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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001228
EISBN: 978-1-62708-229-7
... Abstract In an electric power station, seven turbine blades out of 112 broke or cracked within 8 to 14 months after commencement of operation. The blades in question were all located on the last running wheel in the low pressure section of a 35,000 kW high pressure condensing turbine. They were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0090181
EISBN: 978-1-62708-229-7
... Abstract Cracking in gas turbine blades was found to initiate from a mechanism of low-cycle fatigue (LCF). LCF is induced during thermal loading cycles in gas turbines. However, metallography of two cracked blades revealed a change in microstructure at as-cast surfaces for depths up to 0.41 mm...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001193
EISBN: 978-1-62708-229-7
... Abstract When a steam turbine was put out of service, cracks were noticed on many of the blades in the low pressure section round the stabilization bolts and perpendicular to the blade axis. The blades were made from chrome alloy steel X20-Cr13 (Material No. 1.402). When the bolts were brazed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c0046969
EISBN: 978-1-62708-227-3
... Abstract Aluminide-coated and uncoated IN-713 turbine blades were returned for evaluation after service in a marine environment because of severe corrosion. Based on service time, failure of these blades by corrosive deterioration was considered to be premature. Analysis (visual inspection...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001756
EISBN: 978-1-62708-241-9
... Fig. 1 Schematic layout of a twin-spool turbofan engine Fig. 2 Engine RPM drop after the incident Fig. 5 Damages in LP turbine rotor assembly Fig. 6 Failed LP turbine blades Fig. 7 Damages in exhaust cone mixer assembly Fig. 3 Failed HP turbine...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001357
EISBN: 978-1-62708-215-0
... Abstract Two 20 MW turbines suffered damage to second-stage blades prematurely. The alloy was determined to be a precipitation-hardening nickel-base superalloy comparable to Udimet 500, Udimet 710, or Rene 77. Typical protective coatings were not found. Test results further showed that the fuel...
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Published: 01 June 2019
Fig. 1 Uncoated and aluminide-coated IN-713 turbine blades that failed by hot corrosion in a marine environment. (a) An uncoated blade showing splitting along the leading edge and swelling on the surface of the airfoil. 2.7x. (b) Section taken through the leading edge of an uncoated blade More
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Published: 01 June 2019
Fig. 1 Micrographs of two turbine blades that failed by thermal fatigue. (a) Longitudinal section taken through origin of failure (upper left corner) of fractured blade showing the fracture surface in profile (top), oxidation on blade surface (left), and oxide-filled crack (arrow). 500x. (b More
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Published: 01 December 2019
Fig. 3 Failed HP turbine blades More
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Published: 01 December 2019
Fig. 6 Failed LP turbine blades More
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Published: 01 December 2019
Fig. 8 HP turbine blades under micro examination More
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Published: 01 December 2019
Fig. 2 Macroetched turbine blades showing characteristic grain structure for equiaxed (EQ), directionally solidified (DS), and single crystal (SX) castings. Off-axis grain boundaries in DS and SX castings significantly improve creep resistance and overall stress rupture life compared to an EQ More
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Published: 01 January 2002
Fig. 11 Hot corrosion attack of René 77 nickel-base alloy turbine blades. (a) Land-based, first-stage turbine blade. Notice deposit buildup, flaking, and splitting of leading edge. (b) Stationary vanes. (c) A land-based, first-stage gas turbine blade that had type 2 hot corrosion attack. (d More
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Published: 01 January 2002
Fig. 12 Heat-damaged turbine blades. (a) Heat-damaged first- or second-stage turbine blade (A), which remained intact but with a darkened appearance. It is common to have blades that appear to be in relatively good condition but with an underlying overtemperature condition. (b) Two third-stage More
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Published: 01 January 2002
Fig. 13 Flow diagram for remaining life assessment of gas turbine blades More
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Published: 01 January 2002
Fig. 14 Sectioning of turbine blades for metallographic examination. (a) Typical locations for cross sectioning of turbine blades. (b) View of Sectioned blade More
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Published: 30 August 2021
Fig. 12 (a) Photograph showing one of the intact steam turbine blades from the failed stage. The arrow indicates the fracture location. (b) Photograph of the fracture surface. Scale: millimeters. (c) Scanning electron fractograph of the initiation region showing a mixed transgranular More
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Published: 30 August 2021
Fig. 28 (a) Photograph of fourth-stage turbine blades prior to removal. The first blade to fail is indicated with an arrow; an exhaust thermocouple is shown in the foreground. (b) Photograph of blade fracture surface after sectioning. Note the blue discoloration at the trailing edge. (c More
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001412
EISBN: 978-1-62708-229-7
... Abstract Three blades from 45,000 kW, 3,000 rpm turbine were received for examination, comprising the root of blade 28, blade 89 showing a crack in one of the root teeth, and blade 106 which was free from defects. Microscopic examination of the blade material showed it to be a ferritic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001143
EISBN: 978-1-62708-229-7
... Abstract The assignment of financial liability for turbine blade failures in steam turbines rests on the ability to determine the damage mechanism or mechanisms responsible for the failure. A discussion is presented outlining various items to look for in a post-turbine blade failure...