Microstructure and Tensile Properties of Laser Deposition Repair GH738 Superalloy

Bian Hongyou; Zhai Quanxing; Li Ying; Yang Guang; Wang Wei; Wang Wei

doi:10.3788/CJL201744.1002003

Chinese Journal of Lasers, Volume. 44, Issue 10, 1002003(2017)

Microstructure and Tensile Properties of Laser Deposition Repair GH738 Superalloy

Bian Hongyou^1、*, Zhai Quanxing¹, Li Ying², Yang Guang¹, Wang Wei¹, and Wang Wei¹

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¹[in Chinese]

²[in Chinese]

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Figures & Tables(8)

Fig. 1. Schematic of through-groove

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Fig. 2. Microstructures of repair zone. (a) Repair zone interface; (b) heat affected zone; (c) edge of repair zone; (d) center of repair zone

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Fig. 3. Morphology of γ' phase in (a) heat affected zone and (b) substrate

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Fig. 4. (a) SEM morphology of cross section of repaired sample and carbide images in (b) repair zone, (c) heat affected zone and (d) substrate

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$Room temperature tensile fracture morphology of GH738 superalloy repaired by laser deposition. (a) macrograph; (b) microscopic morphology$

Fig. 5. Room temperature tensile fracture morphology of GH738 superalloy repaired by laser deposition. (a) macrograph; (b) microscopic morphology

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Table 1. Chemical composition of GH738 alloy powders
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Table 1. Chemical composition of GH738 alloy powders
Element C P Co Al Fe Mn S Mo
Mass fraction /% 0.06 0.015 13.00 1.40 2.00 0.01 0.015 4.50
Element B Cu Si Cr Ti Zr Ni
Mass fraction /% 0.005 0.10 0.15 20.00 23.00 0.10 Base

Table 2. EDS analysis of different positions in Fig. 4 (mass fraction, %)
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Table 2. EDS analysis of different positions in Fig. 4 (mass fraction, %)
Position C Al Ti Cr Ni Mo Co
1 15.78 0.24 39.23 23.82 6.59 12.16 2.19
2 18.08 0.05 65.75 1.45 1.85 8.49 4.32
3 13.97 0.38 3.56 1.12 52.92 6.09 21.96
4 38.73 0.15 1.59 13.31 31.72 4.32 8.11

Table 3. Room temperature tensile properties of GH738 superalloy repaired by laser deposition
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Table 3. Room temperature tensile properties of GH738 superalloy repaired by laser deposition
Sample number σ_b /MPa σ_0.2 /MPa Elongation /%
1^# 1008.7 672.8 19.0
2^# 1020.2 681.9 18.1
3^# 998.2 663.6 18.0

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Bian Hongyou, Zhai Quanxing, Li Ying, Yang Guang, Wang Wei, Wang Wei. Microstructure and Tensile Properties of Laser Deposition Repair GH738 Superalloy[J]. Chinese Journal of Lasers, 2017, 44(10): 1002003

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