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Roland Logé

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Related publications (129)

Page 5 of 7

In-situ neutron diffraction revealing microstructure changes during laser powder bed fusion and in-situ laser heat treatments of 316L and 316L-Al1

Roland Logé, Claire Navarre, Shieren Sumarli

The versatility and flexibility in laser-based layer-wise additive manufacturing processes allow for the fabrication of metallic parts with tailorable mechanical properties. Interest in microstructure control during the process has led to varying applicati ...

2025

Tailoring residual stress profile of Selective Laser Melted parts byLaser Shock Peening

Roland Logé, Eric Boillat, Nikola Kalentics

The paper describes a new approach in controlling and tailoring residual stress profile of parts made bySelective Laser Melting (SLM). SLM parts are well known for the high tensile stresses in the as – built statein the surface or subsurface region. These ...

2017

Microstructure and flow stress evolution during hot deformation of 304L austenitic stainless steel in variable thermomechanical conditions

Roland Logé, Ke Huang

Most of industrial hot deformation processes are performed in variable conditions where the strain rate and/or deformation temperature are not constant. In this work, hot compression tests in both constant and varying strain rate conditions were performed ...

Elsevier2018

Formation mechanism and microstructural characteristics of a body-centered cubic phase in 3D printed 316L–CuCrZr multi-material structures, combining laser powder bed fusion with foils

Roland Logé, Cyril Cayron, Jamasp Jhabvala, Seyed Amirmohammad Jamili

Additive manufacturing of 316L/CuCrZr multi-material metallic structures has recently attracted significant attention, due to the ideal combination of structural and thermal/electrical properties. In this work, a unique multi-phase microstructure was produ ...

2025

Strain-induced dissolution of Y-Ti-O nano-oxides in a consolidated ferritic oxide dispersion strengthened (ODS) steel

Roland Logé, Mathijs Pieter van der Meer

The present study shows the influence of severe plastic deformation on highly stable Y-Ti-O nano-oxides present in ferritic ODS alloys used for nuclear applications. An innovative strain path implying alternated compressions was used to deform the material ...

2018

Deconvoluting cracking mechanisms in fusion processing of steel-copper multi-materials via Operando X-ray characterisation

Andaç Özsoy, Roland Logé

This study investigates various cracking mechanisms and their prevalence in fusion processing of steel-copper multi-materials using operando X-ray diffraction and imaging during laser powder-bed fusion (LPBF) of 316L-CuCrZr multi-material. During this inve ...

Taylor & Francis2025

An effective rule for translating optimal selective laser melting processing parameters from one material to another

Roland Logé, Jamasp Jhabvala, Eric Boillat, Hossein Ghasemi Tabasi, Rita Drissi Daoudi, Toni Ivas

Selective Laser Melting (SLM) or Laser Powder Bed Fusion (L-PBF) is the most studied laser-based additive manufacturing process for metals and alloys. One important issue in SLM is the time-consuming identification of a process window leading to quasi full ...

2020

Tailoring mechanical properties and microstructures in laser powder bed fusion of 316 L stainless steel through aluminium alloying and combined ex-situ and in-situ heat treatments

Roland Logé, Cyril Cayron, Claire Navarre, Seyed Amirmohammad Jamili, Maxence Jean Gabriel Buttard

Laser powder bed fusion (LPBF) is a bottom-up manufacturing technique using a high-energy laser to selectively melt metallic alloys, enabling the creation of complex microstructures. While rapid cooling rates and process stochasticity can lead to unpredict ...

2025

Evaluation of the mechanical properties of the heat treated FeCrCuMnNi high entropy alloy

Roland Logé

As cast FeCrCuMnNi high entropy alloys were heat treated at different temperatures and times. Structure and mechanical properties of the heat treated alloy were studied using X-Ray diffraction, tensile test, hardness test and scanning electron microscopy. ...

2019

Mapping Spatial Distribution of Pores in an Additively Manufactured Gold Alloy Using Neutron Microtomography

Roland Logé, Jamasp Jhabvala, Hossein Ghasemi Tabasi

A crucial criterion for the quality of the additively manufactured parts is the porosity content for achieving an acceptable final relative density. In addition, for jewelry applications, visible pores are unacceptable at or in the vicinity of the surface. ...

