Effects of Additive Repair on Microstructure and Mechanical Properties of Laser Additive Manufactured TC4 Titanium

Guang Yang; Yue Ma; Chao Wang; Jiapeng Liu; Lanyun Qin

doi:10.3788/CJL201845.1202002

Chinese Journal of Lasers, Volume. 45, Issue 12, 1202002(2018)

Effects of Additive Repair on Microstructure and Mechanical Properties of Laser Additive Manufactured TC4 Titanium

Guang Yang^1、*, Yue Ma^1、*, Chao Wang¹, Jiapeng Liu², and Lanyun Qin¹

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

² Aero Engine Corporation of China, Sichuan Gas Turbine Establishment, Mianyang, Sichuan 621700, China

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Figures & Tables(11)

Fig. 1. Schematics. (a) Substrate; (b) sampling for tensile samples; (c) size of tensile samples

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Fig. 2. Macrostructures and microstructures of the LDM repaired specimens and WAAM repaired specimens

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Fig. 3. Microstructures of the repaired zones of heat-treated specimens

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Fig. 4. Length-width ratio of the alpha phase in the additive repaired specimen

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Fig. 5. XRD patterns of the repaired zones at different heat treatments

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$Tensile fracture of the repaired specimens$

Fig. 6. Tensile fracture of the repaired specimens

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Table 1. Chemical composition of TC4 powder and wire (mass fraction)%
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Table 1. Chemical composition of TC4 powder and wire (mass fraction)%
Material Al V Fe C O Ti
Powder 5.50-6.80 3.50-4.50 ≤0.30 ≤0.05 ≤0.20 Bal.
Wire 5.50-6.30 3.60-4.40 ≤0.25 ≤0.05 ≤0.03 Bal.

Table 2. Processing parameter of LDM
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Table 2. Processing parameter of LDM
Laser power /W Scanning speed /(mm·s^-1) Power feedingrate /(g·mm^-1) Laserbeam diameter /mm Overlapped rate /% Δz /mm
2400 11 8.0 4.0 55 0.6

Table 3. Processing parameter of WAAM
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Table 3. Processing parameter of WAAM
Weld current /A Travel speed /(mm·s^-1) Wire feedingrate /(m·s^-1) Scanning gap /mm Overlapped rate /% Δz /mm
160 6.0 150 2.5 50 1.2

Table 4. Heat treatment process
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Table 4. Heat treatment process
No. Heat treatment parameter
HT1 600 ℃×4 h,air cooling
HT2 920 ℃(vacuum)×3 h, GQ(argon gasquenching)+540 ℃×4 h,air cooling

Table 5. Room temperature tensile properties of the repaired specimens

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Table 5. Room temperature tensile properties of the repaired specimens

Status of materials	σ_b /MPa	σ_0.2 /MPa	δ /%	Ψ /%
Substrate(as-deposited)	1012	928	10.2	19.45
HT1+LDM	1010.2	964.5	10.9	27.7
HT2+LDM	951.2	900.0	16.2	32.8
HT1+WAAM	1043.7	961.1	9.9	12.8
HT2+WAAM	956.6	842.1	14.5	19.4
HB 5432—1989	≥895	≥825	≥10	≥25

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Guang Yang, Yue Ma, Chao Wang, Jiapeng Liu, Lanyun Qin. Effects of Additive Repair on Microstructure and Mechanical Properties of Laser Additive Manufactured TC4 Titanium[J]. Chinese Journal of Lasers, 2018, 45(12): 1202002

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