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surface texture

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001596
EISBN: 978-1-62708-225-9
... and axial deflection, greatly increasing the torsional stresses on the spring. To understand the fatigue limits under these test conditions, a bench test was used to establish the fatigue strength of the springs. The bench tests showed that the failed springs had an unacceptable surface texture that reduced...
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
... overstress as the smooth-textured fatigue zone was relatively large compared with the crystalline textured coarse final-fracture zone. The fatigue crack was nucleated by the nonmetallic inclusion that intersected the surface and initiated in the 0.25 mm radius fillet at a change in section due to stress...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0048043
EISBN: 978-1-62708-224-2
... of a sectioned terminal specimen. It was indicated by the holes in the region adjoining the crack and rough texture of the crack surface that a corrosive medium (presumably seawater) had entered the crack from the inner surface of the fitting and coupled with the hairline crack to develop crevice corrosion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001538
EISBN: 978-1-62708-217-4
...Abstract Abstract Examination of a cracked nose landing gear cylinder made of AISI 4340 Cr-Mo-Ni alloy steel proved that the part started to fail on the inside diam. When the nucleus of the stress-corrosion crack was studied in detail, iron oxide was found on the fracture surface. A 6500x...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047541
EISBN: 978-1-62708-217-4
... to the throttle-linkage bar by an assembly-weld deposit made on the rod adjacent to the threaded portion. The fracture surface exhibited a coarse-grain brittle texture with an initiating crack at a thread root. The throttle-arm failed by brittle fracture because of the presence of cracks at the thread roots...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001271
EISBN: 978-1-62708-215-0
... the chipped area on the chamfer and the other from the undamaged area on the chamfer. The shape and texture of the fracture surfaces were typical of spalling. The fracture was conchoidal and exhibited a complete lack of plastic deformation. White etching bands that intersected the face and chamfer were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001628
EISBN: 978-1-62708-234-1
... optical microscopy revealing plating nodules in the nondiscolored area of the cylinder (left). A rougher surface texture is noted in the discolored region (right), along with adherent deposits. Nondestructive X-ray fluorescence (XRF) was also conducted, using a portable analyzer, to compare...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0047312
EISBN: 978-1-62708-224-2
... of decomposition to spheroidization. This suggested that the component had been subjected to a subcritical anneal treatment to promote a ferrite matrix structure. This is an acceptable procedure to achieve the 60-40-18 grade of ductile iron. The profile of the fractured surface exhibited a rough texture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0047312
EISBN: 978-1-62708-224-2
... to promote a ferrite matrix structure. This is an acceptable procedure to achieve the 60-40-18 grade of ductile iron. The profile of the fractured surface exhibited a rough texture that is typically associated with the ductile tensile overload observed using SEM. No evidence was found to indicate...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001368
EISBN: 978-1-62708-215-0
...-magnification views of the surface next to a crater and inside a crater are shown in Fig. 5 . The texture of the surface was not typical of hydrogen embrittlement, as distinct cleavage river markings were not present. The texture of the crater was rough and contained smaller unknown particles, atypical of gas...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048420
EISBN: 978-1-62708-226-6
... in Fig. 1(c) and (d) . In front of this structure is a corrosion pit that is surrounded by a burnished surface texture. The burnished surface may have broken open at this point. Observation of other implant specimens confirms that material layers are smeared over each other during wear and can...
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
... that the precipitation of carbides at the grain boundaries may have occurred because of improper heat treatment, but not because of a deficiency in composition. crusher jaws fracture embrittlement steel grainy surface texture metallographic analysis impact strength ASTM A 128 grade B-4 (austenitic manganese...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001449
EISBN: 978-1-62708-221-1
... in. As depicted in Figure 1 , the fracture was essentially of the brittle type, but regions of a slightly different surface texture, denoting pre-existing cracks, were present adjacent to both fillet welds; these measured 1 1 2 in. long ├Ś 3 16 in. deep. It was apparent from the mode...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001825
EISBN: 978-1-62708-241-9
... away from the header was cut from the tube. The transverse section was bent to open longitudinal cracks in the tube wall. The opened cracks had a rough surface texture with flakes of material extending from the crack surface ( Fig. 5 ). The flakes are consistent with ligaments of material that were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001597
EISBN: 978-1-62708-236-5
... open to reveal the fracture surface features associated with the cracking. Both #2 pins exhibited large, woody textured fracture planes oriented perpendicular to the plane between 12 and 6 o'clock on the pin ( Fig. 6 and 7 ). Fig. 6 Woody textured fracture on Crank #1, pin #2 Fig...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
... introduction in Europe and carburized materials, such as 8620, for roller bearings since the turn of the century in the United States. A commonly accepted minimum surface hardness for most bearing components is 58 HRC. The carburizing grades have a core hardness range of 25 to 45 HRC. At surface-hardness...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001376
EISBN: 978-1-62708-215-0
... 6.4 mm ( 1 4 in.) wide (arrows A). The texture of these bands was smooth, indicating brittle fracture, and covered with a black, adherent scale. These two cracks probably occurred at the same time. Fig. 2 Mating fracture surfaces Second, one of the original cracks extended over...
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
... a zone of heavily deformed grains at the fracture edge. The microstructure and the hardness of the screw corresponded to the standards. Fig. 1 Mechanically forced shearing fracture of type 316LR stainless steel screw. (a) Fracture surface with typical spiral deformation texture. SEM. (b) Close-up...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001316
EISBN: 978-1-62708-215-0
... Overall view of separator 2 All three separators exhibited a dark, tenacious scale on the outside and inside diameter surfaces. All three had a rough-textured surface on the inside diameter, and separator 2 also had a rough outside surface. The amount of rough texturing was least severe...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048139
EISBN: 978-1-62708-225-9
.... The inner surfaces of one unbroken spring and both broken springs had coarse textures and contained tool marks ( Fig. 1d ); the tool marks had been formed during the spring-winding operation. The other unbroken spring had a relatively smooth-textured surface and no tool marks. The microstructure of the wire...