Weldability and welding metallurgy of HAYNES 282 alloy

Abstract

Testing was conducted to determine the weldability of 282 alloy, specifically focused on its weld hot cracking susceptibility, namely, weld solidification and heat-affected zone (HAZ) liquation cracking. Weld solidification cracking susceptibility was evaluated through Varestraint testing. Based on total and maximum crack length measurements for two different production heats of 282 alloy containing nominal (0.005 wt%) and low (0.003 wt%) levels of boron, 282 alloy exhibits excellent solidification cracking resistance. The nominal boron heat exhibited higher crack lengths, demonstrating the adverse effect of boron on solidification cracking resistance. However, cracking susceptibility was still lower than many other high-temperature Ni-base alloys. The Gleeble hot-ductility test was utilized to determine the HAZ liquation cracking temperature range for 282 alloy in the age-hardened condition. These results suggest that 282 alloy has excellent resistance to HAZ liquation cracking. Hot-ductility test samples were characterized in order to understand HAZ microstructure evolution. The effect of postweld heat treatment on weld metal microstructure was also determined. Overall, the results indicate that 282 alloy possesses a unique combination of material properties and weldability.