HPT BLADE OBSERVATIONS

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VIEW
FLA
VIEW
ALF
CONCAVE SIDE
CONVEX SIDE
VIEWS OF HPT BLADE S/N 7AS93
OBSERVATIONS
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• P/N 1668M46P08 HPT blades
• 7 HPT blades broken
- 5/8 mm above platform
• Evidence of heavy rub on the tip
• Seal ring broken
•
EESSNN773311--776677HHPPTTBBllaaddeess
BACKGROUND TO
INVESTIGATION
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BACKGROUND TO
INVESTIGATION
EESSNN773311--224411HHPPTTBBllaaddeess
HPT BLADE MISSING
ABOUT 1/2 OF AIRFOIL
IMPACT DAMAGE
• P/N 1668M46P08 HPT blades
• 1 HPT blade missing about 1/2 of airfoil
• Impact damage to trailing edge of several other
HPT blades
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~ 0.75 INCH
OF FATIGUE
PROPAGATION
ALONG CONCAVE WALL
~ 0.40 INCH
OF FATIGUE
PROPAGATION
ALONG CONVEX WALL
VIEWS OF AIRFOIL FRACTURE ON BLADE S/N 7AS93 SHOWING POSITION OF ORIGIN
AT TRAILING EDGE RELATIVE TO BLADE PLATORM AND EXTENT OF
FATIGUE PROPAGATION ALONG CONCAVE AND CONVEX AIRFOIL WALLS
0.15 INCH
ORIGIN AREA
ALONG PRESSURE SIDE
OF TRAILING EDGE
OBSERVATIONS
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ORIGIN AREA
ALONG PRESSURE SIDE
OF TRAILING EDGE
FATIGUE
OVERLOAD
VIEW OF BLADE S/N 7AS93 ILLUSTRATING PORTION OF AIRFOIL FRACTURE
WHICH EXHIBITED FATIGUE CRACK PROPAGATION
OVERLOAD
OBSERVATIONS
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S/N 0AN48 S/N 8AS10 S/N 2BE85 S/N 0AN48 S/N 8AS10 S/N 2BE85
IMPACT DAMAGE
CONVEX SIDE CONCAVE SIDE
HPT BLADES REMOVED FROM ESN 731-241 WHICH EXHIBITED
IMPACT DAMAGE TO AIRFOIL TRAILING EDGE
OBSERVATIONS
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S/N 0AN48 S/N 8AS10 S/N 2BE85 S/N 0AN48 S/N 8AS10 S/N 2BE85
VIEW
FLA
VIEW
ALF
HPT BLADES REMOVED FROM ESN 731-241 WHICH EXHIBITED
IMPACT DAMAGE TO AIRFOIL TRAILING EDGE
OBSERVATIONS
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S/N 0AN48 - TRAILING EDGE
S/N 8AS10 - TRAILING EDGE
S/N 2BE85 - TRAILING EDGE
VIEWS OF THE PRESSURE SIDE OF THE AIRFOIL TRAILING EDGE ON
THE THREE HPT BLADES REMOVED FROM ESN 731-241 WHICH EXHBITED IMPACT DAMAGE
OBSERVATIONS
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S/N 0AN48 - SEM BEI VIEW OF FIRST T/E SLOT
S/N 0AN48 - SEM BEI VIEW OF FIRST T/E SLOT
SEM BEI VIEWS SHOWING MULTIPLE CRACKS VISIBLE ALONG PRESSURE SIDE OF
TRAILING EDGE AT FIRST SLOT ON BLADE S/N 0AN48
OUTBOARD
OBSERVATIONS
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S/N 8AS10 - SEM BEI VIEW OF FIRST T/E SLOT
SEM BEI VIEWS SHOWING MULTIPLE CRACKS VISIBLE ALONG PRESSURE SIDE OF
TRAILING EDGE AT FIRST SLOT ON BLADE S/N 8AS10
S/N 8AS10 - SEM BEI VIEW OF FIRST T/E SLOT
OUTBOARD
OBSERVATIONS
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S/N 2BE85 - SEM BEI VIEW OF FIRST T/E SLOT
SEM BEI VIEWS SHOWING MULTIPLE CRACKS VISIBLE ALONG PRESSURE SIDE OF
TRAILING EDGE AT FIRST SLOT ON BLADE S/N 2BE85
S/N 2BE85 - SEM BEI VIEW OF FIRST T/E SLOT
OUTBOARD
OBSERVATIONS
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OUTBOARD
S/N 7AS93 - SEM BEI VIEW OF FIRST T/E SLOT
SEM BEI VIEWS OF
PRESSURE SIDE OF TRAILING EDGE ADJACENT TO FRACTURE ORIGIN ON BLADE S/N 7AS93.
