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Roland Logé

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Publications associées (133)

An investigation on reorientation and textural evolution in a martensitic NiTi rolled sheet using EBSD

Cyril Cayron, Roland Logé, Junfeng Xiao

Variant reorientation is a ubiquitous phenomenon in shape memory alloys and has a great influence on their texture and mechanical response. In the present study, a martensitic NiTi rolled sheet is investigated by the electron backscattering diffraction (EB ...

PERGAMON-ELSEVIER SCIENCE LTD2022

Persistence of variant selection in red gold alloys

Cyril Cayron, Roland Logé, Margaux Nathalie Dominique Larcher

Recently, a new thermally activated distortion with amplification (TADA) effect has been reported in red gold alloys caused by the A1 -> L1(0) phase transformation. The macroscopic amplification is due to the persistence of variant selection nucleated unde ...

ELSEVIER SCIENCE SA2022

Deep learning-based monitoring of laser powder bed fusion process on variable time-scales using heterogeneous sensing and operando X-ray radiography guidance

Roland Logé, Milad Hamidi Nasab

Harnessing the full potential of the metal-based Laser Powder Bed Fusion process (LPBF) relies heavily on how effectively the overall reliability and stability of the manufactured part can be ensured. To this aim, the recent advances in sensorization and p ...

ELSEVIER2022

Bragg edge tomography characterization of additively manufactured 316L steel

Christian Leinenbach, Roland Logé, Nikola Kalentics, Efthymios Polatidis, Markus Strobl

In this work we perform a neutron Bragg edge tomography of stainless steel 316L additive manufacturing samples, one as built via standard laser powder bed fusion, and one using the novel three-dimensional (3D) laser shock peening technique. First, we consi ...

AMER PHYSICAL SOC2022

Nanotwinning-assisted recrystallization

Roland Logé

Dynamic recrystallization helps to refine grain structures in metals and tune their properties. Confining recrystallization within prior nanoscale twinning provides a path for reaching exceptional grain refinement. ...

NATURE PORTFOLIO2022

Differentiation of materials and laser powder bed fusion processing regimes from airborne acoustic emission combined with machine learning

Rita Drissi Daoudi, Roland Logé, Hossein Ghasemi Tabasi

This study investigates the use of a low cost microphone combined with state-of-the-art machine learning (ML) algorithms as online process monitoring to differentiate various materials and process regimes of Laser-Powder Bed Fusion (LPBF). Three processing ...

TAYLOR & FRANCIS LTD2022

Tailored deformation behavior of 304L stainless steel through control of the crystallographic texture with laser-powder bed fusion

Christian Leinenbach, Roland Logé, Efthymios Polatidis, Markus Strobl

Laser-powder bed fusion (L-PBF) has gained significant research interest, not only for its profound advantage of producing near-net shape complex geometries of metallic parts, but also for the possibility of producing tailored microstructures. Here we expl ...

ELSEVIER SCI LTD2022

Understanding variant selection and texture in additively manufactured red-gold alloys

Eric Boillat, Cyril Cayron, Jamasp Jhabvala, Roland Logé, Hossein Ghasemi Tabasi

Printing gold alloys parts is a challenge due to the high reflectivity and thermal conductivity of these materials. Recent studies show an improvement in printing gold using the Laser Powder Bed Fusion (L-PBF) process; however, the impact of the A1 -> L1(0 ...

PERGAMON-ELSEVIER SCIENCE LTD2022

Neutron Bragg edge imaging for strain characterization in powder bed additive manufacturing environments

Roland Logé

Spatially resolved studies of crystalline structures, e.g. lattice spacings, are enabled by recording the transmitted spectra in neutron Bragg edge imaging. The recorded signals are, however, a result of through-thickness averaging of the probed specimen i ...

ELSEVIER2022

Deep transfer learning of additive manufacturing mechanisms across materials in metal-based laser powder bed fusion process

Rita Drissi Daoudi, Roland Logé

The defective regimes in metal-based Laser Powder Bed Fusion (LPBF) processes can be minimized by deploying in-situ monitoring strategies comprising Machine learning (ML) algorithms and sensing techniques. So far, algorithms trained for monitoring a partic ...

ELSEVIER SCIENCE SA2022

Evolution of deformation twinning mechanisms in magnesium from low to high strain rates

Johann Michler, Cyril Cayron, Amit Sharma, Roland Logé, Manish Jain, Xavier Maeder, Nicolò Maria Della Ventura

We present a systematic investigation of {10 (1) over bar2} extension twinning mechanism in single crystal magnesium micropillars deformed over seven orders of magnitude of strain rate, from 10(-4) to 500 s(-1), revealing how the accommodation of newly for ...

