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Discoloration

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001623
EISBN: 978-1-62708-232-7
... Abstract Several glass wool insulation sections from a heat-treat furnace showed visible, but only cosmetic discoloration. EDS showed the presence of silicon, aluminum, and oxygen in the nondiscolored region, and these elements are consistent with glass wool. Relatively high levels of chromium...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c9001627
EISBN: 978-1-62708-222-8
... no stains were noted on any of the other sinks in the stack. The stain was located near one of the pads; however, no discoloration was noted at the pad location. EDS analysis showed the base metal to be austenitic stainless steel, such as type 304. FTIR analysis of the stain revealed carboxylic salts...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001624
EISBN: 978-1-62708-218-1
... Abstract An electronic sensor coil failed continuity testing, indicating that a break was present in the polymer-coated wire. An area of the wire showed a green discoloration and the break in the wire was located in this same region. The discoloration was suspected to be an indicator of what...
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
... Abstract A nickel alloy cylinder plated with chromium along its inner liner, installed in a commercial ice cream freezer, showed gray discoloration along its OD surface. The discolored parts exhibited significantly reduced cooling efficiency as compared with new cylinders. During operation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001626
EISBN: 978-1-62708-235-8
... Abstract A type 17-4PH stainless steel tube exhibited brown discoloration after a pickling operation. EDS analysis of the extracted substance revealed relatively high levels of iron and chromium, along with lower amounts of aluminum, silicon, sulfur, chlorine, calcium, manganese, and nickel...
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Published: 01 June 2019
Fig. 1 Furnace insulation exhibiting a gray discoloration More
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Published: 01 June 2019
Fig. 1 One end of the freezer cylinder. Gray discoloration is evident several inches away from the end (right). More
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Published: 01 June 2019
Fig. 7 Fracture surface of the failed wheel hub showing the brown discoloration or stain area (arrow) More
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Published: 01 June 2019
Fig. 5 Photomacrograph of the test plate which had the same blue discoloration as was observed on the cylinder weldment. More
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Published: 01 December 2019
Fig. 9 SEM image of Rod “A”; note discoloration at top; crack initiated near red arrow More
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Published: 01 December 2019
Fig. 3 ( a ) The as-received inner ring of the ball bearing. ( b ) Discoloration on the ID of the inner ring of the ball bearing More
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Published: 01 December 1993
Fig. 2 Closeup view of first valve, showing damage and discoloration in the pressure relief fitting More
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Published: 01 December 1993
Fig. 4 Pitch control thrust bearing inner race housing. Note the discoloration and wear on the shoulder. 1× More
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Published: 01 June 2019
Fig. 3 Fracture surface showing small semicircular discolored region (arrowed) at fracture origin (Bolt 44) More
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Published: 01 June 2019
Fig. 4 Fracture surface showing two overlapping semicircular discolored regions (arrowed) at fracture origin (Bolt 39) More
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Published: 01 June 2019
Fig. 5 Fracture surface showing three overlapping semicircular discolored regions (arrowed) at fracture origin (Bolt 33) More
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Published: 01 June 2019
Fig. 6 Fracture surface showing numerous overlapping semicircular discolored regions (between arrows) at fracture origin (Bolt 40) More
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Published: 01 June 2019
Fig. 7 Fracture surface showing discrete semicircular discolored regions (arrowed) at fracture origin (Bolt 42) More
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Published: 01 June 2019
Fig. 8 Energy-dispersive spectroscopy of the discolored surface of Fig. 7 More
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Published: 01 June 2019
Fig. 2 Analysis of the extracted deposit from the discolored tube by FTIR revealed the presence of polypropylene and poly(ethylene:propylene). More