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diffusion coating

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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
... on aero gas turbine engines and provides an overview of aging, diffusion, and interdiffusion phenomena. It also discusses the processes involved in high-temperature coatings that improve performance of superalloy. References References 1. Scharfstein L.R. and Henthrone M. , Testing...
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
...Abstract Abstract A flanged 100 mm (4 in.) diam low-carbon steel spool piece lined with Teflon was removed from a sulfuric acid denitrification system after cracks were observed in the painted coating. Visual and microstructural examination along with SEM fractography revealed scaled iron...
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
... had 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
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 Uncoated high-strength alloy steel cap screws retaining a cast...
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: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001827
EISBN: 978-1-62708-241-9
... corrosion. Therefore, surface protection is required to minimize this effect. To protect and delay the destructive hot corrosion action, special corrosion protective coatings of two types, aluminide or chromium (diffusion) coatings and overlay coatings, are applied. Also to reduce the exposure...
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
... metals and alloys, such as iron, nickel, and cobalt, are β-FeAl, β-NiAl, and β-CoAl, respectively. Diffusion aluminide coatings are typically processed via pack cementation, slurry-diffusion, or chemical vapor deposition ( Ref 58 ). Other processes may include plasma spraying, hot dipping...
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
... 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 formation of a protective oxide layer. However, the protective coatings themselves are subject to degradation under engine operating...
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
... 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-magnification micrographs of top/bond-coat interface...
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
... attachment. One frequently used porous coating consists of several layers of sintered cobalt alloy beads. These beads are typically 0.5 to 0.76 mm (0.020 to 0.030 in.) in diameter and also conform to ASTM F-75 composition requirements. Diffusion bonding occurs by holding the beads in contact...
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
... to which brighteners were added. Bright, impervious coatings increase the possibility of hydrogen embrittlement in steels by forming a barrier to outward hydrogen diffusion from plated parts. An accepted practice for removing hydrogen picked up during plating operations is to bake the cadmium-plated...
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
...Abstract Abstract Several mercury diffusion pump stages in the Tritium Purification process at the Savannah River Site (SRS) have been removed from service for scheduled preventive maintenance. These stages have been examined to determine if failure has occurred. Evidence of fatigue around...
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
... coating can allow damaging amounts of hydrogen to diffuse into the steel. Following good manufacturing practices, in general, including minimization of surface imperfections, appropriate maintenance of forming, heat treating, and plating line equipment, and so on, goes a long way toward minimizing...
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
... in) thick (equivalent to about 0.8 mm ( 1 32 in) loss of metal); steel rocker assemblies badly rusted. September 1969 - first repairs; damaged concrete removed, steel rebar sandblasted; some rebar primed with epoxy; other rebar coated with inorganic zinc coating; patch constructed; patch...
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
.... Fig. 17 Coating degeneration and corrosion attack in MAR-M302 vane along the concave airfoil side. (a) Fine cracking; (b) Subsurface shrinkage porosity; (c) Corrosion product penetration in the subsurface porosity. The coating and the diffusion zones between the coating and the matrix were...
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
... and are closely related to one another. Hydrogen damage 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...
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
... on stress-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...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003551
EISBN: 978-1-62708-180-1
... made of steels). The two primary objectives are to minimize heat losses and to prevent various fluids and solids from coming in direct contact with the outer skin (again, most of the time, made of steels). Unlike thin organic linings and coatings, refractory linings may consist of one or many times...
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
... 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 is depleted of aluminum as a result of aluminum diffusion to surface. Source: Ref...