Agnès Fabre

Agnès Fabre
Ecole Nationale Supérieure d'Arts et Métiers | ENSAM · Laboratoire Mécanique, Surfaces, Matériaux et Procédés (MSMP)

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47
Publications
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186
Citations

Publications

Publications (47)
Article
Full-text available
Rough surfaces are in contact locally by the peaks of roughness. At this local scale, the pressure of contact can be sharply superior to the macroscopic pressure. If the roughness is assumed to be a random morphology, a well-established observation in many practical cases, mechanical indicators built from the contact zone are then also random varia...
Article
Full-text available
The effect of the composition of two steels (B and 6MnCr5) on precipitation of undesirable phases (carbides, nitrides and carbonitrides) under thermochemical treatment (low-pressure or vacuum carbonitriding) is investigated. Metallographic and x-ray diffraction studies and thermodynamic computations are performed.
Article
Micropitting is a form of surface fatigue damage that occurs in the gear teeth. It is due to the effect of variation in the mechanical loading in the contact zone between the two teeth, induced especially by flank roughness. In this study, generic roughness profiles were built with geometrical parameters to simulate the contact between two rough su...
Article
This work presents the development of a Low Pressure Carbonitriding treatment (LPCN) on a 16MnCr5 steel grade. A previous experimental study showed that the treatment should begins with a carbon enrichment (ethylene gas was used) followed by a nitrogen enrichment with ammonia and ends with an oil quenching. Thanks to this experimental work, data we...
Conference Paper
Full-text available
In a previous study, the capability of X-ray diffraction technique to qualify damage occurring during friction had been proven [1]. The purpose of this study is to complete this research in order to develop a method to quantify the damage induced by the friction loading.
Article
Full-text available
The present study deals with a microstructural characterisation of a biphasic titanium alloy Ti‐10V‐2Fe‐3Al. The near β titanium alloy is primarily used for high strength applications, such as components for aeronautical industry. The forging process and the heat treatments of Ti‐10V‐2Fe‐3Al induce a complex microstructure, which consists of an equ...
Article
Friction or corrosion behaviour, fatigue lifetime for mechanical components are influenced by their boundary and subsurface properties. The surface integrity is studied on mechanical component in order to improve the service behaviour of them. Roughness is one of the main geometrical properties, which is to be qualified and quantified. Components c...
Article
Effective prediction methods are needed by engineers to design parts used in fatigue conditions. In gears, surface fatigue damage is observed at two scales: pitting and micropitting. These two phenomena occur in response to the variation of the local loading on the contact zone between teeth. The loading is influenced by the shape of the teeth and...
Article
Residual stresses are to be determined to predict mechanical behaviour of vital parts in aircraft. This part constituted by Ti-10V-2Fe-3Al is analysed using x-ray diffraction (XRD). However, the broadening and sometime the disappearance of peaks involve a major difficulty to quantify the strains and the stresses which are close to the surface. In t...
Article
Full-text available
Ti‐10V‐2Fe‐3Al is a biphasic titanium alloy (α+β) used in aeronautical applications for its mechanical properties, such as its yield strength of 1200 MPa and it weighs 40% less than steel. This alloy is particularly useful for vital parts with complex geometry, because of its high forging capability. In order to predict the capability for fatigu...
Article
Most common mechanical applications require parts with specific properties as hard faced features. It is well known that treating parts under suitable atmospheres may improve hardness and strength yield of steels. Heat treatment process and more particularly thermo‐chemical diffusion processes (such as carburizing or its variation: carbonitriding)...
Article
This study presents 3D finite element (FE) simulations of the representative geometry of the shot peening process. As a preamble, a single shot simulation of a spherical particle is extensively analyzed in order to capture the effect of process parameters (velocity, size, shooting angle) on the plastic strain, residual stress profile and surface...
Conference Paper
The originality of the present work consists on the integration of a thermochemical treatment (low pressure carbonitriding) to the sintering stage of Powder Injection Moulding (PIM) manufacturing process. The capability of PIM to mould small precision components will be combined with the interest of surface treatment. The application will be develo...
