NDLI: Advanced single crystal for ssme turbopumps

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Advanced single crystal for ssme turbopumps

Content Provider	NASA Technical Reports Server (NTRS)
Author	Fritzemeier, L. G.
Copyright Year	1989
Description	The objective of this program was to evaluate the influence of high thermal gradient casting, hot isostatic pressing (HIP) and alternate heat treatments on the microstructure and mechanical properties of a single crystal nickel base superalloy. The alloy chosen for the study was PWA 1480, a well characterized, commercial alloy which had previously been chosen as a candidate for the Space Shuttle Main Engine high pressure turbopump turbine blades. Microstructural characterization evaluated the influence of casting thermal gradient on dendrite arm spacing, casting porosity distribution and alloy homogeneity. Hot isostatic pressing was evaluated as a means of eliminating porosity as a preferred fatigue crack initiation site. The alternate heat treatment was chosen to improve hydrogen environment embrittlement resistance and for potential fatigue life improvement. Mechanical property evaluation was aimed primarily at determining improvements in low cycle and high cycle fatigue life due to the advanced processing methods. Statistically significant numbers of tests were conducted to quantitatively demonstrate life differences. High thermal gradient casting improves as-cast homogeneity, which facilitates solution heat treatment of PWA 1480 and provides a decrease in internal pore size, leading to increases in low cycle and high cycle fatigue lives.
File Size	3351880
Page Count	54
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890011701
Archival Resource Key	ark:/13960/t8kd6sw1b
Language	English
Publisher Date	1989-03-01
Access Restriction	Open
Subject Keyword	Metallic Materials Single Crystals Casting Fatigue Life Turbine Pumps Heat Treatment Nickel Alloys Heat Resistant Alloys Space Shuttle Main Engine Hot Isostatic Pressing Mechanical Properties Process Control Industry Microstructure 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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