Analytical Modeling of Austenite Growth and Phase Evolution during Reverse Transformation from Pearlite in High Carbon Steels

Abstract:

Based on an analytical one-dimensional model, austenite growth into pearlite lamella and the corresponding phase evolution during isothermal reverse transformation to austenite at 1000-1183 K in Fe-C fully pearlitic steels containing 0.6-1.0 mass% C (in the austenite single phase field of Fe-C phase diagram) were simulated. It was found that the rate of austenite growth into ferrite increases faster with increasing reversion temperature than into cementite. Three types of phase evolution dependent on reversion temperature and carbon content were classified: 1) cementite rather than ferrite disappears first; 2) ferrite and cementite simultaneously disappear; 3) ferrite rather than cementite disappears first. The type of phase evolution in a hypoeutectoid steel heated above its Ae₃ temperature possibly changes in the order of 1), 2) and 3) as the reversion temperature increases. For eutectoid and hypereutectoid steels, the phase evolution during isothermal reversion always obeys the type 3).

• Periodical: Solid State Phenomena (Volumes 172-174)
• Pages: 1201-1206
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.172-174.1201
• Online since: June 2011
• Authors: Zhao Dong Li, Zhi Gang Yang, Tao Pan, Zhi Xin Xia, Chi Zhang
• Keywords: Austenitization, Pearlitic Steel, Phase Transformation

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