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large grain structure

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Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001270
EISBN: 978-1-62708-215-0
... revealed that areas near the parting line exhibited a large grain structure not present in the forged stock. High-temperature scale was also found in the cracks. It was concluded that the cracks were caused by material being folded over the parting line. The folding occurred because of a mismatch...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047991
EISBN: 978-1-62708-225-9
... austenitized. Displacement of metal on the outer raceway was revealed by elongation of grain structure. It was concluded that the failure of the raceway surface was due to incomplete austenitization caused by the improper heat treatment during flame hardening process. Antennas Austenitizing Bearing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047199
EISBN: 978-1-62708-234-1
... ) quite different from that of either material 1 or 2. For the material 3 forging, the structure on both surfaces was composed of recrystallized grains with no directionality. The microstructure changed from highly deformed grains at the center (micrograph E, Fig. 1 ) to large equiaxed grains near...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001510
EISBN: 978-1-62708-217-4
... Analysis Stereomicroscopic evaluation of the grip's fracture disclosed a flat surface with a wood grain textured appearance over the entire fracture plane. One large fanshaped area was evident radiating circumferentially across one third of the fracture surface of the component, as shown in figure 1...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001082
EISBN: 978-1-62708-214-3
... impeller. The grain size found in castings (especially large castings) is usually many times larger than that found in wrought materials. Therefore, there is a smaller area of grain boundaries in which a given amount of carbide can precipitate and thus a greater concentration of carbide at the grain...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048403
EISBN: 978-1-62708-226-6
..., the fracture surface of the cast cobalt-chromium-molybdenum alloy screw had an erratic structure ( Fig. 3a ), which can be explained by the large grain size and the tendency of the grains to fracture along crystallographic planes. Figure 3(b) shows such fracture planes of differently oriented grains...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001077
EISBN: 978-1-62708-214-3
... martensitic structure ( Fig. 5 ). This microstructural inhomogeneity extended into the carburized case in the form of coarse martensite that still showed the outline of large grains ( Fig. 6 ). Because the microstructural inhomogeneity appeared to extend through the carburized layer toward the coast side...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047187
EISBN: 978-1-62708-225-9
... in peripheral speed. The microstructure at the periphery of a worn tooth at its unworn side ( Fig. 1b ) consisted of coarse acicular martensite with a large percentage of retained austenite. Parts with such a structure usually have a relatively low wear resistance because of low hardness. They are also very...
Image
Published: 01 June 2019
Fig. 6 Examples of some of the microstructures of the failed couplings (transverse, T; longitudinal, L). (c) Coarse α-matrix grains with a fine, spaced lamellar structure κ IIII phase at grain boundaries and a low concentration of κ IIV precipitates at grain interiors. (d) Large α-matrix More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001734
EISBN: 978-1-62708-234-1
... that these features were residual melt in the grain boundaries, which sustained a cold fracture during separation. Fig. 1 As-received actuator—note removal of paint and location of fracture. Fig. 2 Structure in center of fracture contains grains joined by tendrils. Magnification 840 times...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047080
EISBN: 978-1-62708-235-8
... varied from about 3.2 × 9.5 mm (0.125 × 0.375 in.) to a maximum of 1.9 × 5 cm (0.75 × 2 in.). Fig. 1 Failed aluminum alloy 6061-T6 connector tube from a water-cooling system. (a) Macrograph of the tube showing blow out that appears to involve the loss of a single large grain. (b) Structure near...
Image
Published: 01 June 2019
Fig. 1 Failed aluminum alloy 6061-T6 connector tube from a water-cooling system. (a) Macrograph of the tube showing blow out that appears to involve the loss of a single large grain. (b) Structure near the neutral axis of the bend. The huge grain at lower left (light area) occupied almost More
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001026
EISBN: 978-1-62708-214-3
... facility, where it was determined that the fracture was initiated by large, preexisting, transgranular, hydrogen-induced cleavage cracks. These cracks traversed exceptionally large (up to 6.5 mm, or 0.26 in.) prior-austenite grains in both flap supports. The unusual nature of the fracture surface...
Image
Published: 30 August 2021
. The structure shown is adequate, but excessively large grains and inadequate normalizing if sufficient time is not allowed to reach temperature in thicker sections. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001135
EISBN: 978-1-62708-219-8
... structure in this region. Because the interior will be at higher temperatures for longer times during cooling, grain growth can occur in the interior of large pieces. This is especially true if improper working and finishing temperature are used. In order to refine the grain structure and to homogenize...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006816
EISBN: 978-1-62708-329-4
... of the 50 mm (2 in.) thick plate. The structure shown is adequate, but excessively large grains and inadequate normalizing if sufficient time is not allowed to reach temperature in thicker sections. Heating Too Fast Uneven thermal expansion can create thermal stresses during heating as well...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001266
EISBN: 978-1-62708-215-0
... fracture. Metallographic examination of samples revealed an extremely large grain size and corroborated fatigue fracture. Chemical analysis indicated that the material conformed to the requirements for type 316L stainless steel. Substandard-size tensile bars machined from another prosthesis from the same...
Image
Published: 01 December 1992
Fig. 5 Micrograph showing gray-colored deposit. Note large particles and grain-boundary network or film. This structure was observed only in the dark-colored layer at the inside surface of the tubing in Fig. 4 . Unetched. 500×. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001223
EISBN: 978-1-62708-233-4
... of the structure was so strongly affected that numerous grains broke out during polishing. Fig. 3 Unetched polished section taken from → ← in Fig. 1 . 10× Fig. 4 Micrograph of the corrosion zone on the right hand side of Fig. 3 at higher magnification. 50× Spectral analysis revealed...
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
... the micrographs of the failed surface are presented in Figs. 3 – 6 . The macrostructure reveal a cleavage-like brittle fracture with grainy texture, while the micrographs reveal an austenitic structure with large carbides at the grain boundaries as well as in the austenite grains ( Figs. 3 – 5 ). However...