Method of making heat resistant heavy-duty components of a turbine by superplasticity forging wherein different alloys are junctioned
US4825522A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1987 |
| Grant date | May 2, 1989 |
| Priority date | — |
| Expiry date | Sep 29, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/4998
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The method concerns fabricating heat-resistant heavy-duty components of a rbine, e.g. disk, wheel, etc. wherein two or more different kinds of alloys are junctioned, which comprises solidifying the one alloy powder by hot isostatic pressing or extrusion, junctioning and solidifying the solidified alloy with the other alloy powder by hot isostatic pressing or extrusion, and subjecting the alloys thus obtained to superplasticity forging thereby to secure the junction boundary. Ni-base superalloys having different complete solid solution temperatures of gamma prime phase are selected for use in the hub and rim of a turbine disk or the like, the one alloy which is higher in the temperature being disposed for the hub and the other alloy for the rim. The difference in the temperature between both alloys is at least 8.degree. C. Further solution heat treatment is performed at a temperature between the complete solid solution temperatures to adjust crystal grain size. Heat-resistant heavy-duty components of a turbine, e.g. disk, etc. are thus fabricated by superplasticity forging from Ni-base superalloys.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.