Welding of gamma'-strengthened superalloys

Abstract

A method of welding γ′-strengthened superalloys. The methods improve the weldability of these superalloys by creating areas having lower amounts of γ′-forming elements, resulting in stronger welds. In one method, a vacuum heat treatment is used to create γ′-depleted zones having reduced amounts of γ′-forming elements. A post weld heat treatment may then be used. In another method, a γ-stabilizing element, such as Cr or Ni, is deposited on the area to be welded. Again, a post weld heat treatment may then be used.

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