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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0089456
EISBN: 978-1-62708-223-5
... of an unetched longitudinal section taken through the die. The pattern was microscopically revealed after etching with 5 % nital to be due to severe chemical segregation or banding. Considerable variation in the hardness, corresponding to the banded and non-banded regions across the face of the specimen...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0047860
EISBN: 978-1-62708-218-1
... of the main-bearing journals. A crack along the fillet, almost entirely through the web, was observed in one of the main-bearing journals. Numerous coarse segregates, identified as sulfide inclusions, were identified by macroetching the surface during metallographic examination of a section taken through...
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
... Abstract In 1979, during a routine bridge inspection, a fatigue crack was discovered in the top flange plate of one tie girder in a tied arch bridge crossing the Mississippi River. Metallographic analysis indicated a banding or segregation problem in the middle of the plate, where the carbon...
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Published: 01 June 2019
Fig. 4 Low load Vickers hardness test with test load of 500 gf in the segregation region shown in Fig. 3 weaker etch than in Fig. 3 ). 200 × More
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Published: 01 June 2019
Fig. 5 Low load hardness values of the segregation band and neighbouring structure. 200 × More
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Published: 01 June 2019
Fig. 1 A D5 tool steel forging die that failed in service because of segregation. (a) Hardness traverse correlated with the microstructure of the die. (b) Section through one arm of the cross on the recessed die face showing a severely segregated (banded) structure. Etched with 5% nital. (c More
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Published: 01 June 2019
Fig. 7 Gas bubble segregation, longitudinal section, etch: Nital. 100 × More
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Published: 01 June 2019
Fig. 8 Relationship between phosphorus grain boundary segregation and R.T. charpy energy. More
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Published: 01 June 2019
Fig. 7 Micro-shrinkage cavity with carbon segregation (ledeburite). Etched in picral. 50 × More
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Published: 01 June 2019
Fig. 9 EPMA micrographs of typical carbide segregation in failed roll. (a) SE image. (b) BSE image showing atomic number contrast. (c) Cr x-ray dot map. (d) V x-ray dot map. (e) Mo x-ray dot map. (f) W x-ray dot map. (g) Fe x-ray dot map. (h) C x-ray dot map. 2000× More
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Published: 01 December 1993
Fig. 5 SEM micrographs showing segregation of inclusions along edge where failure probably initiated. (a) Back scattered electron image. (b) Secondary electron image More
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Published: 01 December 1992
Fig. 3 Scanning electron micrograph showing lead segregation (indicated by arrows) at grain boundaries. More
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001283
EISBN: 978-1-62708-215-0
... path. Fig. 5 SEM micrograph of the cracked area in Fig. 3 , showing black, segregated particles in the crack path. White particles are normal Cu-Al 2 . constituents. Fig. 6 SEM micrograph of a satisfactorily heat-treated Al-4Cu alloy extruded bar, showing absence of black...
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Published: 01 June 2019
Fig. 6 SEM photomicrograph of the fracture surface of a segregated CVN sample - sample failed entirely by cleavage 75deg. F. More
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Published: 01 June 2019
Fig. 8 Fatigue crack growth rates through the segregated region compared to known growth rate values. More
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Published: 01 June 2019
Fig. 6 Villela-etched roll microstructure showing microcracking across segregated carbide. Matrix is tempered martensite. 500× More
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Published: 01 June 2019
Fig. 10 EDS spectrum of chromium-rich region in alloy carbide segregate More
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Published: 01 June 2019
Fig. 11 EDS spectrum of tungsten-rich region in alloy carbide segregate More
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Published: 01 December 1993
Fig. 5 SEM micrograph of the cracked area in Fig. 3 , showing black, segregated particles in the crack path. White particles are normal Cu-Al 2 . constituents. More
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Published: 01 December 1992
Fig. 4 EDX profile at lead-segregated regions indicated by arrows in Fig. 3 . More