New Materials in the Design and Manufacturing of Hot Structures for Aircraft Engines – Allvac 718Plus

Paper i proceeding, 2009

Several efforts have been made to develop an alloy with the same versatility as the most common superalloy, Alloy 718, but with an ability to meet operating requirements for aircraft engine parts at 50 ºC higher temperature, i.e. 700 ºC. None of these alloy development efforts have been very successful for various reasons. Today a new promising alloy, Allvac 718Plus, has emerged as result of a joint effort between metal producers and aircraft engine companies. The weldability of this new alloy was examined in comparison with that of alloy 718 both by normal Varestraint and by Tranvarestraint testing. The results indicate that the weldability of 718Plus is at par with alloy 718 which also makes this alloy an interesting candidate for the Volvo Aero assembly type hot structural parts. However, the alloy must be offered in form of sheet material and as castings before the full potential can be used in such structures.