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thermal-barrier coated 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.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 of the...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003555
EISBN: 978-1-62708-180-1
... coatings, thermal barrier coatings, and ceramic coatings. aluminide coatings carburization ceramic coatings chloridation corrosion fatigue high temperature corrosion hot corrosion hydrogen interaction metal dusting molten metals molten salts overlay coatings oxidation protective coatings...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
...., gaseous contaminants and two or more main gases) and other operational factors. Preferential grain-boundary oxidation, thermal cycling, internal oxidation, the presence of moisture, and chloride- and sulfur-containing gases shorten service compared with those predicted from isothermal oxidation. Loss...
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
... coatings: Coating systems that during diffusion produce intermetallic compounds (mainly aluminides), in this case NiAl Complex alloy coating systems based on Ni-Cr-Al-X, where X is an active element that promotes oxide scale adhesion Coating systems that work as thermal barriers (metal-ceramic...
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
... hot parts, a ceramic thermal barrier coating (TBC) is applied. Metals and alloys are known to experience accelerated oxidation when their surfaces are covered with a thin film of fused salt in an oxidizing gas atmosphere at elevated temperatures. This is known as high temperature or “hot...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... energy that must be overcome for a chemical process to proceed. When taking into account a (more) complete energy balance, one may find that thermal energy and mechanical energy imparted to the system combine to overcome the barrier to activation. In that case, the Arrhenius relationship may be expressed...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
... Abstract The principal types of elevated-temperature mechanical failure are creep and stress rupture, stress relaxation, low- and high-cycle fatigue, thermal fatigue, tension overload, and combinations of these, as modified by environment. This article briefly reviews the applied aspects of...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
...-Base Superalloys , J. Nucl. Energy Des. , Vol 133 , 1992 , p 383 – 389 10.1016/0029-5493(92)90164-Q 6. Sehitoglu H. , Thermal and Thermomechanical Fatigue of Structural Alloys , Fatigue and Fracture , Vol 19 , ASM Handbook , ASM International , 1996 , p 527 – 556 7...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001109
EISBN: 978-1-62708-214-3
... process. The basic cause of degradation was found to be hot corrosion caused by the deposition of alkali sulfates and chlorides. However this degradation may have been aggravated by thermal cycling and abrasion. The source of the salt was impurities in the flux. Two potential solutions were proposed...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003568
EISBN: 978-1-62708-180-1
.... , Development of 1232 °C (2250 °F) Erosion and Impact Tests for Thermal Barrier Coatings , Tribol. Trans. , Vol 41 , 1998 , p 399 – 410 44. Smeltzer C.E. , Gulden M.E. , and Compton W.A. , Mechanism of Metal Removal by Impacting Dust Particles , J. of Basic Eng. (Trans. ASME ), Vol...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006795
EISBN: 978-1-62708-295-2
... 41. Tilly G.P. , Sand Erosion of Metals and Plastics: A Brief Review , Wear , Vol 14 , 1969 , p 241 – 248 10.1016/0043-1648(69)90048-9 42. Bruce R.W. , Development of 1232 °C (2250 °F) Erosion and Impact Tests for Thermal Barrier Coatings , Tribol. Trans. , Vol 41...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006784
EISBN: 978-1-62708-295-2
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003552
EISBN: 978-1-62708-180-1
... hydrogen. Salt baths operated at approximately 210 °C (410 °F) can be used for descaling titanium alloys, superalloys, and refractory metals to avoid the possibility of hydrogen charging associated with pickling. Plating solutions and plating conditions selected to produce a high-cathode efficiency...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
... discontinuities that can be acceptable, if they do not interfere with the utility or service of a part. Laps, seams, bursts, hot tears, and thermal cracks are typically considered to be manufacturing defects. However, whether these manufacturing defects are a contributing factor in an in-service failure is a...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001822
EISBN: 978-1-62708-180-1
... process. These fractures exhibit an outer circumferential zone of irregular detail with evidence of thermal checks and intergranular separation and an inner fracture zone typical of a progressive-type fatigue fracture. In both cases, copper from the bronze-backed journal bearings was absorbed...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
... Connected wrong Foreign material left in General poor workmanship Shock Thermal Mechanical Improper startup Operating Slugs of liquid Process surging Control error Controls deactivated/not installed Operating error Auxiliaries Utility failure Insufficient instrumentation Electronic control failure...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... surface treatments could result in failures, such as the use of cadmium plating on an A286 superalloy fastener subjected to service temperatures above 315 °C (600 °F) (the melting temperature of cadmium is 320 °C, or 610 °F). Two metals specified for use in a wear application could sustain galling if the...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003509
EISBN: 978-1-62708-180-1
... sometimes propagate into the base metal. Transverse cracks in the HAZ (No. 3, Fig. 3 ) occur on the surface in or near the HAZ. They are the result of the high residual stresses induced by thermal cycling during welding. High hardness, excessive restraint, and the presence of hydrogen promote their...