NO OTHER CRACKS WERE VISIBLE ALONG THE PRESSURE SIDE SURFACE.
S/N 7AS93 - SEM BEI VIEW OF FIRST T/E SLOT
ORIGIN AREA
ALONG PRESSURE SIDE
OF TRAILING EDGE
OBSERVATIONS
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OBSERVATIONS
VIEW OF FRACTURE AREA EXHIBITING FATIGUE CRACK PROPAGATION ON BLADE S/N 7AS93
ORIGIN
AREA
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OBSERVATIONS
ORIGIN
AREA
VIEW OF FRACTURE ORIGIN AREA ON BLADE S/N 7AS93
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1
2
3
4
5
BLADE 7AS93 - FRACTURE SURFACE
VIEW OF FATIGUE PORTION OF BLADE 7AS93 FRACTURE SURFACE WITH THE NUMBERED
SITES INDICATING AREAS DOCUMENTED WITH SEM IMAGES SHOWN ON SUBSEQUENT PAGES
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1-A
BLADE 7AS93 - FRACTURE SURFACE - SEM LOCATION 1 SEI
SEM SEI VIEW OF THE FRACTURE AREA IMMEDIATELY ADJACENT
TO THE TRAILING EDGE OF BLADE 7AS93. THE WHITE ARROWS DEPICT THE
DIRECTION OF FATIGUE CRACK GROWTH.
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BLADE 7AS93 - FRACTURE SURFACE - SEM LOCATION 1 BEI
SEM BEI VIEW OF THE FRACTURE AREA IMMEDIATELY ADJACENT
TO THE TRAILING EDGE OF BLADE 7AS93.
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1-B
BLADE 7AS93 - FRACTURE SURFACE
SEM LOCATION 1-A SEI
BLADE 7AS93 - FRACTURE SURFACE
SEM LOCATION 1-A BEI
SEM VIEWS OF THE FRACTURE ORIGIN AREA OF BLADE 7AS93
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BLADE 7AS93 - FRACTURE SURFACE
SEM LOCATION 1-B SEI
BLADE 7AS93 - FRACTURE SURFACE
SEM LOCATION 1-B BEI
ADDITIONAL SEM VIEWS OF THE FRACTURE ORIGIN AREA OF BLADE 7AS93
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OBSERVATIONS
ORIGIN
AREA
S/N 7AS93 - SEM BEI VIEW T/E FRACTURE NEAR ORIGIN
S/N 7AS93 - SEM BEI VIEW T/E FRACTURE NEAR ORIGIN
SEM BEI VIEWS OF FRACTURE ORIGIN AREA ON BLADE S/N 7AS93 OBTAINED WITH
SAMPLE TILTED TO SHOWTHE TRAILING EDGE AND CONCAVE AIRFOIL SURFACES
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BLADE 7AS93 - FRACTURE SURFACE
SEM LOCATION 2 SEI
BLADE 7AS93 - FRACTURE SURFACE
SEM LOCATION 3 SEI
SEM VIEWS OF FRACTURE LOCATIONS 2 AND 3 ON THE FRACTURE SURFACE OF
BLADE 7AS93. REFER TO PAGE 20 FOR LOCATION ON FRACTURE.
OBSERVATIONS
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BLADE 7AS93 - FRACTURE SURFACE
SEM LOCATION 4 SEI
BLADE 7AS93 - FRACTURE SURFACE
SEM LOCATION 5 SEI
SEM VIEWS OF FRACTURE LOCATIONS 4 AND 5 ON THE FRACTURE SURFACE OF
BLADE 7AS93. REFER TO PAGE 20 FOR LOCATION ON FRACTURE.
OBSERVATIONS
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BLADE 7AS93 - MT. NO. 02-11113 BLADE 7AS93 - MT. NO. 02-11113
VIEWS OF TRAILING EDGE SECTION THROUGH BLADE 7AS93. AT THIS PLANE OF POLISH,
THE TRAILING EDGE THICKNESS MEASURED 0.022, INCLUDING 0.028 INCH COATING ON
THE CONCAVE SIDE AND 0.0039 INCH COATING ON THE CONVEX SIDE.
