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TECHNICAL PAPERS: Gas Turbines: Manufacturing, Materials, and Metallurgy

A Study on Fusion Repair Process for a Precipitation Hardened IN738 Ni-Based Superalloy

[+] Author and Article Information
Dae-Young Kim, Jong-Hyun Hwang, Kwang-Soo Kim, Joong-Geun Youn

Hyundai Industrial Research Inst., Hyundai Heavy Industries Co., Ltd., 1 Cheonha-dong Dong-ku Ulsan, Korea 682-792

J. Eng. Gas Turbines Power 122(3), 457-461 (May 15, 2000) (5 pages) doi:10.1115/1.1287509 History: Received March 09, 1999; Revised May 15, 2000
Copyright © 2000 by ASME
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References

Figures

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Cracking rate in IN738 GTA weldment as a function of welding heat input (Cracking Rate=(Crack Length/Total Weld Length) ×100, percent)
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Features of cracks observed in the IN738 GTA weldment; (a) before and (b) after etching
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Microstructures of IN738 GTA weld near fusion line as a function of welding heat input: (a) 5.5 kJ/cm; (b) 7.6 kJ/cm; and (c) 9.9 kJ/cm
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Dendrite arm spacing in IN738 GTA weld as a function of welding heat input
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Microstructures of IN738 laser weld near fusion line as function of welding heat input: (a) 2 kJ/cm; (b) 4 kJ/cm; (c) 6 kJ/cm; and (d) 8 kJ/cm.
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Dendrite arm spacing in IN738 laser weld as a function of welding heat input
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Hardness distribution in laser weldment as a function of welding heat input
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Cross-sectional microstructures of laser clad layer: (a) lower magnification; (b) higher magnification.
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Hardness distribution in the laser cladding layer

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