Table 7. Solidification intervals of as-deposited alloys

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Table 7. Solidification intervals of as-deposited alloys

Alloy	Onset melting temperature /℃	Offset melting temperature /℃	Solidification interval /℃
Ni_75.0Cr_25.0	1316.9	1362.4	45.5
Ni_75.0Cr_18.75Al_6.25	1368.5	1400.3	31.8
Ni_75.0Cr_12.5Al_12.5	1355.5	1393.3	37.8
Ni_75.0Cr_6.25Al_18.75	1324.7	1371.5	46.8
Ni_75.0Al_25.0	1323.2	1376.4	53.2

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Qun Yu, Cunshan Wang, Chuang Dong. Microstructure and Properties of Ni-Cr-Al Basic Alloys Fabricated by Laser Additive Manufacturing[J]. Chinese Journal of Lasers, 2022, 49(14): 1402002

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Paper Information

Received: Sep. 28, 2021

Accepted: Nov. 15, 2021

Published Online: Jun. 14, 2022

The Author Email: Wang Cunshan (laser@dlut.edu.cn)

DOI:10.3788/CJL202249.1402002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical compositions of alloys

Table 1. Chemical compositions of alloys

Table 2. Lattice constants and misfits of γ and γ′ phases

Table 2. Lattice constants and misfits of γ and γ′ phases

Table 3. Compositions of typical region from as-deposited alloys with different compositions

Table 3. Compositions of typical region from as-deposited alloys with different compositions

Table 4. Compressive strength and plasticity of as-deposited alloys with different compositions

Table 4. Compressive strength and plasticity of as-deposited alloys with different compositions

Table 5. Oxidation kinetics data of as-deposited alloys with different compositions

Table 5. Oxidation kinetics data of as-deposited alloys with different compositions

Table 6. Chemical compositions of typical areas taken from oxidized surfaces of as-deposited alloys with different compositions

Table 6. Chemical compositions of typical areas taken from oxidized surfaces of as-deposited alloys with different compositions

Table 7. Solidification intervals of as-deposited alloys

Table 7. Solidification intervals of as-deposited alloys