Effect of Multiple Postweld Heat Treatment on the Weldability of Alloy 718

Abstract

This paper describes the effect of multiple postweld heat treatment thermal cycles on the weldability of both cast and wrought Alloy 7 18. The liquation cracking susceptibility of specially-melted alloys containing a range of niobium and boron contents was evaluated using the hot ductility test. Cracking susceptibility increased as a function of both composition and thermal cycling for the cast materials, while the wrought materials showed only a small influence of composition and effectively no deleterious effects from the multiple thermal cycles. Superalloys 718,625, 706 and Various Derivatives Edited by E.A. Loria The Minerals, Metals & Materials Society, 1997