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grain orientation

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Image
Published: 01 December 2019
Fig. 4 Etched optical microstructures of the failed 40 mm LCTR (longitudinal section) showing deformed ferrite and pearlite grains oriented in drawing direction. ( a ) 100×. ( b ) 500× More
Image
Published: 01 June 2019
Fig. 5 Orientation and distribution of the columnar grains at the bucket tip shroud More
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...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001124
EISBN: 978-1-62708-214-3
... Cause The unfavorable orientation of the elongated grains at the wire joints probably caused the failure. Orientation of the elongated grains transverse to the wire axes likely led to intergranular corrosion, which provided notches for fatigue crack initiation and propagation at the wire joints...
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
... distributed shearing tongues and dimples Fig. 3 Sheared-off cast cobalt-chromium-molybdenum screw. SEM fractography. (a) Overview of portion of rough fracture surface. (b) Area with fracture planes of three differently oriented grains (single arrow, a). (c) Shearing structures and dimples in grain...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048158
EISBN: 978-1-62708-229-7
... Abstract Several of the springs, made of 1.1 mm diam Inconel X-750 wire and used for tightening the interstage packing ring in a high-pressure turbine, were found broken after approximately seven years of operation. Intergranular cracks about 1.3 mm in depth and oriented at an angle of 45 deg...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048850
EISBN: 978-1-62708-229-7
... of the failed pipe was found to consist of a matrix precipitate array (M23C6) and large s-phase particles in the grain boundaries. A portable grinding tool was used to prepare the surface and followed by swab etching. All material upstream of the boiler stop valve was revealed to have oriented the cracking...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001602
EISBN: 978-1-62708-229-7
... to the thinness of the shroud and its relatively large surface, the extraction of heat (direction of heat flow, temperature gradient, and the rate of solidification) directional solidification process and the formation of columnar grains (which intersect the thickness of the shroud) 2 . The orientation...
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
... precipitates in an oriented grain structure, typical of a 2xxx series aluminum alloy forging. Conclusions and Recommendations The UH-1N Main Rotor Blade Grip failed due to a stress corrosion crack that formed on the internal diameter of the grip beneath an interference fit steel bearing liner...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c0091669
EISBN: 978-1-62708-227-3
... of the crack, is shown in Fig. 1(c) as it appeared before etching and in Fig. 1(d) after etching. The microstructure and longitudinal (axial) grain orientation identified the material of the nuts as bar stock. Discussion Tightening of the nuts resulted in sustained tensile stresses in the material...
Image
Published: 01 June 2019
Fig. 4 SEM fracture-surface analysis of the failed hip prosthesis shown in Fig. 1 . (a) Fracture surface showing three distinct grains labeled A, B, and C. (b) Grain A has a shallow crystallographically oriented fracture structure. (c) Grain B has a crystallographically oriented fracture More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048423
EISBN: 978-1-62708-226-6
... are oriented differently with respect to the propagating crack and therefore exhibit different crystallographic fracture patterns. Grain A ( Fig. 4b ) has a relatively flat texture, but also shows crystallographically oriented structures. Grain B ( Fig. 4c ) is characterized by a staircase pattern. Material...
Image
Published: 01 January 2002
cleavagelike on the basal planes with very small tears between separated basal planes. The various orientations of the grains can be seen by the orientation of basal cracking. In some orientations, cracking is extremely difficult, and, in this case, intergranular separation occurs. Courtesy of Howard Nelson More
Image
Published: 01 June 2019
Fig. 3 Sheared-off cast cobalt-chromium-molybdenum screw. SEM fractography. (a) Overview of portion of rough fracture surface. (b) Area with fracture planes of three differently oriented grains (single arrow, a). (c) Shearing structures and dimples in grain identified by the numeral 1 in (b More
Image
Published: 01 June 2019
Fig. 5 Photomicrograph of the new drain tube. Note small grain size with preferred orientation consistent with cold working. More
Image
Published: 01 December 1993
Fig. 7 Secondary cracking below the plane of the initial crack. The cracks are oriented along grain boundaries aligned with the metal flow produced during forging. Etched in Keller's reagent. 320× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001598
EISBN: 978-1-62708-232-7
... visible across the entire wall thickness; however, in several instances only one grain was observed. A photomicrograph of the new as received drain tube is also shown in Fig. 5 . In comparison to the exposed drain tube, the grain size of this tube was significantly smaller and had a preferred orientation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001394
EISBN: 978-1-62708-234-1
... at temperatures of 80 to 90 deg C (176 to 194 deg F). The fracture was unusual in that it was of a fibrous nature, the fibers-which were orientated radially-were readily detachable. The surface of the spindle adjacent to the fracture had an etched appearance and the mode of cracking in this region suggested...
Image
Published: 01 June 2019
in the grain at the lower right-hand corner. Other fracture features are crystallographically oriented. (d) Microstructure of cross section reveals that plate was made from cold-worked stainless steel of high microcleanliness. 80x More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047105
EISBN: 978-1-62708-225-9
... through the grains ( Fig. 1c ). Mechanical-property analysis revealed that, although the yield strengths were comparable (793 to 834 MPa, or 115 to 121 ksi) in the S-T and L-T orientations shown in Fig. 1(b) , there were significant differences in ductility and fracture toughness between...