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The effect of stabilization treatments on disk alloy ch98
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gabb, Timothy P. Gayda, John Ellis, David L. |
| Copyright Year | 2003 |
| Description | Gas turbine engines for future subsonic transports will probably have higher pressure ratios which will require nickelbase superalloy disks with 1300 to 1400 F temperature capability. Several advanced disk alloys are being developed to fill this need. One of these, CH98, is a promising candidate for gas turbine engines and is being studied in NASA s Advanced Subsonic Technology (AST) program. For large disks, residual stresses generated during quenching from solution heat treatments are often reduced by a stabilization heat treatment, in which the disk is heated to 1500 or 1600 F for several hours followed by a static air cool. The reduction in residual stress levels lessens distortion during machining of disks. However, previous work on CH98 has indicated that stabilization treatments can also decrease creep capability. In this study, a systematic variation of stabilization temperature and time was investigated to determine its effect on 1300 F tensile and, more importantly, creep behavior. Dwell crack growth rates were also measured for selected stabilization conditions. As these advanced disk alloys may be given a supersolvus solution or a subsolvus solution heat treatment for a given application, it was decided that both options would be studied. |
| File Size | 4180733 |
| Page Count | 18 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20030068107 |
| Archival Resource Key | ark:/13960/t7wm67k18 |
| Language | English |
| Publisher Date | 2003-08-01 |
| Access Restriction | Open |
| Subject Keyword | Metals And Metallic Materials Creep Properties Heat Treatment Stabilization Heat Resistant Alloys Gas Turbine Engines Residual Stress Crack Propagation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
