Relative Density of GH4169 Superalloy Prepared by Selective Laser Melting

Fig. 5. Melt pool morphology of GH4169 samples prepared by different process parameters. (a) No. 1 parameter; (b) No. 2 parameter; (c) No. 3 parameter

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Fig. 6. Microstructure morphology of GH4169 samples prepared by different process parameters. (a) No. 1 parameter; (b) No. 2 parameter; (c) No. 3 parameter

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Table 1. Designed composition and tested composition of GH4169 powder
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Table 1. Designed composition and tested composition of GH4169 powder
Element C Cr Ni Co Mo Al Ti Nb Fe
Designed mass fraction /% 0.02-0.06 17-21 50-55 ≤1.0 2.8-3.3 0.3-0.7 0.75-1.15 5.0-5.5 Bal.
Tested mass fraction /% 0.036 18.7 53.83 <0.1 3.23 0.44 0.93 5.19 Bal.

Table 2. Energy input density model proposed by other researchers

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Table 2. Energy input density model proposed by other researchers

No.	First author	Model	Physical significance	Ref.
1	Morgan	$\begin{matrix} φ_{1} = \frac{4 P}{πνs} \end{matrix}$	Energy input of one unit area in one unit time	[17]
2	Simchi	$\begin{matrix} φ_{2} = \frac{P}{νd h} \end{matrix}$	Energy input of one unit volume in one unit time	[18]
3	Simchi	$\begin{matrix} φ_{3} = \frac{P}{νs h} \end{matrix}$	Energy input of one unit volume in one unit time	[19]
4	Yadroitsev	$\begin{matrix} φ_{4} = \frac{P}{ν} \end{matrix}$	Energy input in one unit time	[20]

Table 3. Table of energy input density

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Table 3. Table of energy input density

Scanningspeed /(m·s^-1)	Energy input density /(W·s·m^-1)
Scanningspeed /(m·s^-1)	200 W	230 W	260 W	290 W	320 W	350 W
0.6	333.3333	383.3333	433.3333	483.3333	533.3333	583.3333
0.9	222.2222	255.5556	288.8889	322.2222	355.5556	388.8889
1.2	166.6667	191.6667	216.6667	241.6667	266.6667	291.6667
1.5	133.3333	153.3333	173.3333	193.3333	213.3333	233.3333
1.8	111.1111	127.7778	144.4444	161.1111	177.7778	194.4444
2.1	95.2381	109.5238	123.8095	138.0952	152.3810	166.6667

Table 4. Sample relative density prepared by various laser powers and scanning speeds

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Table 4. Sample relative density prepared by various laser powers and scanning speeds

Scanning speed /(m·s^-1)	Relative density /%
Scanning speed /(m·s^-1)	200 W	230 W	260 W	290 W	320 W	350 W
0.6	97.70	96.70	98.10	98.20	96.10	97.50
0.9	98.20	96.80	97.40	98.30	98.40	97.30
1.2	98.90	97.80	99.60	98.40	97.00	98.30
1.5	97.90	98.50	99.10	99.70	97.70	98.40
1.8	92.90	96.20	98.20	99.50	99.00	97.90
2.1	89.80	92.70	95.60	96.80	97.40	98.20

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Guohui Zhang, Shaoqing Guo, Shuai Huang, Biao Zhou, Taiqi Yan, Bingqing Chen, Xuejun Zhang. Relative Density of GH4169 Superalloy Prepared by Selective Laser Melting[J]. Laser & Optoelectronics Progress, 2020, 57(3): 031404

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