Publications de Roland Logé | EPFL Graph Search

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

Roland Logé, Jamasp Jhabvala, Eric Boillat

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

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

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 ...

Informa UK Limited2025

Solidification pathway induced microstructural differences in austenitic stainless steels produced by L-PBF

Roland Logé, Christian Leinenbach

Informa UK Limited2025

Microstructure and texture evolution in laser Shock Peened martensitic NiTi shape memory alloy

Roland Logé, Cyril Cayron, Junfeng Xiao, Yandong Jing

The Laser Shock Peening (LSP) is commonly used to strengthen the surface of materials. However, the microstructures after LSP impact are complex due to the intense forces involved. In this study, we explore how martensitic microstructures evolve in a half ...

2025

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

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

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

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

A downsized laser powder bed fusion device for operando neutron studies: design and experiments

Roland Logé

This work reports on the development of a downsized laser powder bed fusion device for operando neutron characterization. The design considerations, device configurations, and detailed setup are described. The device is optimized for installations at neutr ...

2025

The role of interaction work in martensite deformation

Roland Logé, Cyril Cayron, Junfeng Xiao

This study elucidates the evolution of martensite deformation via Interaction Work (IW). The IW is the mechanical work done by external loading, assisting deformation by competing with the energy barrier. This interplay establishes the maximum IW (IWmax) c ...

2025

Toward Architected Microstructures Using Advanced Laser Beam Shaping in Laser Powder Bed Fusion of Ti-6al-4v

Roland Logé, Cyril Cayron, Jamasp Jhabvala, Eric Boillat, Mathijs Pieter van der Meer, Junfeng Xiao

Laser Powder Bed Fusion (LPBF) stations mostly use lasers with a Gaussian beam intensity distribution, as it has advantages like small divergence and high ability to be focused. This distribution creates significant thermal gradients leading to high coolin ...

WILEY-V C H VERLAG GMBH2025

Microstructures and outstanding mechanical properties of the 18 carat Au–Ti alloy after age-hardening

Roland Logé, Cyril Cayron

Watchmakers and jewellers are looking for novel 18 carat (ct) gold alloys (75 wt% Au) that combine superior hardness (≥ 300 HV) and scratch resistance with the excellent ductility and machinability characteristic of traditional 18 ct Au–Cu–Ag alloys. The A ...

2025