Plasma transferred arc repair welding of the nickel-base superalloy IN-738LC |
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Authors: | C Y Su C P Chou B C Wu W C Lih |
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Affiliation: | (1) Department of Mechanical Engineering, National Chiao Tung University, Hsinchu, Taiwan, R.O.C.;(2) Industrial Technology Research Institute, Materials Research Laboratories, Hsinchu, Taiwan, R.O.C. |
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Abstract: | Plasma transferred arc welding (PTA) has been considered a promising process to restore worn areas of land-based gas turbine
blades and vanes.
The objective of this investigation was to study the effect of PTA welding on the repairing of IN-738LC superalloy components.
Tensile tests were conducted on specimens welded with various combinations of parameters. Room temperature, 760 °C, and 980
°C were selected as tensile test temperatures. High-temperature phase transformed, during solidification, were identified
by differential thermal analysis (DTA). The weld-pool shapes and microstructures of welded specimens prepared by various welding
parameters were evaluated by optical metallography (OM), a scanning electron microscope (SEM) equipped with energy dispersive
x-ray spectrometer (EDS), and microhardness testing.
Results of this study showed that PTA welded specimens exhibited 96% nominal tensile strength of IN738LC base materials. Specimen
failure was observed predominantly in the base materials instead of in the heat-affected zone (HAZ) for gas tungsten arc weld
(GTAW) repair weldments. IN-738LC is considered susceptible to weld cracking during fusion welding; however, using a low-input
heat repair welding process (PTA), cracking susceptibility could be minimized by the optimized welding parameters. |
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Keywords: | IN-738LC Ni-base alloy plasma welding |
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