Speaker
Description
Due to their good combination of properties such as strength and hardness, martensitic steels are extensively used in industry and the technological sector since many years. Despite its long history of usage and application, several phenomena observed and processes happening in martensitic steels are insufficiently understood, and hence are open questions in materials science.
When martensitic steels undergo aging at low temperatures, carbon atoms redistribute towards carbon-rich zones altering local carbon concentration and affecting e.g. the hardness of these steels. Despite decades of research, experimental and theoretical studies so far could not fully reveal neither the sequence of structural transformations leading to these carbon-rich transient phases nor their atomic structure formed during martensite tempering. A main goal of this study is to address these problems by using atomistic modelling of carbon atom kinetics, based on Khatchaturyan’s microelasticity theory [1]. The obtained simulation results are compared to experimental observations found in literature (e.g. [2,3] amongst others).
[1] Khachaturyan, A.G.: Theory of Structural Transformation in Solids. John Wiley & Sons Inc., Hoboken, 1983
[2] Lu, W. et al.: Formation of eta carbide in ferrous martensite by room temperature aging. Acta Materialia, 2018
[3] Clarke, A.J. et al.: Perspectives on Quenching and Tempering 4340 Steel. Metall Mater Trans A, 2020
| Speaker Country | France |
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