CONCAVE CONVEX
FRACTURE 0.0028 INCH 0.0039 INCH
OBSERVATIONS
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BLADE 7AS93 - MT. NO. 02-11113
VIEW OF FRACTURE ORIGIN AREA LOCATED ALONG CONCAVE SIDE OF AIRFOIL TRAILING EDGE.
ORIGIN AREA
OBSERVATIONS
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BLADE 7AS93 - MT. NO. 02-11114 BLADE 7AS93 - MT. NO. 02-11114
VIEWS OF METALLOGRAPHIC SECTION THROUGH THE AXIAL CENTER OF THE FIRST
TRAILING EDGE SLOT ON BLADE 7AS93. THE COATING ALONG THE CONCAVE SIDE OF THE
AIRFOIL MEASURED 0.0020 INCH IN THICKNESS.
CONCAVE CONVEX
0.0020 INCH
FRACTURE
OBSERVATIONS
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CONCAVE CONVEX
FRACTURE
ORIGIN AREA EDS-1
SEM BEI VIEWS OF TRAILING EDGE SECTION THROUGH BLADE 7AS93. EDS ANALYSIS OF THE
BLADE MATERIAL WAS OBTAINED AT SITE LABELED “EDS-1”.
BLADE 7AS93 - MT. NO. 02-11113
SEM BEI VIEW
BLADE 7AS93 - MT. NO. 02-11113
SEM BEI VIEW
OBSERVATIONS
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CONCAVE CONVEX
EDS-2
EDS-3
SEM BEI VIEWS OF TRAILING EDGE SECTION THROUGH BLADE 7AS93 SHOWING COATING
ON BOTH THE CONCAVE AND CONVEX SIDE OF TRAILING EDGE. EDS ANALYSES OF THE
COATING WERE OBTAINED AT SITES LABELED “EDS-2” AND “EDS-3”.
BLADE 7AS93 - MT. NO. 02-11113
SEM BEI VIEW OF COATING ON CONCAVE SIDE
BLADE 7AS93 - MT. NO. 02-11113
SEM BEI VIEW OF COATING ON CONVEX SIDE
OBSERVATIONS
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BLADE 8AS10 - MT. NO. 02-11115
BLADE 8AS10 - MT. NO. 02-11115
FIRST SLOT
SECOND SLOT
CONCAVE CONVEX
OBSERVATIONS
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OBSERVATIONS
BLADE 7AS93 - MT. NO. 02-11113 - POLISH P2 BLADE 7AS93 - MT. NO. 02-11113 - POLISH P2
CONCAVE CONVEX
PHOTOMICROGRAPHS OBTAINED FROM METALLOGRAPHIC SECTION THROUGH
TRAILING EDGE OF BLADE 7AS93 AFTER AN ADDITIONAL STEP POLISH OF 0.015 INCH.
THE TRAILING EDGE THICKNESS AT THIS LOCATION MEASURED 0.025 INCH.
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FATIGUE ORIGIN AREA
LOCATED AT FIRST TRAILING
EDGE COOLING SLOT
PRIMARY FRACTURE - HPT BLADE S/N 5BM74
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1.0 INCH
0.90 INCH
FROM AIRFOIL TRAILING EDGE, FATIGUE PROPAGATION EXTENDED
FOR DISTANCE OF 1.0 INCH ALONG CONCAVE SIDE OF AIRFOIL
AND 0.90 INCH ALONG
CONVEX SIDE OF AIRFOIL
PRIMARY FRACTURE - HPT BLADE S/N 5BM74
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PRIMARY FRACTURE - HPT BLADE S/N 5BM74
MULTIPLE FATIGUE ORIGINS
ALONG CONCAVE SIDE OF
TRAILING EDGE AT A DISTANCE OF
0.15 TO 0.20 FROM TRAILING EDGE
WHITE ARROWS DEPICT
DIRECTION OF FATIGUE
PROPAGATION.
BOUNDARY OF
FATIGUE PROPAGATION
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PRIMARY FRACTURE - HPT BLADE S/N 5BM74
0.15 INCH
ORIGIN AREA
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FORWARD FACE AFT FACE
PRIMARY FRACTURE - HPT BLADE S/N 5BM74
HPT BLADE S/N 5BM74 MARKED AS POSITION NO. 23.
NO REPAIR MARKINGS WERE OBSERVED.

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HPT BLADE OBSERVATIONS