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superalloys

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001758
EISBN: 978-1-62708-241-9
... at carbides and other microconstituents, especially in single crystal castings that do not possess grain boundaries. gas turbine engine components creep deformation overheating nickel-base superalloy interdendritic stress-rupture fracture stress-rupture testing stress-rupture life Cast nickel...
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Published: 01 January 2002
Fig. 7 Electron images of a superalloy shaft fracture. (a) Backscattered electron image. (b) Secondary electron image. Bright areas are lead contamination. More
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Published: 15 January 2021
Fig. 11 Fracture surfaces of a nickel-base superalloy turbine blade. (a) Secondary electron image of interdendritic stress-rupture fracture at the trailing edge (TE) of single-crystal turbine blade casting showing creep voids on the fracture surface. (b) Scanning electron microscopy More
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Published: 15 January 2021
Fig. 4 Cross section of a nickel-base superalloy after thermomechanical fatigue testing. Image shows surface oxidation at bottom and oxide spike forming in the center of the specimen. Chemical etchant used highlights aluminum in the microstructure. Microstructure shown as white in image More
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Published: 15 January 2021
Fig. 5 Single-crystal nickel-base superalloy specimens tested at a mechanical strain of 1.3%, a minimum temperature of 550 °C (1020 °F), a maximum temperature of 1050 °C (1920 °F), and 300 s cycles but having different thermomechanical fatigue (TMF) waveforms. (a) Out-of-phase TMF exhibiting More
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Published: 15 January 2021
Fig. 22 (a) Incipient melting in A286 superalloy. (b) Incipient melting showing widened grain boundaries in A286 superalloy. Marble’s etch. (c) Aluminum 6061 heated close to the melting point. Keller’s etch More
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Published: 15 January 2021
Fig. 24 (a) Etched Waspaloy superalloy. (b) Ti-6Al-4V with alpha case. 2% HF etch More
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Published: 15 January 2021
Fig. 7 Electron images of a superalloy shaft fracture. (a) Backscattered electron image. (b) Secondary electron image. Bright areas are lead contamination. More
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Published: 30 August 2021
Fig. 2 Deformation mechanism map for the cast nickel-base superalloy MAR-M200 with a grain size of 100 μm. Source: Ref 3 More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001829
EISBN: 978-1-62708-241-9
... Abstract An investigation was conducted to better understand the time-dependent degradation of thermal barrier coated superalloy components in gas turbines. First-stage vanes are normally subjected to the highest gas velocities and temperatures during operation, and were thus the focus...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001602
EISBN: 978-1-62708-229-7
... Abstract This article presents a failure analysis of 37.5 mW gas turbine third stage buckets made of Udimet 500 superalloy. The buckets experienced repetitive integral tip shroud fractures assisted by a low temperature (type II) hot corrosion. A detailed analysis was carried out on elements...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001657
EISBN: 978-1-62708-227-3
... Abstract The circumstances surrounding the in-service failure of a cast Ni-base superalloy (Alloy 713LC) second stage turbine blade and a cast and coated Co-base superalloy (MAR-M302) first stage air-cooled vane in two turbine engines used for marine application are described. An overview...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001311
EISBN: 978-1-62708-215-0
... Abstract Several nickel-base superalloy (UNS N06600) welded heat-exchanger tubes used in processing black liquor in a kraft paper mill failed prematurely. Leaking occurred through the tube walls at levels near the bottom tube sheet. The tubes had been installed as replacements for type 304...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001827
EISBN: 978-1-62708-241-9
... of high-temperature oxidation on the hot corrosion process. Preventative measures are also discussed. gas turbine thermal fatigue cracking hot corrosion superalloys corrosion cavities spark optical emission spectrometry operating temperature GTD 111 (cast nickel-base superalloy) FSX 414...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0091761
EISBN: 978-1-62708-229-7
... Abstract Turbine buckets in a 37.5-MW gas turbine made of Udimet 500 superalloy failed in service. The power plant was located 1 km (0.6 miles) from the Pacific Ocean and operated on No. 2 diesel fuel, which was supplied by tanker ship. Turbine bucket failures occurred on three units after 2500...
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Published: 15 January 2021
Fig. 10 (a) Creep damage in a tube. (b) Creep void in carbon steel showing oxide and decarburization. Nital etch. (c) Beginning creep in Manaurite superalloy. Marble’s etch. (d) Advanced creep in same Manaurite superalloy shown in (c). Marble’s etch. (e) Scanning electron microscope image More
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Published: 15 January 2021
Fig. 6 (a) Cross section near the fracture surface of a single-crystal nickel-base superalloy tested in thermomechanical fatigue (TMF) conditions. Note the oxide spike emanating from the fracture surface and the oxidized slip planes. The oxide spike occurs along an active slip plane More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
.... The article discusses metallurgical instabilities of steel-based alloys and nickel-base superalloys. It provides information on several life assessment methods, namely, the life fraction rule, parameter-based assessments, the thermal-mechanical fatigue, coating evaluations, hardness testing, microstructural...
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...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001840
EISBN: 978-1-62708-241-9
.... bimetal plate shear failure impact energy nickel-base superalloy carbon steel plastic deformation shear testing adhesion strength Inconel 625 (nickel-base superalloy) UNS N06625 ASTM A517 (low carbon steel) Introduction Despite the fact that Inconel 625 as a nickel-based superalloy...