NDLI: The effect of tungsten additions on disk alloy ch98

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The effect of tungsten additions on disk alloy ch98

Content Provider	NASA Technical Reports Server (NTRS)
Author	Gabb, Timothy P. Gayda, John
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 in the range of 1500 to 1600 F for several hours followed by a static air cool and age. The reduction in residual stress levels lessens distortion during machining of disks. Previous work on CH98 has indicated that stabilization treatments will decrease creep capability, however, tungsten additions appear to improve the creep capability of stabilized and aged CH98. In this study, a systematic variation of tungsten additions to CH98 was investigated. Specifically, the 1300 F tensile, creep, and fatigue crack growth properties of stabilized CH 98 were assessed with varying levels of tungsten additions.
File Size	1289039
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20040035595
Archival Resource Key	ark:/13960/t3zs7pv87
Language	English
Publisher Date	2003-08-01
Access Restriction	Open
Subject Keyword	Metals And Metallic Materials Creep Properties Heat Resistant Alloys Fatigue Materials Gas Turbine Engines Distortion Pressure Ratio Tungsten Alloys Tensile Creep 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

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