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Carbide precipitation

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Image
Published: 01 June 2019
Fig. 8 Variation in carbide precipitation (black dots) in delta ferrite, Midland 1 (mod. Murakami's). More
Image
Published: 01 December 1992
Fig. 4 Higher-magnification view of tube surface, showing carbide precipitates inside grains and at grain boundaries, with oxide attack at surface. Etched with Vilella's reagent. 380├Ś. More
Image
Published: 01 December 2019
Fig. 13 Carbide precipitates along the grain boundary between locations 3 and 4 More
Image
Published: 01 December 1993
Fig. 7 Micrograph showing grain boundaries with carbide precipitates and a homogeneous precipitation of gamma phase. inside the grains. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0048616
EISBN: 978-1-62708-217-4
.... Mechanical stresses were induced by tightening of the clamp around the duct, which in effect acted to straighten the bolt. The action of these stresses on the carbides that precipitated in the grain boundaries resulted in fracture of the bolt. Due to the operating temperatures of the duct near the bolt...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0091533
EISBN: 978-1-62708-217-4
... that is less susceptible to intergranular carbide precipitation. Aircraft components Carbide precipitation Clamps Sensitization 19-9 DL UNS S63198 Stress-corrosion cracking The clamp shown in Fig. 1(a) was used for securing the hot air ducting system on fighter aircraft. The strap was 0.8 mm...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001571
EISBN: 978-1-62708-229-7
... on the quantification of changes in both the degree of carbide precipitation and delta ferrite content and shape in the cladding as a function of temperature and time to refine the estimates of the maximum temperatures experienced. Delta ferrite Hot cracking Nuclear power reactors Steel plate Weld cladding...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048400
EISBN: 978-1-62708-226-6
... not to be in compliance with standards (type 304 stainless steel without molybdenum). The screws and washers were found to be made of remelted implant-quality type 316L stainless steel and were intact. Signs of sensitization, characterized by chromium carbide precipitates at the grain boundaries, were revealed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0046991
EISBN: 978-1-62708-234-1
... of the weld. Metallographic examination showed that cracking was intergranular and that adjacent grain boundaries had undergone deep intergranular attack. Examination at higher magnification revealed heavy carbide precipitation, primarily at grain boundaries, indicating that the alloy had been sensitized...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001164
EISBN: 978-1-62708-227-3
... sulfur, mainly from the flue gas, and calcium and chlorine, mainly from the sea water. The gray corrosion product was interspersed with rust and a black carbonaceous deposit. Corrosion pitting and poor weld penetration, with carbide precipitation and heavy etching at grain boundaries, indicated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001401
EISBN: 978-1-62708-220-4
... to the weld or a short distance from it and on alternate sides. Microscopical examination did not reveal any intergranular carbide precipitation, such as is well known to result in the weld-decay mode of failure. It was concluded that the primary cause of failure was stress-corrosion cracking arising from...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001403
EISBN: 978-1-62708-220-4
... that the material was an austenitic stainless steel of the type specified but the absence of columbium and titanium in significant amounts shows that it was not stabilised against intergranular carbide precipitation, which might lead to intercrystalline corrosion cracking in service should the material be exposed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001568
EISBN: 978-1-62708-230-3
... oriented along the roll length and primarily at the roll inside surface. Field metallographic examination showed significant grain boundary chromium-carbide precipitation and intergranular corrosion. The roll failures were attributed to chromium depletion along the grain boundaries (sensitization...
Image
Published: 01 December 2019
Fig. 6 SE micrographs showing ( a ) transgranular cracking, ( b ) transgranular cracks along carbide precipitates, ( c ) Cr-carbide precipitation at grain boundaries and slip planes, ( d ) carbides at grain and twin boundaries, and ( e ) EDS results of Cr carbides More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001776
EISBN: 978-1-62708-241-9
... surface showing cleavage of brittle fracture Fig. 3 SEM micrograph of fractured surface showing precipitation of carbides in the austenite matrix and the formation of microcracks Fig. 4 Optical micrograph of failed crusher jaw showing large carbide deposits at grain boundaries...
Image
Published: 01 December 2019
Fig. 4 ( a ) Optical microstructure shows continuous grain boundary and blocky carbide precipitated in matrix. ( b ) SEM image of microstructure. ( c , d ) The EDS analysis of chemical composition of carbide and matrix marked 1 and 2 on ( b ), respectively More
Image
Published: 01 June 2019
with Murakami's reagent to reveal substantial grain-boundary carbide precipitation More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001771
EISBN: 978-1-62708-241-9
... carbide in grain boundary. ( b ) SEM image reveal grain boundary morphology. ( c , d ) the EDS analysis of chemical composition of carbide and matrix marked 1 and 2 on ( b ), respectively Fig. 4 ( a ) Optical microstructure shows continuous grain boundary and blocky carbide precipitated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001171
EISBN: 978-1-62708-219-8
... pipelines, lead to the conclusion that intercrystalline corrosion in steels involved precipitation of a surplus phase at grain boundaries. Intercrystalline corrosion in austenitic stainless steels due to precipitation of chromium carbides during conditions generated due to welding and ways to avoid...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046252
EISBN: 978-1-62708-229-7
.... Large particles, probably niobium carbides (NbC) and complex carbonitrides (NbC,N), were randomly dispersed through the structure. These particles were believed to have been present in the as-received material. Fine carbide precipitates noted in the pipe structures were not detrimental, because...