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Overheating

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Published: 01 January 2005
Fig. 37 Short-term and rapid overheating of a steel boiler tube (reheater, superheater, or similar—source unknown) resulted in a longitudinal “fish-mouth” rupture. The tube had experienced elevated temperatures (455 to >730 °C, or 850 to >1350 °F) where the metal strength is markedly More
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Published: 01 December 2004
Fig. 19 Dendritic microstructure caused by billet overheating adjacent the typical spheroidal microstructure in an as-formed 356 aluminum alloy component. Sample prepared by polishing to a 1 μm finish on a diamond wheel and etched with a 0.5% HF solution. Courtesy of the Industrial Materials More
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Published: 01 January 1989
Fig. 13 Causes of overheating during machining process attributable to friction and low heat absorption problems More
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Published: 30 August 2021
Fig. 11 Photograph of thin-lip rupture in a boiler tube caused by rapid overheating More
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Published: 30 August 2021
Fig. 39 Microstructural characteristics of overheating. (a) Test fracture and (b) tensile-bar fracture from an overheated forged liner made from AISI H12 tool steel. Original magnification of both: 2×. (c) Micrograph illustrating the very coarse martensitic grain structure due to overheating More
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Published: 30 August 2021
Fig. 10 Example of overheating and burning of forgings (a) black oxide from overheating of copper forging heated to 1023 °C (1875 °F) (b) Burning (black outlines) at grain boundaries of copper forging heated to 1065 °C (1950 °F) More
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Published: 30 August 2021
Fig. 11 Overheated surface on SAE 1045 steel showing excessive grain growth and cracking. Hardness at a depth of 250 μm was HRC 59. Source Ref 7 More
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Published: 01 November 2010
Fig. 18 Degraded laminations resulting from excessive magnetic saturation and overheating due to improper design. Source: Ref 42 More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001822
EISBN: 978-1-62708-180-1
...Abstract Abstract This article provides a background of friction-bearing failures due to overheating. The failures of locomotive axles caused by overheated traction-motor support bearings are discussed. The article also describes liquid-metal embrittlement (LME) in steel. It examines...
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Published: 30 August 2021
Fig. 12 Typical microstructures of carbon steel boiler tube that ruptured as a result of rapid overheating. (a) Elongated grains near rupture resulting from rapid overheating below the recrystallization temperature. (b) Mixed structure near rupture resulting from rapid overheating between Ac 1 More
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Published: 01 January 2005
Fig. 33 The crossfire tube provides the path for a spark to ignite the gas in a gas turbine. The tube is usually located away from direct heat. In this case, some misalignment occurred, and the tube was exposed directly to flame. It overheated and experienced rapid oxidation, compounded More
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Published: 30 August 2021
along the top inside surface. Original magnification: ¾×. (b) Side of flattened tube section showing cracks. Original magnification: 1¼×. (c) High-temperature (370 °C, or 700 °F) tension-test specimens: top, specimen from normally heated tube; bottom, specimen from overheated tube. (d) Normally heated More
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Published: 30 August 2021
Fig. 10 Permanent mold of 4130 steel for centrifugal casting of gray and ductile iron pipe that failed because of localized overheating. The failure was caused by splashing of molten metal at the spigot end. Subsequent overheating resulted in mold-wall spalling and scoring, details of which More
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Published: 01 January 2005
Fig. 2 The area of the same carbon steel pipe system as in Fig. 1 where the heater clips were placed in direct contact with the pipe, without insulation. This caused overheating because the pipe was in direct contact with the steam heater. The combined effect of waterline attack and elevated More
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005888
EISBN: 978-1-62708-167-2
... the four major factors associated with the location and magnitude of subsurface overheating: frequency, refractory, final temperature, and power distribution along the heating line. The article summarizes the pros and cons of using a single power supply. It also reviews the design features of modular...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006824
EISBN: 978-1-62708-329-4
... methods used in the laboratory portion of the failure investigation are mentioned in the failure examples. The topics covered are creep, localized overheating, thermal-mechanical fatigue, high-cycle fatigue, fretting wear, erosive wear, high-temperature oxidation, hot corrosion, liquid metal embrittlement...
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Published: 01 January 2005
temperature for Ni-Ni 3 S 2 eutectic. The thinned tube was attributed to overheating caused by flame impingement by one of the burner flames. Control: Alternative alloys should be considered, including the alloy 800 family and other high-temperature nickel alloys. A better alignment of the flames would More
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Published: 01 January 2005
( Fig. 2 ). Shortly after the system was back in service, acid leaked out from the area that was locally corroded from the acid side due to waterline attack during the downtime, compounded by local overheating in service caused by metal-to-metal contact between the heat-tracer pipe and the steel tube More
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Published: 01 December 2004
Fig. 19 Ferrous P/M specimen cut with the use of a coolant. No evidence of overheating. Nital. 12× More
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Published: 30 August 2021
Fig. 45 Softening and plastification of a cylindrical roller bearing due to gross overheating. Source: Ref 24 More