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Decarburizing

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001241
EISBN: 978-1-62708-235-8
... Abstract Decarburization of steel may occur as skin decarburization by gases either wet or containing oxygen, and as a deep ongoing destruction of the material by hydrogen under high pressure. Guidelines are given for recognizing decarburization and determining at what point cracks occurred...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001553
EISBN: 978-1-62708-217-4
... Abstract A connecting rod from a failed engine ruptured in fatigue without evidence of excessive stresses, detonation, overheating, or oil starvation. The origin of the fatigue failure was completely mutilated but decarburization was observed. Significant amounts of decarburization (0.010...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001260
EISBN: 978-1-62708-235-8
... hardening and heat treatment does not present any serious difficulty. Care is still required in processing to avoid decarburization. In an application of track pins for tracked vehicles, bars about 22 mm diam were required in heat treated and centerless-ground condition prior to induction hardening...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048309
EISBN: 978-1-62708-229-7
... Abstract A 75 mm OD x 7.4 mm wall thickness carbon steel boiler tube ruptured. A substantial degree of corrosion on the water-side surface leaving a rough area in the immediate vicinity of the rupture was revealed by visual examination. Decarburization and extensive discontinuous intergranular...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0048257
EISBN: 978-1-62708-217-4
... and it was suggested that it had resulted from surface defects. A decarburized surface layer and subsurface oxidation in the vicinity of pitting were revealed by metallographic examination of the 2% nital etched gear tooth sample. It was concluded that pitting had resulted as a combination of both the defects...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0047817
EISBN: 978-1-62708-233-4
... in the shaft portion at the intersection of a 1.3 cm thick wall and a tapered surface at the bottom of the hole. The fatigue crack was influenced by one-way bending stresses initiated at the inner surface and progressed around the entire inner circumference. A heavily decarburized layer was detected...
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Published: 01 January 2002
Fig. 26 Light micrographs of decarburization observed on cross sections of as-rolled and heat treated AISI 5160H alloy steel spring. (a) Nickel plating on top of scale on an as-rolled specimen. (b) Partial decarburization at the surface of a hardened specimen. (c) Free ferrite and partial More
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Published: 01 January 2002
Fig. 27 Light micrograph showing epsilon martensite at the surface of a decarburized (less than 0.5% C) austenitic manganese steel specimen. Etched with 2% nital/20% sodium metabisulfite More
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Published: 01 June 2019
Fig. 6 Decarburized region at wire fracture, transverse section, etch: picral, 200× More
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Published: 01 June 2019
Fig. 3 Decarburized crack boundary (light zone in Fig. 2 ), etching: nital. 100× More
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Published: 01 June 2019
Fig. 1 Surface decarburization at the inner surface of a high pressure line, made of unalloyed steel. Transverse section, etch: Picral, 100 × More
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Published: 01 June 2019
Fig. 2 Oxide precipitates in the decarburized zone of the pipe according to Fig. 1 . Unetched transverse section. 200 × More
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Published: 01 June 2019
Fig. 3 Surface decarburization at the inner surface of a high pressure line of hydrogen resistant chromium-molybdenum steel 20 CrMo9. Transverse section etch: Nital 100 × More
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Published: 01 June 2019
Fig. 9 Transverse section, etch: Picric acid. Region of surface decarburization. 200 × More
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Published: 01 January 2002
Fig. 72 Micrographs showing different degrees of decarburization. (a) Total decarburization caused by a furnace leak during gas carburizing of AISI 1018 steel. 500×; 1% nital etch. (b) Partially decarburized specimen. 190×. Source: Ref 30 More
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Published: 01 January 2002
Fig. 73 Depth of decarburization of a cold-worked steel in a fluidized bed in air. Source: Ref 30 More
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Published: 30 August 2021
Fig. 60 Fracture initiation is toward the top of the image. Some decarburization is present along the forging surface More
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Published: 30 August 2021
Fig. 61 Opposite side of plate to initiation. More decarburization is present along the forging surface More
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Published: 01 June 2019
Fig. 1 Microstructure of a locking block that contained decarburization. Note the softer surface indicated by the larger Knoop microhardness readings. (200× magnification) More
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Published: 01 June 2019
Fig. 7 Decarburization on the surface of spring leg. Etchant, 2 pct Nital. Magnification 82 times. More