ELSEVIER SCI LTD2022

Direct observation of crack formation mechanisms with operando Laser Powder Bed Fusion X-ray imaging

Eric Boillat, Jamasp Jhabvala, Helena Van Swygenhoven, Roland Logé, Samy Hocine, Hossein Ghasemi Tabasi, Navid Sohrabi

Laser powder bed fusion (L-PBF) is a versatile additive manufacturing process that can print geometrically complex metal parts for a variety of applications. However, poor control of defect formation during processing hampers its widespread industrial adop ...

ELSEVIER2022

Characterization of untransformed ferrite in 10Cr and 12Cr ODS steels

Roland Logé

Two new ferrito-martensitic oxide dispersion strengthened (ODS) steels reinforced with (Y, Ti, O) nanoparticles were elaborated using a high-energy attritor. The milled powder was consolidated by hot extrusion at 1050 degrees C. The two types of ODS steels ...

ELSEVIER SCI LTD2021

Additive Manufacturing of Bulk Metallic Glasses-Process, Challenges and Properties: A Review

Jamasp Jhabvala, Roland Logé, Navid Sohrabi

Bulk Metallic Glasses (BMG) are metallic alloys that have the ability to solidify in an amorphous state. BMGs show enhanced properties, for instance, high hardness, strength, and excellent corrosion and wear resistance. BMGs produced by conventional method ...

MDPI2021

Additive manufacturing of a precious bulk metallic glass

Jamasp Jhabvala, Güven Kurtuldu, Antonia Neels, Roland Logé, Navid Sohrabi, Annapaola Parrilli

For the first time, a high-density amorphous and crack-free bulk metallic glass (BMG) based on a precious metal (PdCuNiP) was produced via additive manufacturing (AM). Laser powder-bed fusion (LPBF) was used for the fabrication of the samples, and led to a ...

2021

Laser treatment systems and methods for in-situ laser shock peening (lsp) treatment of parts during production thereof by a selective laser sintering or melting (sls/slm) process, and additive manufacturing systems and methods implementing the same

Roland Logé, Nikola Kalentics

There is described, in accordance with a first aspect of the invention, a laser treatment system and method for, in particular, imparting beneficial residual stresses into a desired part (P) during production thereof by a Selective Laser Sintering or Melti ...

2021

Design of the third-generation lead-based neutron spallation target for the neutron time-of-flight facility at CERN

Roland Logé, Nicola Colonna, Raffaele Esposito

The neutron time-of-flight (n_TOF) facility at the European Laboratory for Particle Physics (CERN) is a pulsed white-spectrum neutron spallation source producing neutrons for two experimental areas: the Experimental Area 1 (EAR1), located 185 m horizontall ...

2021

Superplastic behavior of a severely deformed Mg-6Gd-3Y-0.5Ag alloy

Cyril Cayron, Roland Logé

An extruded Mg-6Gd3Y-0.5Ag magnesium alloy was processed by the simple shear extrusion (SSE) technique at 553 K for 1, 2, 4 and 6 passes to refine the microstructure. The electron back scattered diffraction (EBSD) analysis was used to investigate the micro ...

ELSEVIER SCIENCE SA2021

Influence of Hf on the heat treatment response of additively manufactured Ni-base superalloy CM247LC

Jamasp Jhabvala, Christian Leinenbach, Roland Logé, Hossein Ghasemi Tabasi, Shreyas Sanjay Joglekar

The influence of Hf on the heat treatment response of a Laser Powder Bed Fusion (L-PBF) fabricated Ni-base superalloy was investigated. A Hf-free version of CM247LC, CM247LC NHf, and CM247LC (similar to 1.4 wt% Hf) were subjected to identical thermal treat ...

ELSEVIER SCIENCE INC2021

Microstructural evolution and superplastic behavior of a fine-grained Mg-Gd-Y-Ag alloy processed by simple shear extrusion

Cyril Cayron, Roland Logé

Two magnesium alloys with the nominal compositions of Mg-6Gd-3Y (GW63) and Mg-6Gd-3Y-1Ag (GW63-1Ag) were hot extruded and then processed by 6 passes of the simple shear extrusion (SSE) process at 553 K. Both SEM and EBSD studies confirmed the mean grain si ...

ELSEVIER SCIENCE SA2021

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