Gilbert Hénaff
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View article: Effects of Temperature and Hydrogen on Fatigue Properties on 304L
Effects of Temperature and Hydrogen on Fatigue Properties on 304L Open
The design of liquid hydrogen tanks requires a thorough understanding of the factors influencing fatigue crack initiation and propagation at cryogenic temperatures in materials used in hydrogen environments. To gain a more precise understa…
View article: Low Cycle Fatigue of Alloy 690 in the PWR Environment
Low Cycle Fatigue of Alloy 690 in the PWR Environment Open
Environmentally Assisted Fatigue (EAF) is one of the concerns for the extended operation of nuclear power plants. Over time, certain components experience thermal cycling while being exposed to the chemically active environment of Pressuri…
View article: The combined effect of hydrogen and aging conditions on the cyclic behavior of a precipitation-hardened nickel-base superalloy
The combined effect of hydrogen and aging conditions on the cyclic behavior of a precipitation-hardened nickel-base superalloy Open
International audience
View article: Influence of mean stress and pressurized water reactor environment on the fatigue behavior of a 304L austenitic stainless steel
Influence of mean stress and pressurized water reactor environment on the fatigue behavior of a 304L austenitic stainless steel Open
Uniaxial strain‐controlled fatigue tests were carried out on a 304L austenitic stainless‐steel specimens in air at 300°C and in pressurized water reactor (PWR), without or with the application of a mean stress, at different total strain am…
View article: Hydrogen-assisted fatigue crack growth: Pre-charging vs in-situ testing in gaseous environments
Hydrogen-assisted fatigue crack growth: Pre-charging vs in-situ testing in gaseous environments Open
We investigate the implications of conducting hydrogen-assisted fatigue crack growth experiments in a hydrogen gas environment (in-situ hydrogen charging) or in air (following exposure to hydrogen gas). The study is conducted on welded 42C…
View article: Optimization of the Pressure Resistance Welding Process for Nuclear Fuel Cladding Coupling Experimental and Numerical Approaches
Optimization of the Pressure Resistance Welding Process for Nuclear Fuel Cladding Coupling Experimental and Numerical Approaches Open
An approach coupling experimental tests and numerical simulation of the pressure resistance welding (PRW) process is proposed for optimizing fuel cladding welds for the new generation of nuclear reactors. Several experimental welds were pr…
View article: Influence of hydrogen on the fatigue crack growth rate of 42CrMo4 steel welds: a comparison between pre-charge and in-situ testing
Influence of hydrogen on the fatigue crack growth rate of 42CrMo4 steel welds: a comparison between pre-charge and in-situ testing Open
International audience
View article: Effect of As-Built and Ground Surfaces on the Fatigue Properties of AlSi10Mg Alloy Produced by Additive Manufacturing
Effect of As-Built and Ground Surfaces on the Fatigue Properties of AlSi10Mg Alloy Produced by Additive Manufacturing Open
The present work concerns the influence of surface (machined, as-built) on the fatigue resistance of AlSi10Mg produced by a powder-bed laser process. The competition between defects and surface roughness is assessed by using Kitagawa-type …
View article: Aging of γ′ Precipitates at 750 °C in the Nickel-Based Superalloy AD730TM: A Thermally or Thermo-Mechanically Controlled Process?
Aging of γ′ Precipitates at 750 °C in the Nickel-Based Superalloy AD730TM: A Thermally or Thermo-Mechanically Controlled Process? Open
The microstructural stability during aging at 750 °C of the γ/γ′ nickel-based superalloy AD730TM is investigated in this work. Strain-free aging and aging during fatigue tests are conducted, with a focus on the influence of the strain rati…
View article: Interactions between microstructure and fatigue crack growth in αβ titanium alloy
Interactions between microstructure and fatigue crack growth in αβ titanium alloy Open
In a context of optimization of the crack propagation resistance properties in αβ titanium alloys, this work aim to explore interactions between microstructure and deformation at crack tip in lamellar titanium alloy, especially regarding t…
View article: Damage mechanisms and embrittlement kinetics in a β-rich Ti 17 alloy after long term aging
Damage mechanisms and embrittlement kinetics in a β-rich Ti 17 alloy after long term aging Open
The Ti 17 (Ti-5Al-2Sn-2Zr-4Mo-4Cr) alloy is used in the first stages of engine compressors, at temperatures up to 450°C. However, its use in structural parts such as engine pylons is more prospective and raises the question of damage toler…
View article: Identification of Relationships between Heat Treatment and Fatigue Crack Growth of αβ Titanium Alloys
Identification of Relationships between Heat Treatment and Fatigue Crack Growth of αβ Titanium Alloys Open
This study deals with the influence of microstructure on the fatigue crack growth resistance of αβ titanium alloys: Ti-6Al-4V ELI (Extra Low Interstitial) that may compete with the conventional Ti-6Al-4V alloy in the manufacture of high pe…
View article: Influence of Strain Rate and Waveshape on Environmentally-Assisted Cracking during Low-Cycle Fatigue of a 304L Austenitic Stainless Steel in a PWR Water Environment
Influence of Strain Rate and Waveshape on Environmentally-Assisted Cracking during Low-Cycle Fatigue of a 304L Austenitic Stainless Steel in a PWR Water Environment Open
In this paper, the low cycle fatigue resistance of a 304L austenitic stainless steel in a simulated pressurized water reactor (PWR) primary water environment has been investigated by paying a special attention to the interplay between envi…
View article: Initiation and propagation of fatigue cracks from surface imperfections on 304L austenitic stainless steel
Initiation and propagation of fatigue cracks from surface imperfections on 304L austenitic stainless steel Open
Given the stringent requirements of high levels of safety in nuclear components, stakeholders of French nuclear industry must anticipate the presence of residual surface imperfections in these components. Such imperfections could be introd…
View article: Influence of gaseous hydrogen on plastic strain in vicinity of fatigue crack tip in Armco pure iron
Influence of gaseous hydrogen on plastic strain in vicinity of fatigue crack tip in Armco pure iron Open
A multi-scale characterisation of the crack tip plasticity has been investigated in a fatigue crack propagation under gaseous hydrogen at gas pressure of 35 MPa in a commercially pure iron, Armco iron. The dislocation structure beneath a f…
View article: Influence of as-built surface and heat treatment on the fatigue resistance of Additively Layer Manufacturing (ALM) AlSi10Mg alloy.
Influence of as-built surface and heat treatment on the fatigue resistance of Additively Layer Manufacturing (ALM) AlSi10Mg alloy. Open
This work concerns the fatigue resistance of a AlSi10Mg material produced by additive manufacturing, and more precisely the competition between as built manufacturing surface and as-machined surface on the fatigue resistance. Samples were …
View article: Fatigue resistance of selectively laser melted aluminum alloy under T6 heat treatment
Fatigue resistance of selectively laser melted aluminum alloy under T6 heat treatment Open
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