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Carbide segregation

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Published: 01 June 2019
Fig. 9 EPMA micrographs of typical carbide segregation in failed roll. (a) SE image. (b) BSE image showing atomic number contrast. (c) Cr x-ray dot map. (d) V x-ray dot map. (e) Mo x-ray dot map. (f) W x-ray dot map. (g) Fe x-ray dot map. (h) C x-ray dot map. 2000× More
Image
Published: 01 June 2019
Fig. 10 EDS spectrum of chromium-rich region in alloy carbide segregate More
Image
Published: 01 June 2019
Fig. 11 EDS spectrum of tungsten-rich region in alloy carbide segregate More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001814
EISBN: 978-1-62708-180-1
..., unconsolidated interiors, and carbide segregation and poor carbide morphology are reviewed with illustrations. brittle fracture carbide segregation die failure dies electrical discharge machining failure mechanisms finish grinding heat treatment hot working laps machining mechanical testing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0089429
EISBN: 978-1-62708-223-5
.... It was concluded by the plaintiff's metallurgist that the failed drill was defective as the steel contained nonmetallic inclusions and carbide segregation which made it brittle. It was revealed by the defendant that the twist drill met all specifications of M1 high-speed steel and investigated several other drills...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001655
EISBN: 978-1-62708-220-4
... of the plate and not at the surface. Our final conclusion is that localized carbide segregation in the original plate served as preferential corrosion sites for the bacterial attack which developed chloride-induced pits, or anaerobic-induced pits that resulted in leaking of the tanks. Had the tanks been...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001535
EISBN: 978-1-62708-232-7
.... Carbide segregation Roll failure Sendzimir mill roll Spalling Tempered martensite H13 UNS T20813 Brittle fracture Intergranular fracture 1. Introduction Steel rolls for cold reducing mills may fail in different ways depending upon their quality, type, and service conditions undergone...
Image
Published: 01 June 2019
Fig. 5 Villela-etched roll microstructure showing inhomogeneous carbide distribution in tempered martensite. (a) Carbide segregation at grain boundaries. (b) Massive carbide segregate with skeleton-like appearance. 500× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001182
EISBN: 978-1-62708-218-1
... the scale has flaked off. Furthermore, the rim of the disk was badly damaged by secondary mechanical action. The core of the valve had a very fine austenitic microstructure with precipitations of numerous granular and very fine, mostly rounded carbides and tine segregation bands. A hard alloy facing...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001833
EISBN: 978-1-62708-241-9
... boundaries are chrome-rich (Cr, Fe) 23 O 6 carbides. This analysis demonstrates that service-induced segregation of impurity elements such as phosphorous, tin, and nitrogen at the grain boundary, coupled with the formation of a very thin carbide film at the grain boundary, leads to the development...
Image
Published: 01 June 2019
Fig. 6 Villela-etched roll microstructure showing microcracking across segregated carbide. Matrix is tempered martensite. 500× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001250
EISBN: 978-1-62708-223-5
... to the right side of the picture is a broad segregation band. Here the zone-wise less powerful attack of the etchant is the result of the accumulation of alloying elements as well as of carbides in the segregation bands. The increased concentration of alloying elements makes these bands vulnerable...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089676
EISBN: 978-1-62708-224-2
... a segregated structure of complex carbides (black needlelike phase), (FeMn) 3 C carbides (white-on-white area), and pearlite (gray areas) in an austenite matrix, which accounts for the macrostructure shown in Fig. 1(b) . Figure 1(b) is a macrograph of a polished and nital-etched specimen from the link...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001269
EISBN: 978-1-62708-215-0
...-89. The matrix consisted of tempered martensite with fine spheroidal carbides as well as a coarse cellular carbide network. Localized regions of higher and lower carbon contents resulting from segregation were observed ( Fig. 6 , 7 , 8 ). No visual evidence existed of eutectic melting, retained...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047779
EISBN: 978-1-62708-223-5
... to the double carbides Fe 4 Mo 2 C and Fe 4 Cr 2 C. Microscopic examination of the edge of the fracture surface at 100 and 1000× revealed some nonmetallic oxide-sulfide segregation. Visual examination of the fracture surface revealed both a smooth area and a coarse, granular area (View B, Fig. 1...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003540
EISBN: 978-1-62708-180-1
... the grain boundaries completely; discontinuous films are sufficient. Some common examples of IG embrittlement by films or segregants include: Grain-boundary carbide films in steels Iron nitride grain-boundary films in nitrided steels Temper embrittlement of alloy steels by segregation...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006777
EISBN: 978-1-62708-295-2
.... Some specific situations of IG fracture include: High-carbon steels with a pearlitic microstructure Segregated phosphorus and cementite at prior-austenite grain boundaries in the high-carbon-case microstructures of carburized steels Stress-relief cracking Grain-boundary carbide films due...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001213
EISBN: 978-1-62708-220-4
... from 600 to 750° C and carbides have segregated at the grain boundaries; a process favored by cold work prior to annealing. The presence of such precipitates is indicated in Fig. 8 by the strong shading of the grain boundaries. At higher magnification ( Fig. 9 ) the precipitates themselves become...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0046981
EISBN: 978-1-62708-218-1
... operating temperature in a corrosive environment. When the microstructure near the stem surface was examined, it was apparent that carbide spheroidization had occurred. Also, there was a coarsening of the carbide network within the austenite grains. The microstructure indicated that the underhead region...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001161
EISBN: 978-1-62708-220-4
... from the austenitic region. This is usually not the case after welding. In this case the unstable iron carbide may segregate as a transition phase in a zone immediately adjacent to the seam, since this zone is heated to the highest temperature and cooled at the fastest rate. This unstable phase may...