Laser welding of oxide dispersion-strengthened alloy MA754
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Conventional arc-welding of MA 754, an oxide dispersion-strengthened (ODS) superalloy, poses two significant problems: agglomeration of dispersoids and weld solidification grain boundaries perpendicular to the rolled direction, both of which reduce the high-temperature creep and stress rupture properties. In the present work, laser welding of MA 754 alloy was conducted to determine the effects of a high energy density source on the microstructure and mechanical properties of a 3.2 mm thick butt joint. Tungsten-inert-gas (TIG) welding was also studied for comparison purpose. X-ray diffraction, optical microscopy and scanning electron microscopy analysis coupled with tensile, hardness and hot corrosion tests were used to evaluate the performance of weldments. Results indicated the absence of dispersoid agglomeration and superior tensile and corrosion properties of laser weldments over arc welds. The properties of laser weldments are comparable to those of wrought MA 754.
KeywordsWelding Laser Welding Corrosion Test Stress Rupture Butt Joint
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