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http://dx.doi.org/10.12656/jksht.2019.32.1.17

Calculation of Jominy Hardenability Curve of Low Alloy Steels from TTT/CCT data  

Jung, Minsu (Heat Treatment R&D Group, Korea Institute of Industrial Technology)
Son, YoonHo (YuJin SMC Co.)
Publication Information
Journal of the Korean Society for Heat Treatment / v.32, no.1, 2019 , pp. 17-28 More about this Journal
Abstract
Jominy hardenability curves of low alloy steel containing less than 5 wt.% of alloying elements in total were calculated by applying Scheil's rule of additivity to pre-calculated isothermal transformation curve. Isothermal transformation curve for each phase in steel was approximated as a simple mathematical equation by using Kirkaldy's approach and all coefficients in the equation were estimated from experimental temperature-time-transformation (TTT) and/or continuous cooling transformation (CCT) data in the literature. Then jominy test with simple boundary conditions was performed in computer by applying the finite difference scheme. The resultant cooling curves at each location along a longitudinal direction of Jominy bar were applied to calculate phase fractions as well as mechanical properties such as micro Vickers hardness. The simulated results were compared with experimental CCT data and Jominy curves in the literature.
Keywords
Jominy hardenability curve; Low alloy steels; Phase transformation; Hardness; Simulation;
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