Mechanism of Improving Microstructures of Laser Deposition Repaired GH4169 Alloy by Pulse Current

Jinlan An; Haopu Li; Song Zhou; Yanqing Huang; Bo Gao; Fulong Chen

doi:10.3788/CJL241101

Chinese Journal of Lasers, Volume. 52, Issue 8, 0802104(2025)

Mechanism of Improving Microstructures of Laser Deposition Repaired GH4169 Alloy by Pulse Current

Jinlan An¹, Haopu Li², Song Zhou^2,3、*, Yanqing Huang¹, Bo Gao⁴, and Fulong Chen²

¹Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, Liaoning , China

²School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning , China

³Shenyang Aircraft Design and Research Institute, Shenyang 110135, Liaoning , China

⁴Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning , China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(15)

Fig. 1. Laser deposition equipment and sample size. (a) Schematic diagram of laser deposition fabrication; (b) size of tensile sample

Download full size

Fig. 2. Schematic diagram of laser deposition repair of GH4169 alloy specimen under pulse current treatment

Download full size

Fig. 3. Photographs of laser deposition repaired GH4169 alloys with and without applied pulse current. (a) Without applied pulse current; (b) pulse current with frequency of 10 Hz is applied for 5 min; (c) pulse current with frequency of 10 Hz is applied for 10 min; (d) pulse current with frequency of 10 Hz is applied for 20 min

Download full size

Fig. 4. Laves phase morphologies and equivalent dimensions in repaired area of laser deposition repaired GH4169 alloys with and without applied pulse current

Download full size

$Volume fractions of Laves phases in repaired area of laser deposition repaired GH4169 alloy under different pulse current treatment conditions$

Fig. 5. Volume fractions of Laves phases in repaired area of laser deposition repaired GH4169 alloy under different pulse current treatment conditions

Download full size

Fig. 6. Evolution of Laves phase structure in laser deposition repaired GH4169 alloy under pulse current action

Download full size

Fig. 7. Laves phase morphologies and alloy tensile strengths under different pulse current actions

Download full size

Fig. 8. TEM images and SAED patterns of microstructures of laser deposition repaired GH4169 alloys under different energization time. (a) Pulse current with frequency of 40 Hz is applied for 5 min; (b) pulse current with frequency of 40 Hz is applied for 10 min; (c) pulse current with frequency of 40 Hz is applied for 20 min

Download full size

Fig. 9. Tensile strengths of laser deposition repaired GH4169 alloys under different γ″ phase sizes

Download full size

Table 1. Chemical compositions of base material and GH4169 alloy powder (mass fraction,%)
View table
Table 1. Chemical compositions of base material and GH4169 alloy powder (mass fraction,%)
Element C Mo Ni Fe Cr Al Ti Nb
GH4169 0.04600 2.920 51.96 Bal. 18.16 0.4800 1.040 5.020
Base material 0.03000 3.170 53.00 Bal. 19.20 0.5400 0.6500 5.160

Table 2. Processing parameters of laser deposition repair technique
View table
Table 2. Processing parameters of laser deposition repair technique
Parameter
Laser
power /kW
Scanning speed /
（mm·s^-1）
Laser spot
diameter /mm
Powder feeding
speed /（g·min^-1）
Vertical
increment /mm
Overlap
rate /%
Value 2 10 3 8 0.6 50

Table 3. Measured alloy temperatures during pulse current treatment

View table

Table 3. Measured alloy temperatures during pulse current treatment

Action time /min	Maximum Temperature /℃
Action time /min	Pulse current frequency is 10 Hz	Pulse current frequency is 30 Hz	Pulse current frequency is 40 Hz
5	479‒492	689‒718	741‒766
10	496‒504	722‒727	744‒773
20	517‒522	729‒740	779‒806

Table 4. Commonly used kinetic equations for solid/solid phase reactions controlled by interfacial reactions^[29]
View table
Table 4. Commonly used kinetic equations for solid/solid phase reactions controlled by interfacial reactions^[29]
Laves phase morphology f （X） g （X）
Long strip （1-X）^1/2 2［1-（1-X）^1/2］
Graininess （1-X）^2/3 3［1-（1-X）^1/3］

Table 5. Tensile properties of laser deposition repaired GH4169 alloys under different pulse current treatment conditions
View table
Table 5. Tensile properties of laser deposition repaired GH4169 alloys under different pulse current treatment conditions
Frequency /
Hz
Time /
min
Tensile strength /MPa Yield strength /MPa
Elongation /
%
0 0 641 321 46.9
10 5 704 332 45.5
10 721 328 50.2
20 733 323 53.1
30 5 712 357 47.7
10 762 362 43.6
20 773 348 43.9
40 5 754 354 43.2
10 767 397 40.3
20 791 423 39.3

Table 6. γ″ phase sizes under different energization time
View table
Table 6. γ″ phase sizes under different energization time
Time /min 5 10 20
Average size of γ″ phase /nm 8.250 9.130 15.92

Tools

Get Citation

Copy Citation Text

Jinlan An, Haopu Li, Song Zhou, Yanqing Huang, Bo Gao, Fulong Chen. Mechanism of Improving Microstructures of Laser Deposition Repaired GH4169 Alloy by Pulse Current[J]. Chinese Journal of Lasers, 2025, 52(8): 0802104

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites

Paper Information

Category: Laser Forming Manufacturing

Received: Jul. 31, 2024

Accepted: Oct. 15, 2024

Published Online: Apr. 2, 2025

The Author Email: Song Zhou (zhousong23@163.com)

DOI:10.3788/CJL241101

CSTR:32183.14.CJL241101

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical compositions of base material and GH4169 alloy powder (mass fraction,%)

Table 1. Chemical compositions of base material and GH4169 alloy powder (mass fraction,%)

Table 2. Processing parameters of laser deposition repair technique

Table 2. Processing parameters of laser deposition repair technique

Table 3. Measured alloy temperatures during pulse current treatment

Table 3. Measured alloy temperatures during pulse current treatment

Table 4. Commonly used kinetic equations for solid/solid phase reactions controlled by interfacial reactions[29]

Table 4. Commonly used kinetic equations for solid/solid phase reactions controlled by interfacial reactions[29]

Table 5. Tensile properties of laser deposition repaired GH4169 alloys under different pulse current treatment conditions

Table 5. Tensile properties of laser deposition repaired GH4169 alloys under different pulse current treatment conditions

Table 6. γ″ phase sizes under different energization time

Table 6. γ″ phase sizes under different energization time

Table 4. Commonly used kinetic equations for solid/solid phase reactions controlled by interfacial reactions^[29]

Table 4. Commonly used kinetic equations for solid/solid phase reactions controlled by interfacial reactions^[29]