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IMMC

Alvise Miotti Bettanini
PhD student
M.Sc. 2014 at KTH, Royal Institute of Technology
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Main project: Optimisation and design of a modified AISI 410 martensitic stainless steel for automotive structural applications
Funding: APERAM Stainless Steel Europe
Supervisor(s): Laurent Delannay, Pascal Jacques

The automotive industry is constantly looking for new materials for weight reduction and structural efficiency. Martensitic Stainless Steels are good candidates to meet these target performances. However, the effect of harmful microstructure constituents like coarse precipitates and residual ferrite on the mechanical properties is not yet fully understood. First, the relationship between structure and property is unveiled with experimental observations and finite element (FE) models. This translates structures into properties and identifies harmful microstructure constituents that might jeopardize performances. Next, computational thermodynamics is used to identify the best heat treatments to avoid unwanted phases and create microstructures that meet the required properties. The first part of the thesis (the translator model), successfully identified ferrite and carbides as harmful phases. The mechanical strength contrast between martensite and residual ferrite promotes strain partitioning into ferrite, which leads to premature damages nucleation and growth.

IMMC main research direction(s):
Computational science
Processing and characterisation of materials
Solid mechanics

Research group(s): IMAP - MEMA
Collaborations: APERAM Stainless Steel Europe, Mines ParisTech

    

Recent publications

See complete list of publications

Journal Articles


1. Miotti Bettanini, Alvise; Ding, Lipeng; Mithieux, Jean-Denis; Parrens, Coralie; Idrissi, Hosni; Schryvers, Dominique; Delannay, Laurent; Pardoen, Thomas; Jacques, Pascal. Influence of M23C6 dissolution on the kinetics of ferrite to austenite transformation in Fe-11Cr-0.06C stainless steel. In: Materials & Design, Vol. 162, p. 362 - 374 (2019). doi:10.1016/j.matdes.2018.12.005; 10.1016/j.matdes.2018.12.005. http://hdl.handle.net/2078.1/208252

2. Miotti Bettanini, Alvise; Hannard, Florent; Jacques, Pascal; Pardoen, Thomas; Guilleume, Badinier; Mithieux, Jean Denis; Delannay, Laurent. Residual ferrite in martensitic stainless steels: the effect of mechanical strength contrast on ductility. In: Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, Vol. 731, p. 495 - 505 (2018). doi:10.1016/j.msea.2018.06.012. http://hdl.handle.net/2078.1/200086

3. Miotti Bettanini, Alvise; Delannay, Laurent; Jacques, Pascal; Pardoen, Thomas; Badinier, Guillaume; Mithieux, Jean-Denis. Influence of microscopic strain heterogeneity on the formability of martensitic stainless steel. In: AIP Conference Proceedings, Vol. 1896, p. 020010 (2017). doi:10.1063/1.5007967. http://hdl.handle.net/2078.1/188433


Conference Papers


1. Miotti Bettanini, Alvise. Unfolding the effect of residual ferrite on damage and fracture resistance in a martensitic stainless steel for automotive application. http://hdl.handle.net/2078.1/199210

2. Miotti Bettanini, Alvise; Laville, Colin; Mithieux, Jean-Denis; Parrens, Coralie; Jacques, Pascal; Pardoen, Thomas; Delannay, Laurent. Ductile to brittle failure transition under bending deformation of martensitic stainless steels. http://hdl.handle.net/2078.1/214430

3. Miotti Bettanini, Alvise. Austenization stasis in Fe-12Cr-0.1C martensitic stainless steel. http://hdl.handle.net/2078.1/199209

4. Miotti Bettanini, Alvise. Overcoming the Diffusion Bottleneck: Effect of Alloying Elements on Phase Transformations and Carbides Dissolution in Martensitic Stainless Steels. http://hdl.handle.net/2078.1/185573

5. Miotti Bettanini, Alvise; Delannay, Laurent; Jacques, Pascal; Pardoen, Thomas. The Effect of Second Population NbC Carbides on The Shear Localisation in a Nb-Modified AISI 410 Stainless Steel. http://hdl.handle.net/2078.1/182516

6. Miotti Bettanini, Alvise; Delannay, Laurent; Jacques, Pascal; Pardoen, Thomas; Mithieux, Jean-Denis; Badinier, Guillaume. The Role of Chromium Carbides Volume Fraction on Plastic Instability Under Three-Point Bending Test in Martensitic Stainless Steel. http://hdl.handle.net/2078.1/182508

7. Miotti Bettanini, Alvise; Delannay, Laurent; Jacques, Pascal; Pardoen, Thomas. Characterization and Modeling of Ductile Damage Accumulation in Martensitic Stainless Steel. http://hdl.handle.net/2078.1/182512

8. Miotti Bettanini, Alvise; Delannay, Laurent; Jacques, Pascal; Pardoen, Thomas; Badinier, G.; Mithieux, J.-D.. Characterization and modeling of ductile damage accumulation in martensitic stainless steels. In: Book of abstracts, 2015. http://hdl.handle.net/2078.1/173226


Dissertations


1. Miotti Bettanini, Alvise. On the process, structure, property relationship for the optimization of strength and bendability of martensitic stainless steels, prom. : Delannay, Laurent ; Jacques, Pascal, 26/04/2019. http://hdl.handle.net/2078.1/216767