Inertia friction weld of superalloy with enhanced post weld heat treatment
AssigneeSiemens Energy, Inc.
InventorsGerald J. Bruck, Timothy V. Stotler, Wendell L. Johnson
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Abstract
A method of inertia friction welding a superalloy substrate, the method including: rotating and forcing a deposit material (110) against the superalloy substrate (100); plastically deforming at least one of the deposit material (110) and the superalloy substrate (100) to form a weld joining the deposit material (110) to the superalloy substrate (100), thereby forming an assembly; and heat-treating the assembly. Heat-treating includes: a post-weld intermediate stress-relief (ISR) treatment; a solutionizing treatment; and a precipitation hardening heat treatment.
Claims18
A method of inertia friction welding a superalloy substrate, the method comprising:
- rotating and forcing a deposit material against the superalloy substrate;
- plastically deforming at least one of the deposit material and the superalloy substrate to form a weld joint joining the deposit material to the superalloy substrate, thereby forming an assembly;
- and
- heat-treating the assembly, wherein the heat-treating comprises a post-weld intermediate stress-relief (ISR) treatment at an ISR treatment temperature below a solutionizing temperature of the superalloy substrate, followed by a solutionizing treatment, followed by a precipitation hardening heat treatment.
A method of heat treating a plastically welded assembly comprising a plasticized region comprising a superalloy substrate and a deposit material, the method comprising, in order:
- a post-weld intermediate stress-relief (ISR) treatment at an ISR treatment temperature below a solutionizing temperature of the superalloy substrate, wherein a residual stress in the plasticized region after the ISR treatment is less than 80% of a residual stress in the plasticized region before the ISR treatment;
- a solutionizing treatment;
- and an aging heat treatment.
A method of repairing a crack in a superalloy substrate, the method comprising:
- excavating first material thereby forming a first excavated portion of the superalloy substrate;
- rotating and forcing a deposit material into the first excavated portion of the superalloy substrate;
- plastically deforming at least one of the deposit material and the superalloy substrate to form a weld joint joining the deposit material to the superalloy substrate, thereby forming an assembly;
- and
- heat-treating the assembly, wherein the heat-treating comprises:
- a post-weld intermediate stress-relief (ISR) treatment at an ISR treatment temperature below a solutionizing temperature of the superalloy substrate and effective to reduce a cold working stress in the joint to below 35% of a superalloy substrate yield strength, followed by a solutionizing treatment, followed by a precipitation hardening heat treatment.
Dependencies are inferred from the claim text.