Method for producing turbine blade

Patent metadata

Field	Value
Publication number	US-11020810-B2
Application number	US-201716320643-A
Country	US
Kind code	B2
Filing date	Oct 5, 2017
Priority date	Oct 7, 2016
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

A method of manufacturing a turbine blade includes a brazing treatment for joining a brazing material to a base material of a turbine blade by heating the base material having the brazing material arranged thereon and melting the brazing material, a stabilizing treatment for heating the base material having been subjected to the brazing treatment; and an aging treatment for heating the base material having been subjected to the stabilizing treatment. The brazing treatment and the stabilizing treatment are performed with a sequential heating treatment.

First claim

The invention claimed is:

1. A method of manufacturing a turbine blade, the method comprising:
solutionizing a base material of a turbine blade at a temperature higher than a solidus temperature of a brazing material;
after the solutionizing, performing a brazing treatment to join a brazing material to the base material by heating the base material having the brazing material arranged thereon and melting the brazing material;
after the brazing treatment, performing a stabilizing treatment by heating the base material having the brazing material; and
after the stabilizing treatment, performing an aging treatment by heating the base material, the aging treatment being performed at a temperature lower than the solidus temperature of the brazing material,
wherein the brazing treatment and the stabilizing treatment are sequentially performed.

2. The method of manufacturing a turbine blade according to claim 1 , wherein the brazing treatment and the stabilizing treatment are performed at a first temperature higher than a liquidus temperature of the brazing material, the first temperature being a temperature at which a γ′ phase precipitated in the base material is increased.

3. The method of manufacturing a turbine blade according to claim 1 , further comprising an adjusting treatment for adjusting a heating temperature for the aging treatment to a second temperature, the adjusting treatment being performed after the brazing treatment and the stabilizing treatment are performed at a first temperature.

4. The method of manufacturing a turbine blade according to claim 3 , wherein the second temperature is lower than the first temperature.

5. The method of manufacturing a turbine blade according to claim 3 ,
wherein the brazing treatment, the stabilizing treatment, and the aging treatment are performed in a predetermined heating furnace including a heater, and
wherein, in the adjusting treatment, a furnace internal temperature is lowered by stopping the heater or by stopping the heater and supplying a cooling air to the heating furnace.

6. The method of manufacturing a turbine blade according to claim 3 ,
wherein the brazing treatment, the stabilizing treatment, and the aging treatment are performed in a predetermined heating furnace including a heater, and
wherein, in the adjusting treatment, the heater is operated, and the furnace internal temperature rises to the second temperature after the furnace internal temperature is lowered to a third temperature lower than the second temperature.

7. The method of manufacturing a turbine blade according to claim 1 , the method further comprising:
forming an undercoat on a surface of the base material through use of a metallic material having a higher oxidation-resisting property than the base material; and
forming a topcoat on a surface of the undercoat after the undercoat is formed,
wherein the topcoat is formed after the base material is subjected to the brazing treatment and the stabilizing treatment, and
wherein the aging treatment is performed after the topcoat is formed.

8. The method of manufacturing a turbine blade according to claim 7 , wherein the undercoat is formed after the brazing treatment and the stabilizing treatment are performed.

9. The method of manufacturing a turbine blade according to claim 1 , the method further comprising:
forming an undercoat on a surface of the base material through use of a metallic material having a higher oxidation-resisting property than the base material; and
forming a topcoat on a surface of the undercoat after the undercoat is formed,
wherein the topcoat is formed after the undercoat is formed and the base material is subjected to the brazing treatment, the stabilizing treatment, and the aging treatment.

Assignees

• Mitsubishi Hitachi Power Sys
• Mitsubishi Power Ltd

Inventors

• Yoshida Daisuke
• Taneike Masaki
• Inoue Yoshiyuki
• Kawai Hisataka
• Kitagaki Hisashi

Classifications

• F01D5/286 Primary

  Particular treatment of blades, e.g. to increase durability or resistance against corrosion or erosion (F01D5/288 takes precedence) · CPC title

• F05D2230/40

  Heat treatment · CPC title

• C22F1/002

  by rapid cooling or quenching; cooling agents used therefor · CPC title

• F01D5/28

  Selecting particular materials; {Particular measures relating thereto;} Measures against erosion or corrosion · CPC title

• B23K1/00

  Soldering, e.g. brazing, or unsoldering (B23K3/00 takes precedence) · CPC title