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diffusion coatings

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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
... coatings that improve performance of superalloy. diffusion gas turbines high-temperature coatings high-temperature corrosion interdiffusion oxidation superalloys WHEN CORROSION FAILURES OCCUR at high temperatures (300 to 1700 °C, or 570 to 3090 °F), the unscheduled outages result in loss...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001066
EISBN: 978-1-62708-214-3
...-Corrosion Cracking , Failure Analysis and Prevention , Vol 11 , ASM Handbook , ASM International , 2002 , p 823 – 860 10.31399/asm.hb.v11.a0003553 Metallographic Examination Material Coatings or Surface Layers Corrosion or Wear Deposits Most Probable Cause Remedial Action...
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
... been applied in 1966, when these coatings were relatively new. It is evident that maintaining the integrity of a protective coating could significantly increase the life of a nickel-base alloy blade operating in a hot and corrosive environment. Corrosion products Diffusion coatings Turbine...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001746
EISBN: 978-1-62708-217-4
...Abstract Abstract Brittle intergranular fracture, typical of a hydrogen-induced delayed failure, caused the failure of an AISI 4340 Cr-Mo-Ni landing gear beam. Corrosion resulting from protective coating damage released nascent hydrogen, which diffused into the steel under the influence...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001099
EISBN: 978-1-62708-214-3
... fasteners and appropriately-applied and treated compatible coatings. Brittle fracture Castings Diffusers Galvanic corrosion Transition joints 356.0 UNS A03560 Hydrogen damage and embrittlement Galvanic corrosion Background Visual Examination of General Physical Features Testing...
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
... (diffusion) coatings and overlay coatings, are applied. Also to reduce the exposure of the superalloys to the highest temperatures in cooled hot parts, a ceramic thermal barrier coating (TBC) is applied. Metals and alloys are known to experience accelerated oxidation when their surfaces are covered...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001638
EISBN: 978-1-62708-228-0
... the furnaces of the unit based on a single failure of this kind. Likewise, although diffusion coatings rich in aluminum are available, it is also not considered practical to coat all the transfer lines in response to a single incident. These coatings could not be applied in situ so this would obviously...
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
... for high-temperature applications. Protective coatings may be higher alloys applied to a lower alloy by cladding or plasma spraying; diffusion coatings, such as nickel, cobalt, or iron aluminides, or overlay coatings, such as iron, cobalt, nickel, or cobalt-nickel Cr-Al-Y or Cr-Al-Hf coatings; or thermal...
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
... in which the oxidation or hot corrosion resistance of the base material is unacceptable ( Ref 16 , 17 ). Two generic coating types are used for blade applications: diffusion coatings and overlay coatings. Both types of coatings result in a surface layer enriched in oxide-forming elements to promote...
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
... coat, and β phases of 721ES were coarser than those of 400ES. Additionally, more aluminum oxides, formed by aluminum diffusion, were observed at the bond-coat/substrate interface of the 721ES samples. Fig. 2 Backscattered images of cross-sectional area of (a) 400 and (b) 721ES. Higher...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001133
EISBN: 978-1-62708-214-3
...Abstract Abstract A femoral knee implant was returned to the casting vendor for analysis after exhibiting poor bond strength between the cast substrate and a sintered porous coating. Both the coating and the substrate were manufactured from a cobalt-chromium-molybdenum alloy. Metallographic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048634
EISBN: 978-1-62708-225-9
... cycle eliminated embrittlement in pins plated with a bright coating that did not allow the escape of mobile hydrogen. Hydrogen embrittlement is caused by the use of a bright, impervious cadmium electroplate that hinders the diffusion of mobile hydrogen outward from the surface of the pin. After...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001679
EISBN: 978-1-62708-229-7
...Mercury Diffusion Pump Stage Information Table 1 Mercury Diffusion Pump Stage Information Name Stage Start Date Examine How Fabricated Pump Position 1988 EB 3 rd 10/88 EB welded — 1988 MP 3 rd 10/88 machined from single block — 1989 EB (cracked) 3 rd 10/89 EB...
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
.... The coating and the diffusion zones between the coating and the matrix were carefully examined to identify any areas containing inherent coating defects or service induced microstructural degradation. With intermetallic coatings in general, corrosion failures based mainly on coating-substrate diffusion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001702
EISBN: 978-1-62708-219-8
... removed, steel rebar sandblasted; some rebar primed with epoxy; other rebar coated with inorganic zinc coating; patch constructed; patch concrete cast around rebar; concrete surface sealed with linseed oil; steel rocker assemblies sand blasted and painted. (Note: no details about the mix design...
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
... usually manifests itself as hydrogen embrittlement in high-strength steels and as hydrogen-induced blistering in low-strength steels. The solubility and diffusivity of hydrogen in steel sharply decrease with lowering temperatures; therefore, when a heavy section of steel containing hydrogen at elevated...
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
... as hydrogen embrittlement in high-strength steels and as hydrogen-induced blistering in low-strength steels. The solubility and diffusivity of hydrogen in steel sharply decrease with lowering temperatures; therefore, when a heavy section of steel containing hydrogen at elevated temperature is rapidly cooled...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001812
EISBN: 978-1-62708-180-1
...-corrosion cracking, hydrogen embrittlement, and liquid-metal embrittlement of bolts and nuts. The article explains the most commonly used protective metal coatings for ferrous metal fasteners. Zinc, cadmium, and aluminum are commonly used for such coatings. The article also illustrates the performance...
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
... Abstract Thermomechanical fatigue (TMF) is the general term given to the material damage accumulation process that occurs with simultaneous changes in temperature and mechanical loading. TMF may couple cyclic inelastic deformation accumulation, temperature-assisted diffusion within the material...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0048674
EISBN: 978-1-62708-222-8
... compressed to clamp onto the framework prior to springback. The heat treatment cycle of the fasteners consisted of austenitizing, quenching, tempering to obtain a tempered martensite microstructure, acid cleaning, zinc electroplating, coating with a clear dichromate and thereafter baking to remove...