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cementite

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Published: 01 June 2019
Fig. 22 Showing grain boundary cementite × 1250 More
Image
Published: 01 June 2019
Fig. 23 Fissuring associated with grain boundary cementite × 1250 More
Image
Published: 01 January 2002
Fig. 12 A cracked cementite particle in a cold-rolled low-carbon steel (approximately 0.1% C). A high magnification view of a cracked cementite particle showing multiple cracks and shattering. Courtesy of Richard Holman, University of Tennessee More
Image
Published: 15 January 2021
Fig. 12 Cracked cementite particle in a cold rolled low-carbon steel (approximately 0.1% C). High-magnification view of a cracked cementite particle shows multiple cracks and shattering. Courtesy of R. Holman, University of Tennessee More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001003
EISBN: 978-1-62708-227-3
... flux. The embrittlement was shown to be caused by the flow of corrosion generated hydrogen which converted the cementite to methane which nucleated voids in the steel. A thermodynamic estimate indicated that a small amount of chromium would stabilize the carbides against decomposition by hydrogen...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001186
EISBN: 978-1-62708-234-1
... of the fracture, but they had no effect on the breakage of the wire. Away from the fracture area, the wire had a normal structure of hyperfine lamellar pearlite (sorbite) of a “patented” and cold drawn steel wire. In the vicinity of the fracture, the cementite of the pearlite was partially spheroidized, while...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001037
EISBN: 978-1-62708-214-3
... of cementite, and to a design that had a raised central section of the inner diameter whose fillets were locations of high stress concentration. Rough machining of the inner diameter and an excessively deep case also contributed to failure. A double type of heat treatment after carburizing and change...
Image
Published: 01 January 2002
Fig. 83 Microstructure of the nominal 0.2% C steel. Pearlite is very coarse, with thick cementite plates in some locations, and there is a large amount of free cementite in the grain boundaries. Source: Ref 82 More
Image
Published: 15 January 2021
Fig. 83 Microstructure of the nominal 0.2% C steel. Pearlite is very coarse, with thick cementite plates in some locations, and there is a large amount of free cementite in the grain boundaries. Source: Ref 81 More
Image
Published: 01 June 2019
Fig. 8 Primary grain boundary with precipitates of ledeburite and secondary cementite. Etched in picral. 200 × More
Image
Published: 01 December 1993
Fig. 6 Optical micrograph of section of tube 2.300 mm (11.8 in.) away from fracture area showing ferrite and grain boundary cementite More
Image
Published: 01 December 1992
Fig. 4 Surface structure along a longitudinal axis of specimen 2. The dark matrix is tempered martensite; the light-colored grainboundary network is cementite. Nital etch. 200×. More
Image
Published: 01 December 1993
Fig. 8 (a) Microstructure of galvanized sheet. Longitudinal section. Microstructure consists of pearlite and primary ferrite. Note coarse pearlite and divorced cementite. (b) Higher magnification of Fig. 8 . More
Image
Published: 01 December 2019
Fig. 1 A graphitized medium carbon steel; ( a ) graphite nodule in pearlite, with uniform distribution of cementite particles in pearlite around it; ( b ) same steel overaged—complete graphitization and phases present are ferrite and graphite only More
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001322
EISBN: 978-1-62708-215-0
... almost devoid of pearlite and consisting of ferrite with grain-boundary cementite, Fe 3 C ( Fig. 6 ). Fig. 5 Optical micrograph of section of tube 2 from fracture area showing intergranular cracks and fissuring. Note the decarburized microstructure. Fig. 6 Optical micrograph of section...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001207
EISBN: 978-1-62708-235-8
... in Fig. 6 is free of ferrite, thus approximately eutectoid; the microstructure consists of pearlite and martensite with remnants of austenite. Figure 7 reproduces the microstructure of a location with hyper-eutectoid carbon content. It consists of secondary cementite in the shape of long needles...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001307
EISBN: 978-1-62708-215-0
... to describe this kind of material. The weld metal exhibits a microstructure characteristic of rapid solidification. The white phase is cementite, and its presence is reflected in its high microhardness ( Table 2 ). A somewhat similar microstructure can be found in the ASM Metals Handbook ( Ref 2...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001592
EISBN: 978-1-62708-228-0
.... The metallurgy and heat treatment of the steel are important factors. 11 Both tubing and rod section #3 were heat treated with a fast cooling rate, leading to a soft material with a poorly formed pearlite. The lamellae of cementite in the pearlite were not long and thin to provide good corrosion resistance...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001711
EISBN: 978-1-62708-229-7
... at temperatures ranging between 425 °C and 540 °C. In these conditions, the decomposition of cementite yields graphite, which reduces tensile strength. This effect is a faster strength reduction due to the globulization of carbides. Therefore, steels must include alloying elements with strong carbide-forming...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001531
EISBN: 978-1-62708-231-0
... side d γ and pearlite colony size d ρ on fatigue crack initiation life N i It has been shown in a previous investigation on fully pearlitic steels that the strength is determined by cementite interlamellar spacing, while the toughness and ductility are determined by austenite grain size. Ref...