The Effect of Heating Rate on the Microstructure of a Soft-Annealed Medium Carbon Steel

Spyros Papaefthymiou; Constantinos Goulas; Felipe Manuel Castro Cerda; Nico Geerlofs; Roumen Petrov

doi:10.1002/srin.201700158

The Effect of Heating Rate on the Microstructure of a Soft-Annealed Medium Carbon Steel

Spyros Papaefthymiou^*, Constantinos Goulas, Felipe Manuel Castro Cerda, Nico Geerlofs, Roumen Petrov

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

14 Citations (Scopus)

Abstract

A comparative study on the microstructural changes after conventional (20 °C s⁻¹) and ultrafast (300 °C s⁻¹) heating is performed on a medium carbon steel in the soft annealed condition. Continuous-heating dilatometry experiments are carried out. The phase transformations and the volume phase fraction of austenite are determined among other microstructural changes. The microstructure is first observed using Optical Microscopy (OM), further characterized by Scanning (SEM), and detailed analyzed by Transmission Electron Microscopy (TEM). The effect of heating rate on the kinetics of cementite dissolution and austenite formation is rationalized. The experimental results are compared with Dictra calculations, and the possible effects on the kinetics of diffusion-controlled austenite formation are rationalized as well. Metallographic observations indirectly suggest the enhanced nucleation of austenite above A_m.

Original language	English
Article number	1700158
Journal	Steel research international
Volume	88
Issue number	10
Early online date	28 Jul 2017
DOIs	https://doi.org/10.1002/srin.201700158
Publication status	Published - Oct 2017
Externally published	Yes

Keywords

austenite
cementite
dictra
kinetics
massive
ultrafast heating

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10.1002/srin.201700158

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abstract = "A comparative study on the microstructural changes after conventional (20 °C s−1) and ultrafast (300 °C s−1) heating is performed on a medium carbon steel in the soft annealed condition. Continuous-heating dilatometry experiments are carried out. The phase transformations and the volume phase fraction of austenite are determined among other microstructural changes. The microstructure is first observed using Optical Microscopy (OM), further characterized by Scanning (SEM), and detailed analyzed by Transmission Electron Microscopy (TEM). The effect of heating rate on the kinetics of cementite dissolution and austenite formation is rationalized. The experimental results are compared with Dictra calculations, and the possible effects on the kinetics of diffusion-controlled austenite formation are rationalized as well. Metallographic observations indirectly suggest the enhanced nucleation of austenite above Am.",

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AU - Goulas, Constantinos

AU - Castro Cerda, Felipe Manuel

AU - Geerlofs, Nico

AU - Petrov, Roumen

PY - 2017/10

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AB - A comparative study on the microstructural changes after conventional (20 °C s−1) and ultrafast (300 °C s−1) heating is performed on a medium carbon steel in the soft annealed condition. Continuous-heating dilatometry experiments are carried out. The phase transformations and the volume phase fraction of austenite are determined among other microstructural changes. The microstructure is first observed using Optical Microscopy (OM), further characterized by Scanning (SEM), and detailed analyzed by Transmission Electron Microscopy (TEM). The effect of heating rate on the kinetics of cementite dissolution and austenite formation is rationalized. The experimental results are compared with Dictra calculations, and the possible effects on the kinetics of diffusion-controlled austenite formation are rationalized as well. Metallographic observations indirectly suggest the enhanced nucleation of austenite above Am.

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The Effect of Heating Rate on the Microstructure of a Soft-Annealed Medium Carbon Steel

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Keywords

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