2021

Partial crystallization in Pd-BMG systems: From understanding structure towards influencing functionality through temperature-time series

Roland Logé

Small quantities of crystalline domains created in an amorphous matrix are seen as an active driver for enhanced properties in bulk metallic glasses (BMGs). We investigated partial crystallization and phase transformations through a series of isotherms at ...

2024

In-situ selective laser heat treatment for microstructural control of additively manufactured Ti-6Al-4V

Roland Logé, Cyril Cayron, Milad Hamidi Nasab, Reza Esmaeilzadeh, Claire Navarre, Charlotte Léopoldine de Formanoir de la Cazerie, Lucas Maximilian Schlenger

As-built Laser Powder Bed Fusion (LPBF) Ti-6Al-4V typically exhibits a fully acicular alpha '-martensite microstructure, and requires post-process heat treatment in order to decompose the martensite and achieve sufficient ductility. In the present study, w ...

Elsevier2023

Healing cracks in selective laser melting by 3D laser shock peening

Roland Logé, Christian Leinenbach, Jamasp Jhabvala, Nikola Kalentics, Navid Sohrabi, Hossein Ghasemi Tabasi

Selective Laser Melting (SLM) of Ni-based superalloys such as CM247LC is prone to weld-cracking. This paper investigates how to suppress cracks by repeatedly applying Laser Shock Peening (LSP) during the building phase of SLM. Samples made of CM247LC were ...

ELSEVIER2019

Development of a level set methodology to simulate grain growth in the presence of real secondary phase particles and stored energy – Application to a nickel-base superalloy

Roland Logé

The influence of secondary phase particles on grain growth (Zener pinning) is simulated in two dimensions using a level set method. Several simulations with circular particles are performed to study the influence of particle surface fraction and distributi ...

Elsevier2014

A parametric neutron Bragg edge imaging study of additively manufactured samples treated by laser shock peening

Roland Logé, Christian Leinenbach, Nikola Kalentics

Laser powder bed fusion is an additive manufacturing technique extensively used for the production of metallic components. Despite this process has reached a status at which parts are produced with mechanical properties comparable to those from conventiona ...

Nature Portfolio2021

Dislocation Hardening in a New Manufacturing Route of Ferritic Oxide Dispersion-Strengthened Fe-14Cr Cladding Tube

Roland Logé

The microstructure evolution associated with the cold forming sequence of an Fe-14Cr-1W-0.3Ti-0.3Y2O3 grade ferritic stainless steel strengthened by dispersion of nano oxides (ODS) was investigated. The material, initially hot extruded at 1100 degrees C an ...

MDPI2024

Wear behaviour of novel copper alloy as an alternative to copper-beryllium

Roland Logé, Stefano Mischler, Anna Neus Igual Muñoz, Baptiste Thomas Jean Rouxel

Copper beryllium age hardenable alloys (Cu-Be) are widely used and appreciated for combining exceptional mechanical and electrical properties. However, the toxicity of these alloys pushes the scientific community to develop alternative alloys. Cu-Ni-Sn all ...

ELSEVIER SCIENCE SA2023

Avoiding cracks in multi-material printing by combining laser powder bed fusion with metallic foils: Application to Ti6Al4V-AlSi12 structures

Shruti Banait, Roland Logé, Jamasp Jhabvala, Eric Boillat, Seyed Amirmohammad Jamili

Laser powder bed fusion (LPBF) as an additive manufacturing (AM) technology has emerged as a powerful platform for producing multi-material metallic structures. The main drawbacks of using metallic powders for multi-material printing are related to technic ...

2025

Method and device for fabrication of 3d multi - material (composite) parts by selective laser melting combined with laser welding and cutting

Roland Logé, Nikola Kalentics

The method of manufacturing objects made of a first primary material such as ceramic, metallic or polymer materials on at least one workstation by selective laser melting (SLM) comprises the addition of at least a secondary material different from the prim ...

2017

Electron backscatter diffraction study of variant selection during ordering phase transformation in L1(0)-type red gold alloy

Roland Logé, Cyril Cayron, Margaux Nathalie Dominique Larcher

A shape-memory effect is known to appear in red gold alloys with compositions close to Au-Cu. The aim of this paper is to study by electron backscatter diffraction (EBSD) the variant selection in the A1 -> L1(0) transformation occurring under stress, in be ...

INT UNION CRYSTALLOGRAPHY2019