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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001723
EISBN: 978-1-62708-221-1
... of the rimming steel tie-bar of the main jib at the lower splice. This permitted the pin to pass through and allowed the jib to fall. Examination subsequently revealed that brittle fracture of two of the corner angles of the tower head assembly had also occurred. Had the tie-bar material been of satisfactory...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001261
EISBN: 978-1-62708-219-8
... Abstract A ceiling in a concrete structure was hung on flat bars with a cross section of 30 x 80 mm. The bars were borne by a slit steel plate and supported by tabs that were welded onto the flat sides. One of the bars fractured during mounting when it was dropped from a height of about 1 m...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047307
EISBN: 978-1-62708-223-5
... Abstract An impact breaker bar showed signs of rapid wear. The nominal composition of this chromium alloy cast iron was Fe-2.75C-0.75Mn-0.5Si-0.5Ni-19.5Cr-1.1Mo. The measured hardness of this bar was 450 to 500 HRB. The desired hardness for this material after air hardening is 600 to 650 HRB...
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
... Abstract During the preproduction stages of forging, an initial batch of 50 mm (2 in.) diam Al-4Cu alloy (L77) extruded bar stock material was found to be cracking randomly. Failure analysis was conducted to determine the metallurgical factors underlying the phenomenon. Microexamination...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001810
EISBN: 978-1-62708-241-9
... Abstract Several torsion bars had failed in a projectile weaving machine and were analyzed to determine the cause. Specimens prepared from the damaged components were subjected to visual inspection, hardness testing, chemical analysis, and metallurgical evaluations. The failed torsion bars had...
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Published: 01 June 2019
Fig. 1 Seam in rolled 4130 steel bar. (a) Overall view of bar showing location of seam (arrow). (b) Closeup of seam. Note the linear characteristics of this flaw. (c) Micrograph showing cross section of the bar. Seam is normal to the surface and filled with oxide. 30x More
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Published: 01 June 2019
Fig. 6 The agitator bar, that fits on the end of the vacuum tube bar, is severely deformed. Two of the mixing plates are still on the bar, both are broken loose of the shaft. More
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Published: 01 December 2019
Fig. 5 Microstructure of bar materials (etched with nital, 500×): ( a ) Bar 1; ( b ) Bar 3 More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001213
EISBN: 978-1-62708-220-4
... Abstract Fragments of screen bars which as structural elements of a condenser had come into contact with cooling water from the mouth of a river were received. The screen bars were made of stainless austenitic Cr-Ni-Mo steel X 5 Cr-Ni-Mo18 10 (Material No. 1.4401). The bars were fractured...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001218
EISBN: 978-1-62708-234-1
... Abstract Screens made of stainless steel X5 Cr-Ni-Mo 18 10 (Material No. 1.4401), which were exposed to cooling water from the mouth of a river, became unserviceable after a few months because of the breaking out of parts of the bars. The multiple fracturing of the screen bars in the brackish...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001131
EISBN: 978-1-62708-214-3
... Abstract Two 25 x 40 mm (1 x 1.5 in.) AISI 4150 hot-rolled steel bars that cracked during heat treatment were examined to determine whether the heat treating procedure had contributed to the failure. Metallographic examination of a cross section taken through the fracture revealed an oxide...
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Published: 01 June 2019
Fig. 1 Appearance of fracture face to jib tie-bar. More
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Published: 01 June 2019
Fig. 2 Appearance of fracture face of second jib tie-bar. More
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Published: 01 June 2019
Fig. 4 Manner of failure of main jib tie-bar More
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Published: 01 June 2019
Fig. 7 Showing Lüders lines associated with yielding at end of tie-bar More
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Published: 01 June 2019
Fig. 9 Showing section through sheared end of tie-bar ×50 More
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Published: 01 June 2019
Fig. 11 Sulphur print indicating that the tie-bar was made From rimming steel More
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Published: 01 June 2019
Fig. 12 Brittle crack in strip from extreme end of tie-bar More
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Published: 01 June 2019
Fig. 5 Longitudinal crack in a hardened and tempered bar of nickel-chromium steel, cross section, etched in nital. 10 × More
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Published: 01 June 2019
Fig. 15 a). Change of the fracture of notched-bar impact specimen of a steel with 0,24% C by hydrogen attack, 2 ×. Initial state. b). Change of the fracture of notched-bar impact specimen of a steel with 0,24% C by hydrogen attack, 2 ×. 100 h, 400° C, 300 atü H 2 . c). Change of the fracture More