Observations of directional gamma prime coarsening during engine operation

Conference · Sun Feb 01 00:00:00 EST 1987

OSTI ID:5925363

Draper, S L; Hull, D R; Dreshfield, R L

Two alloys with negative mismatch parameters, NASAIR 100 and a modified NASAIR 100 called Alloy 3 were run as turbine blades in an experimental ground based Garret TFE731 engine for up to 200 hr. The directional coarsening of gamma prime (rafting) that developed during engine testing was analyzed and compared to previous research from laboratory tests. The blades were found to be rafted normal to the centrifugal stress axis over much of the span, but near the surfaces, the blades were found to be rafted parallel to the centrifugal stress axis for certain cycles. Representative photomicrographs of the blades and the effects of stress and temperature on raft formation are shown.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 5925363
• Report Number(s): N-87-25459; NASA-TM-100105; E-3642; NAS-1.15:100105; CONF-870272-10
• Resource Relation: Conference: American Institute of Metallurgical Engineers annual meeting: light metals session, Denver, CO, USA, 22 Feb 1987
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL BASE ALLOYS
FATIGUE
MICROSTRUCTURE
STRAIN HARDENING
TURBINE BLADES
EXPERIMENTAL DATA
TEMPERATURE EFFECTS
ALLOYS
CRYSTAL STRUCTURE
DATA
HARDENING
INFORMATION
MECHANICAL PROPERTIES
NICKEL ALLOYS
NUMERICAL DATA
360103* - Metals & Alloys- Mechanical Properties