Role of Cerium on Transformation Kinetics and Mechanical Properties of Low Carbon Steels

Kadgaye, Chetan and Hasan, Sk Md and Patra, Sudipta and Ghosh, M and Nath, S K and Karmakar, Anish (2021) Role of Cerium on Transformation Kinetics and Mechanical Properties of Low Carbon Steels. Metallurgical and Materials Transactions A, Online . pp. 1-18.

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The present study has focused on the detailed dilatometric and electron microscopic analysis of the formation of austenite and its decomposition in two Cerium (Ce) modified steels containing 0.6 and 0.03 wt pct Ce. Despite a long incubation time, the austenite formation is very fast in the high-Ce steel (0.6 wt pct Ce) during heating. Whereas, the low-Ce steel (0.03 wt pct Ce) promotes early nucleation of austenite but shows a significant delay in the completion of the transformation. Similar trend has been observed for the decomposition of austenite during cooling; the low-Ce steel shows early start of transformation with a sluggish kinetics. The role of Ce on the overall transformation kinetics of austenite during the heating-cooling cycle has been investigated and discussed from thermodynamic viewpoint and nucleation probability. Engineering stress-strain curves have shown a better combination of strength and ductility in the low-Ce steel compared to the high-Ce one. Coarse and spherical Ce2O3 particles (average dia. similar to 4 mu m) in grain interior along with the brittle and grain boundary elongated Ce-C/Ce-Fe intermetallic phases (length similar to 8 mu m and width similar to 3 mu m) are responsible for the lower strain hardening as well as an early failure of the high-Ce steel. Finally, the microstructure-tensile property correlation has been established using chemical composition and fractographic analysis. (C) The Minerals, Metals & Materials Society and ASM International 2021

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Rare-Earth-Elements; low-Alloy Steel; acicular Ferrite; grain-Size; nucleation Behavior; impact Toughness; phase-Equilibria; C-Mn microstructure; inclusions
Divisions:Material Science and Technology
ID Code:8395
Deposited By:Dr. A K Sahu
Deposited On:29 Jul 2021 10:39
Last Modified:29 Jul 2021 10:39
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