# US 2010/0163142 A1 · Oscillating heat treatment method for a superalloy > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0163142 A1 - Document ID: US20100163142A1 - Status: Published application - Kind: A1 - Application number: 12/226,551 - Filed: 2007-03-15 - Published: 2010-07-01 - Earliest claimed: 2006-04-26 - Inventors: Michael Ott; Rolf Wilkenhöner - Web page: https://patentgrep.com/patent/US20100163142A1 ## CPC - C22C 19/05: with chromium - C21D 1/785: {Thermocycling} - C22C 21/02: with silicon as the next major constituent - C22F 1/043: of alloys with silicon as the next major constituent - C22F 1/10: of nickel or cobalt or alloys based thereon - C21D 11/00: Process control or regulation for heat treatments - F05B 2230/40: Heat treatment - C22C: ALLOYS (treatment of alloys C21D, C22F) - C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B) - C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00) - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G ## Abstract Superalloy solidified in a directional manner often cannot be subjected to heat treatment because the heat treatment leads to recrystallization. As a result of the temperature profile during a heat treatment according to the invention which oscillates in the manner of a pendulum, a recrystallization during heat treatment can be avoided because mechanical stresses are reduced thanks to the recurring succession of dissolutions and precipitations of the precipitate. The method can be applied to a Ni-based superalloy with γ-precipitates. After the cyclic heat treatment, the temperature can be adjusted to and maintained at a temperature which is the same as or higher than the complete dissolution temperature. An oscillating movement can also take place above the complete dissolution temperature. ## Claims ### Claim at position 1 -28. (canceled) ### Claim 29 A method for heat treating a material having a precipitate that is dissolvable at least partially in a matrix of the material above a dissolution temperature, comprising: at least temporarily heat treating the material above the dissolution temperature via a temperature profile; and at least temporarily oscillating the temperature profile for the heat treatment. ### Claim 30 (depends on 29) The method as claimed in claim 29, wherein the temperature profile oscillates below the dissolution temperature and continues to increase at least temporarily above the dissolution temperature. ### Claim 31 (depends on 29) The method as claimed in claim 29, wherein the temperature profile oscillates above the dissolution temperature. ### Claim 32 (depends on 29) The method as claimed in claim 29, wherein the temperature profile initially rises to a temperature below the dissolution temperature and further oscillately rises. ### Claim 33 (depends on 29) The method as claimed in claim 29, wherein the temperature profile initially rises at least to the dissolution temperature and further oscillately rises. ### Claim 34 (depends on 29) The method as claimed in claim 29, wherein the temperature profile oscillates initially once or more than once from a temperature above the dissolution temperature to a temperature below the dissolution temperature. ### Claim 35 (depends on 29) The method as claimed in claim 29, wherein the temperature profile oscillates from a temperature above the dissolution temperature to a temperature not below the dissolution temperature. ### Claim 36 (depends on 29) The method as claimed in claim 29, wherein the oscillation is between two local maxima in the temperature profile and the temperature profile comprises at least two oscillations. ### Claim 37 (depends on 29) The method as claimed in claim 29, wherein the temperature profile oscillates for at least one hour. ### Claim 38 (depends on 29) The method as claimed in claim 29, wherein the temperature profile oscillates sinusoidally or triangularly. ### Claim 39 (depends on 29) The method as claimed in claim 29, wherein the precipitate is dissolved completely in the matrix at a full solution annealing temperature. ### Claim 40 (depends on 39) The method as claimed in claim 39, wherein the temperature profile oscillates between: the dissolution temperature and the full solution annealing temperature, or a temperature above the dissolution temperature and the full solution annealing temperature, or the dissolution temperature and a temperature below the full solution annealing temperature, or a temperature above the dissolution temperature and a temperature below the full solution annealing temperature, or a temperature below the dissolution temperature and the full solution annealing temperature. ### Claim 41 (depends on 39) The method as claimed in claim 39, wherein the temperature profile initially rises to a temperature below the dissolution temperature and further oscillately rises to the full solution annealing temperature. ### Claim 42 (depends on 39) The method as claimed in claim 39, wherein the temperature profile reaches the full solution annealing temperature during the oscillation at a specific time and is set constant at the full solution annealing temperature for the specific time. ### Claim 43 (depends on 42) The method as claimed in claim 42, wherein the temperature profile stays at the full solution annealing temperature for at least one hour. ### Claim 44 (depends on 39) The method as claimed in claim 39, wherein the temperature profile is set constant at a temperature above the full solution annealing temperature at a specific time. ### Claim 45 (depends on 39) The method as claimed in claim 39, wherein the temperature profile overshoots the full solution annealing temperature at a specific time. ### Claim 46 (depends on 29) The method as claimed in claim 29, wherein the temperature profile does not overshoot the full solution temperature. ### Claim 47 (depends on 29) The method as claimed in claim 29, wherein a metallic element of the material is depleted before the heat treatment. ### Claim 48 (depends on 29) The method as claimed in claim 29, wherein the precipitate is a γ-phase of a nickel-based superalloy.