Improved Resistance to Laser Weld Heat-Affected Zone Microfissuring in a Newly Developed Superalloy HAYNES 282
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COMPONENTS of aero and land-based gas turbine engines are manufactured from nickel-base superalloys because of their unique high strength at elevated temperatures and resistance to hot corrosion in severe hostile environments. In order to meet the ever increasing demand for better engine performance, it has become necessary for designers to increase turbine inlet temperatures. HAYNES 282* is a new c¢ precipitation-
such as WASPALOY,** INCONEL 718, HAYNES 263,à **WASPALOY is a trademark of United Technologies Corp., Hartford, CT.
INCONEL 718 is a trademark of Special Metals Corp., Huntington, WV.
*HAYNES 282 is a trademark of Haynes International, Kokomo, IN.
strengthened nickel-base superalloy, developed to meet the challenges of higher turbine service temperatures. The alloy exhibits a unique combination of excellent creep properties and thermal stability that meet and surpass those of the commonly used superalloys,
à HAYNES 263 is a trademark of Haynes International, Kokomo, IN.
and RENE 41.§[1] Joining of simple or complex shape turbine §
RENE is a trademark of General Electric Company, Fairfield, CT.
L.O. OSOBA, Doctoral Candidate, and O.A. OJO, Associate Professor, are with the Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg, MB, Canada R3T 5V6. Contact e-mail: [email protected] R.G. DING, Research Associate, is with the Department of Metallurgy and Materials Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom. Manuscript submitted September 27, 2011. Article published online September 1, 2012 METALLURGICAL AND MATERIALS TRANSACTIONS A
parts is an essential aspect of the manufacturing process. Also, during service, hot section components of turbine engines are subjected to different forms of thermal and mechanical stresses for a prolonged period of time that inevitably cause damage and limit component useful service life. The increasing high cost of procuring new parts and VOLUME 43A, NOVEMBER 2012—4281
associated delay in delivery time often necessitate that servicedamaged components are repaired in preference to total replacement. Laser beam welding (LBW) has attracted considerable interest in recent years for the fabrication and repair of advanced high-temperature alloys due to its speed, flexibility, high-energy concentration, and power transfer rate to produce low heat input welds with reduced heat-affected zone (HAZ) and physical distortions. A recent study on LBW of HAYNES alloy 282 by the present authors has shown that the alloy is susceptible to cracking in the HAZ.[2] An adequate understanding of the factors responsible for the susceptibility of the alloy to HAZ cracking is crucial to developing an improved procedure for joining the alloy by LBW. Therefore, the objective of this research is to perform a detailed systematic study to better understand the primary cause of the HAZ cracking and develop a viable and effective approach for improving resistance of the newly developed superalloy to cracking during LBW
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