Abstract
Simulation of Cyclic Transformations in the Intercritical Range of a 5Mn Steel
Highlights
MethodologyPublication History: Received: March 23, 2015 Accepted: May 05, 2015 Published: May 07, 2015Keywords: Cyclic transformations, Inverse transformation, Medium-Mn steelsMedium-Mn steels constitute the core of the 3rd generation advanced high-strength steels
The phase fraction formed during the inverse transformation is larger at the maximum temperature of the
Cyclic phase transformations were simulated in Fe-0.2C-5Mn steel as well as in Fe-0.2C and Fe-0.2C-0.2Mn steels for comparison
Summary
MethodologyPublication History: Received: March 23, 2015 Accepted: May 05, 2015 Published: May 07, 2015Medium-Mn steels constitute the core of the 3rd generation advanced high-strength steels. The retained austenite fraction and stability depend, on the intercritical annealing temperature and time. Understanding the kinetics of phase transformations during intercritical annealing is a prerequisite towards designing steel compositions and annealing treatments for austenite stabilization. The study of cyclic α→γ and γ→α transformations in the intercritical range has been proposed as a means to investigate the growth kinetics in low-Mn and low-C FeMn-C alloys [13,14]. The second stems from the fact that α→γ and γ→α transformations proceed at different rates isothermally, and, cyclic transformations can provide insight in the growth kinetics. The aim of the work is to describe growth during α→γ and γ→α transformations by monitoring the position and the velocity of the α/γ interface with temperature and time and to quantify specific stages of the transformation such as the “stagnant” and “inverse” stages described in [14]. Solute partitioning between austenite and ferrite during cyclic transformations is under investigation and has not been considered in detail in this work
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