Atomic interactions between Si and Mn during eutectoid transformation in high-carbon pearlitic steel
- 26 December 2019
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 126 (24), 245102
- https://doi.org/10.1063/1.5119185
Abstract
The atomic interactions between Si and Mn during eutectoid transformation in high-carbon pearlitic steel were investigated. Atom probe tomography and first-principles calculations were applied to evaluate and analyze the atomic interactions at the ferrite/cementite interface. In the initial stage of eutectoid transformation, enrichment of Si and Mn occurred at the ferrite and cementite sides, respectively, of the interface. This interfacial segregation phenomenon gradually diminished as the transformation proceeded. Calculations of the cohesive energy and formation energy revealed a clear enhancement in the chemical bonding and stability of the pearlite system when the Si atom was moved from the ferrite layer to the cementite layer and the Mn atom was moved in the opposite direction. The interfacial segregation of the Mn and Si atoms was mainly responsible for the insufficient diffusion and high hybridization degree of Fe, Mn, Si, and C atoms. Furthermore, the partitioning ratio of Mn in high-Si steel was greater than that in low-Si steel, leading to greater partitioning of Mn into the cementite phase. Calculations of the electronic structure revealed that the enrichment of Si in the ferrite phase promoted the partitioning of Mn into the cementite phase owing to the strong repulsive force between Mn and Si at the pearlitic interface.Keywords
Funding Information
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China (51201031)
This publication has 40 references indexed in Scilit:
- Eutectoids with cementite as the major constituent in Fe–C–M alloysActa Materialia, 2016
- Effect of Si and Mn Interactions on the Spheroidization and Coarsening Behavior of Cementite During Annealing in Severe Cold-Drawn Pearlitic SteelMetallurgical and Materials Transactions A, 2015
- The influence of chromium on the pearlite-austenite transformation kinetics of the Fe–Cr–C ternary steelsJournal of Alloys and Compounds, 2015
- Microstructure and mechanical properties of cold-drawn pearlitic wires affect by inherited textureMaterials & Design (1980-2015), 2015
- Deformation of cementite in cold drawn pearlitic steel wireMaterials Science and Engineering: A, 2014
- Effects of alloying elements on the kinetics of austenitization from pearlite in Fe–C–M alloysPhilosophical Magazine, 2013
- Evolution of strength and microstructure during annealing of heavily cold-drawn 6.3 GPa hypereutectoid pearlitic steel wireActa Materialia, 2012
- Effects of Mn, Si and Cr addition on reverse transformation at 1073K from spheroidized cementite structure in Fe–0.6 mass% C alloyActa Materialia, 2010
- Pearlite to austenite transformation in an Fe–2.6Cr–1C alloyActa Materialia, 1999
- Microstructure control of ferrite-pearlite high strength low alloy steels utilizing microalloying additionsJournal of the American Academy of Dermatology, 1995