1 of 45 VIEW FLA VIEW ALF CONCAVE SIDE CONVEX SIDE VIEWS OF HPT BLADE S/N 7AS93 OBSERVATIONS 2 of 45 • 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 3 of 45 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 4 of 45 ~ 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 5 of 45 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 6 of 45 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 7 of 45 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 8 of 45 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 9 of 45 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 10 of 45 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 11 of 45 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 12 of 45 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 13 of 45 OBSERVATIONS VIEW OF FRACTURE AREA EXHIBITING FATIGUE CRACK PROPAGATION ON BLADE S/N 7AS93 ORIGIN AREA 14 of 45 OBSERVATIONS ORIGIN AREA VIEW OF FRACTURE ORIGIN AREA ON BLADE S/N 7AS93 15 of 45 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 16 of 45 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. 17 of 45 BLADE 7AS93 - FRACTURE SURFACE - SEM LOCATION 1 BEI SEM BEI VIEW OF THE FRACTURE AREA IMMEDIATELY ADJACENT TO THE TRAILING EDGE OF BLADE 7AS93. 18 of 45 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 19 of 45 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 20 of 45 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 21 of 45 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 22 of 45 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 23 of 45 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 24 of 45 BLADE 7AS93 - MT. NO. 02-11113 VIEW OF FRACTURE ORIGIN AREA LOCATED ALONG CONCAVE SIDE OF AIRFOIL TRAILING EDGE. ORIGIN AREA OBSERVATIONS 25 of 45 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 26 of 45 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 27 of 45 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 28 of 45 BLADE 8AS10 - MT. NO. 02-11115 BLADE 8AS10 - MT. NO. 02-11115 FIRST SLOT SECOND SLOT CONCAVE CONVEX OBSERVATIONS 29 of 45 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. 30 of 45 FATIGUE ORIGIN AREA LOCATED AT FIRST TRAILING EDGE COOLING SLOT PRIMARY FRACTURE - HPT BLADE S/N 5BM74 31 of 45 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 32 of 45 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 33 of 45 PRIMARY FRACTURE - HPT BLADE S/N 5BM74 0.15 INCH ORIGIN AREA 34 of 45 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.作者: kinran 时间: 2011-6-4 22:58:13
