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Short-time temperin...
Short-time tempering kinetics of quench hardened pearlitic steels
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- Ahlström, Johan, 1969 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Cvetkovski, Krste, 1983 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Karlsson, Birger, 1941 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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visa fler...
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Siller, Ingo (författare)
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visa färre...
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(creator_code:org_t)
- 2010
- 2010
- Engelska.
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Ingår i: Conference proceedings ICTPMCS-2010, 31 May – 2 June 2010, Shanghai, China. ; , s. 6 pp-
- Relaterad länk:
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https://research.cha...
Abstract
Ämnesord
Stäng
- In many industrial processes such as welding, and operating environments like railway wheel/rail contact, certain material volumes are exposed to very short temperature pulses that endure for times of the order of 1 s or shorter. When pearlitic steel is exposed to temperatures above the effective austenitisation temperature, martensite forms upon rapid cooling. In the current work tempering of a martensitic carbon steel was performed, with a laser heat source to create short time top-hat temperature pulses, and also with conventional salt bath experiments for longer tempering times. Temperatures were varied in the range of 500 to 700°C, and times between 0.05 to 3000 s. It was found that the martensitic test samples showed a very rapid initial softening upon tempering. During the first 0.1 second the hardness decrease was measured to 35-55% in the tested temperature range. Thereafter the additional hardness decrease was limited to ~10-15% of the original hardness, even after 30 min of tempering. Thus the use of time-temperature models for predicting tempering properties, that relies on constant or linear dependence of the activation energy cannot be extrapolated to very short time processes.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
Nyckelord
- Martensitic steel
- Laser heat treatment
- Tempering kinetics
- Hollomon-Jaffe time-temperature parameter
Publikations- och innehållstyp
- kon (ämneskategori)
- ref (ämneskategori)