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

Author:

Li Zhao Dong1,Yang Zhi Gang1,Pan Tao2,Xia Zhi Xin1,Zhang Chi1

Affiliation:

1. Tsinghua University

2. Institute of Structural Materials, Central Iron & Steel Research Institute

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 Ae3temperature 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).

Publisher

Trans Tech Publications, Ltd.

Subject

Condensed Matter Physics,General Materials Science,Atomic and Molecular Physics, and Optics

Reference17 articles.

1. A. Roberts and R.F. Mehl: Trans. ASM Vol. 31 (1943), p.613.

2. C.R. Brooks: Principles of the Austenitization of Steels (Elsevier Applied Science, London 1992).

3. G.R. Speich and A. Szirmae: Trans. TMS-AIME Vol. 245 (1969), p.1063.

4. L.E. Samuels: Light Microscopy of Carbon Steels (ASM International 1999).

5. Z. -D. Li, G. Miyamoto, Z. -G. Yang and T. Fururhara: Scr. Mater. Vol. 60 (2009), p.485.

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