By P. Hodgeson
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Extra info for Quenching and carburising
Sample text
1 Cooling rate at a certain temperature or temperature interval A simple approach in trying to correlate hardening response with the cooling process is to consider the cooling rate at some selected temperature or cooling time in some temperature range. There is general agreement between researchers that a high cooling rate in the temperature region, where the time to transformation to ferrite, perlite and bainite is shortest, is of decisive importance for the hardness and microstructure after hardening.
Therefore, choice of probe material and size as well as type and position of the thermocouple have to be a compromise between sensitivity, manufacturing costs and probe life. Cooling curve testing is now the subject of international standardisation and various national standards exist (see below). Equipment for testing, both stationary for laboratory use and portable for testing in the workshop, is available commercially. J ~ ~! ) o t:~ ~ ta: CQ) 0 U 0- c: Q. , ::;) Om .. II .. ~CL o)i u>:) zoI 3u~I!
Tensi, Th. Kunzel and P. Stitzelberger: Hiirterei-Tech. , 1987,42, 125-132. 45. S. Segerberg and J. Bodin, in Proc. 3rd International Seminar: Quenching and Carburising, Melbourne, 2-5 Sept. 1991, Institute of Metals & Materials Australasia Ltd. Parkville Vic 3052, Australia. 46. S. Segerberg: IVF-resultat 88605, Severiges Mekanforbund, Stockholm, 1988. 3 Quench Severity Effects on the Properties of Selected Steel Alloys CHARLES E. BATES1*, GEORGE E. TOTTEN2t and KIMBERLEY B. , Tarrytown, New York, USA ABSTRACT Quenching refers to the rapid cooling of metal parts from the solution-treating temperature, typically from 845 to 870°C (1550 to 1600°F) for steel alloys.
