End-quench hardenability test for gas quenched steels

Landek, Darko and Liščić, Božidar and Filetin, Tomislav and Lübben, Thomas (2011) End-quench hardenability test for gas quenched steels. = End-quench hardenability test for gas quenched steels. Strojarstvo, 53 (1). pp. 33-37. ISSN 0562-1887. Vrsta rada: Original scientific paper. . .

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Hardenability is usually characterized by the Jominy end-quenched test. For steel grades quenched in oil or water this test is enough selective, and for them a good fixed correlation between cooling time from 800 to 500 °C (tt8/5) and the distance from the quenched end can be established. For steel grades of high hardenability, the Jominy test is not enough selective and sensitive. To establish hardenability for these steels a new hardenability testing method with the modified Jominy test specimen has been proposed after initial investigations at Stiftung Institut für Werkstofftechnik at University of Bremen. The proposed method is based on the high pressure gas end-quenching of cylindrical specimen with variations of kind of gas, pressure and its velocity to achieve more gradual decrease of cooling rates along the specimen and to make the hardenability test more selective with a broader range of lower cooling rates. The conducted experiments and the heat transfer simulation of cooling curves at different locations in the endquenched probe gives possibilities for determination of cooling time t8/5 at different distances from the quenched end, for set quenching conditions. In addition, from the conducted end-quenched tests and simulation results, the relation between hardness distribution and the cooling times t8/5 has been established for tested quench conditions.

Item Type: Article (Original scientific paper)
Keywords (Croatian): Cooling curve; Cooling rates; Cooling time; Cylindrical specimens; Gas quenching; Hardenability; Hardness distribution; Heat transfer simulation; High pressure gas; Jominy tests; Quenched steel; Steel grades; Testing method; Models; Phase diagrams; Quenching; Testing; Cooling
Divisions: 1000 Department of Materials
1000 Department of Materials > 1010 Chair of Materials and Tribology
1000 Department of Materials > 1020 Chair of Heat Treatment and Surface Engineering
Indexed in Web of Science: No
Indexed in Current Contents: No
Citations SCOPUS: 1 (21.4.2015.)
Date Deposited: 21 Apr 2015 09:51
Last Modified: 21 Apr 2015 11:44
URI: http://repozitorij.fsb.hr/id/eprint/3834

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