Conference Paper
L'alliage de titane Ti-10V-2Fe-3Al étudié présente une microstructure biphasée, constituée de nodules de la phase hexagonale alpha-p dite primaire répartis dans un enchevêtrement de phases cubique beta et hexagonale alpha-sec dite secondaire. Les tailles des cristallites sont différentes d'une phase à l'autre. Les traitements thermomécaniques de l'...
Article
The microstructure and corrosion behavior of commercial alloy ZE41 modified by surface laser cladding with Al–Si powder mixture was studied by SEM, TEM, X-ray diffraction and electrochemical methods. The coating is composed of an Al–Mg matrix and dendrite precipitates of Mg2Si. In function of the laser speed, the matrix is formed by a Mg solid solu...
Chapter
In this article, two original studies of the alumina as porous substrate and PLD (pulsed laser deposition) thin films in view of its biomedical and tribological applications are presented. The first biomedical study aimed to evaluate the role of Al2O3 on thin deposited nanostructures. For this purpose, cerium stabilized zirconia doped hydroxyapatit...
Article
Seamless tubes are used for many applications, e.g. in heating, transport gases and fluids, evaporators as well as medical use and as intermediate products for hydroforming and various mechanical applications, where the final dimensions normally are given by some cold drawing steps. The first process step - piercing of the billet, for example by ex...
Conference Paper
Al2O3 coatings, although very thin thickness, can improve the tribological behaviour of steels. Our study aims understanding the influence of micro-structural and mechanical characteristics on the tribological behaviour of samples of 304L stainless steel with Al2O3 coatings obtained by Magnetron Sputtering (MS) and/or Pulsed Laser Deposition (PLD)....
Article
Full-text available
Nitriding is a thermo-chemical treatment to improve fatigue life of steel parts what are exposed to high cyclic loading on and close to the surface like gears for example. During the nitrogen diffusion, the precipitation of nitrides and carbides generates residual stresses and increases the superficial hardness. These residual stresses are function...
Article
The aim of this paper is the residual stress evaluation in dental implants and the improvement of adherence at the metal-ceramic interface. This study is focused on the development of a multi-layer system model of Hydroxyapatite/ TiO2/Ti components. Our aim is to validate new methods of laser ablation deposition and sol-gel, by controlling the resi...
Article
Hydroxyapatite-based ceramics are largely applied as coatings on metallic components of prostheses for inducing osteoblasts apposition and subsequent regrowth. However the ceramics-metal interfaces are often the seat of residual stresses with amplitude primarily depending on the deposition technique and the coating conditions. The amplitude of this...
Article
Nitriding is an hardening thermomechanical treatment generally used to improve fatigue life of steel parts, like gear for example. Another effect of this treatment is generating superficial stress, influenced by nitriding conditions, composition of steel and geometry of the part. This work deals with the effect of shape on the residual stress profi...
Article
Neutron diffraction measurements were used in this study in order to determine the axial stress state in loaded screw from a specific assembly. The knowing of stress gradient is need to qualify a standard gauge used to calibrate the response of in-situ measurements using ultrasonic nondestructive technique. US is well adapted to perform measurement...
Article
Full-text available
Magnesium alloys are widely used in automotive or aeronautic industries in order to reduce weight of structures. Laser welding is, nowadays, competing with the classical processes (MIG, TIG, electron beam) because of the increasing of productivity, welding components size…. Fatigue life of these parts depends on joint behavior, which is conditioned...
Chapter
One of the goals of multi-axis milling for dies and molds is to achieve good accuracy together with an improvement in surface finish, in order to minimize polishing operations, still necessary to obtain the surface finish required by the automotive industry and the plastic injection sector. This present study concerns the multi-axis milling of a sp...
Article
Due to its mechanical properties and low density, the Ti-6Al-4V titanium alloy is used in hip prostheses. But the tribological behavior of Ti-6Al-4V sliding against ultra high molecular weight polyethylene involves wear degradations. The wear behavior of (Ti-6Al-4V/UHMWPE) couple can be improved by ion implantation of nitrogen. After a characteriza...

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