激光选区熔化成形GH5188合金微观组织及性能

doi:10.7527/S1000-6893.2023.28332

Abstract

Abstract:

The effects of laser power， scanning speed， scanning distance and interlayer angle on the forming quality of GH5188 alloy were investigated by Selective Laser Melting （SLM） process. The microstructure and mechanical properties were analyzed. The results show that when the laser power is 300 W， the scanning speed is 800 mm/s， the scanning spacing is 0.08 mm， and the print direction angle between layers is 45°， the internal microstructure of the formed sample is better than the surface， and the quality of the top surface is better than that of the side surface. The microstructure of the alloy is affected by the weld channel and molten pool， and the fine crystals are distributed on the edge of the weld channel. There are fine subcrystals （diameter is 1–2 μm） and long strip precipitation carbide M₂₃C₆/M₆C （about 50 nm long and 10 nm wide） in the grains， and the carbide particles are uniformly dispersed in the matrix. The movement of dislocation was hindered by the subcrystals， and the carbides have pinning effect on dislocation， strengthening the mechanical properties of GH5188 alloy. Under the process parameters， the density of GH5188 alloy increased to 98.75%， the hardness is 296.71 HV， and the tensile strength is 1 048.38 MPa. The hardness and tensile properties of the sample are higher than that of the hot rolled plate， and the elongation is 11.7%， which is lower than that of the hot rolled plate. GH5188 alloy fabricated by SLM has good mechanical properties.

Key words: GH5188 superalloy, SLM, quality, mechanical properties, microstructure

CLC Number:

V252

Nan ZHAO, Duosheng LI, Yin YE, Fencheng LIU, Wugui JIANG. Microstructure and properties of GH5188 alloy fabricated by selective laser melting[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(19): 428332-428332.

Figures/Tables 19

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元素	含量/wt%	元素	含量/wt%
Co	Bal	C	0.07
Ni	23.17	Cu	0.02
Cr	23.13	P	0.005
W	13.58	S	0.003
Fe	1.26	B	0.003
Mn	0.88	O	0.011
Si	0.39	N	0.008
La	0.03

试样号	激光功率/W	扫描速度/（mm·s^-1）	扫描间距/mm	层间转角/（°）
1	200	400	0.08	90
2	200	600	0.08	67
3	200	800	0.08	45
4	240	400	0.10	45
5	240	600	0.10	90
6	240	800	0.10	67
7	260	400	0.12	67
8	260	600	0.12	45
9	260	800	0.12	90

试样号	相对密度/%	顶面粗糙度/μm	侧面粗糙度/μm	顶面硬度/HV	侧面硬度/HV
3	98.75	11.7	15.7	296.7	299.8
5	98.49	15.9	16.4	278.2	293.3
6	97.84	19.2	20.6	284.3	304.6
9	98.28	17.5	19.4	285.4	298.2

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Microstructure and properties of GH5188 alloy fabricated by selective laser melting

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