Method for manufacturing a turbine wheel

Patent metadata

Field	Value
Publication number	US-10370972-B2
Application number	US-201615543145-A
Country	US
Kind code	B2
Filing date	Jan 12, 2016
Priority date	Jan 16, 2015
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

A method for manufacturing a turbine wheel comprising casting the turbine wheel from an austenitic nickel-chromium-based superalloy, subjecting the cast turbine wheel to hot isostatic pressing and then subjecting a surface of the hot isostatically pressed turbine wheel to plastic deformation, wherein said hot isostatic pressing is effected at a pressure of 98 to 200 MPa and a temperature of 1160 to 1220° C. for a time period of 225 to 300 minutes. There is further described a hot isostatically pressed cast turbine wheel manufactured from an austenitic nickel-chromium-based superalloy, the turbine wheel having a plastically deformed surface; and a turbocharger incorporating such a turbine wheel.

First claim

What is claimed is:

1. A method for manufacturing a turbine wheel comprising casting the turbine wheel from an austenitic nickel-chromium-based superalloy, subjecting the cast turbine wheel to hot isostatic pressing and then subjecting a surface of the hot isostatically pressed turbine wheel to plastic deformation, wherein said hot isostatic pressing is effected at a pressure of 98 to 200 MPa and a temperature of 1160 to 1220° C. for a time period of 225 to 300 minutes.

2. A method according to claim 1 , wherein said hot isostatic pressing is effected at a pressure of 98 to 108 MPa.

3. A method according to claim 1 , wherein said hot isostatic pressing is effected at a temperature of 1190 to 1210° C.

4. A method according to claim 1 , wherein said hot isostatic pressing is effected for a time period of 225 to 255 minutes.

5. A method according to claim 1 , wherein said turbine wheel is cooled to a temperature of around 18 to 25° C. after said hot isostatic pressing and before said plastic deformation.

6. A method according to claim 5 , wherein said turbine wheel is cooled at a rate of less than or equal to around 100° C. per minute after said hot isostatic pressing and before said plastic deformation.

7. A method according to claim 5 , wherein said turbine wheel is cooled at a rate of less than or equal to around 10° C. per minute after said hot isostatic pressing and before said plastic deformation.

8. A method according to claim 1 , wherein said plastic deformation is achieved using shot peening.

9. A method according to claim 8 , wherein said shot peening employs high carbon cast steel shot conforming to SAEJ827.

10. A method according to claim 8 , wherein said shot has a minimum size of S070 to S240 in accordance with SAEJ444.

11. A method according to claim 8 , wherein said shot has a minimum size of S110 in accordance with SAEJ444.

12. A method according to claim 8 , wherein said shot peening is effected at an intensity to achieve an Almen ‘A’ strip arc height of 0.127 to 0.305 mm measured in accordance with SAEJ442.

13. A method according to claim 8 , wherein said shot peening is effected at an intensity to achieve an Almen ‘A’ strip arc height of 0.127 to 0.203 mm measured in accordance with SAEJ442.

14. A turbine wheel produced using the method of claim 1 .

Assignees

• Cummins Ltd

Inventors

• Rhodes Katie
• Winwood Sean

Classifications

• B22D25/02

  by its peculiarity of shape; of works of art {(cylinders, pistons B22D15/02)} · CPC title

• F05D2230/90

  Coating; Surface treatment · CPC title

• C22C38/02

  containing silicon · CPC title

• B24C1/10

  for compacting surfaces, e.g. shot-peening (for deforming sheet metal, tubes or profiles B21D31/06; as a metallurgical treatment C21D7/00, C22F1/00) · CPC title

• C22C38/04

  containing manganese · CPC title