Jean-Eric Masse

Jean-Eric Masse
Ecole Nationale Supérieure d'Arts et Métiers | ENSAM · Laboratoire Mécanique, Surfaces, Matériaux et Procédés (MSMP)

Associate Professor

About

43
Publications
13,387
Reads
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948
Citations
Additional affiliations
September 2002 - present
Ecole Nationale Supérieure d'Arts et Métiers
Position
  • Professor (Associate)
September 2002 - present
Ecole Nationale Supérieure d'Arts et Métiers
Position
  • Professor (Associate)
Description
  • Materials Science, Physics and Laser Applications

Publications

Publications (43)
Article
In this work, the Yb:YAG laser beam welding of the magnesium alloy AM60 was studied. A laser power of 2 kW and a welding speed of 3.5 m / min give a different welding quality than that obtained by CO2 laser with the same parameters. The metallurgical characterization, by optical microscopy, showed the formation of four distinct zones : base metal (...
Conference Paper
Full-text available
Dissimilar laser beam welding between A5754 Al alloy and AZ31 Mg alloy with the plate thickness of 2 mm was investigated. Complex flow pattern characterized by a large volume of intermetallic compounds Al 12 Mg 17 and Al 3 Mg 2 is formed in the fusion zone. Microhardness measurement of the dissimilar welds presents an uneven distribution due to the...
Article
Full-text available
Recent programs of aircraft design are characterized in terms of materials, by introducing weldable alloys as alternatives to the traditional technique of riveting, open the way to reduce weight and allow cost reductions in production and maintenance. Understanding the influence of various parameters of TIG welding process applied to the alloy 2024...
Article
Full-text available
Structure and properties of laser beam welding zone of dissimilar materials, AZ31 magnesium alloy and A5754 Aluminum alloy, are investigated. The microstructure and quality of the Mg/Al weld were studied by metallography, microhardness, and optical microscopy. Differences in physical and mechanical properties of both materials, magnesium and alumin...
Article
Friction stir welding induces a microstructural evolution and residual stresses that will influence the resulting mechanical properties. Friction stir welds produced from magnesium alloy hot rolled plates were studied. Electron back scattered diffraction was used to determine the texture evolution, residual stresses were analysed using X ray diffra...
Article
AZ31 hot rolled magnesium alloy presents a strong basal texture. Using laser beam welding (LBW) as a joining process induces high temperature gradients leading to major texture changes.Electron back scattered diffraction (EBSD) was used to study the texture evolution, and tensile tests coupled with speckle interferometry were performed to understan...
Article
Full-text available
Le procédé Friction Stir Welding qui peut se traduire en français par friction malaxage a été inventé par le TWI de Cambridge en 1991. La soudure est réalisée par apport de chaleur provoqué par le frottement d'un outil en rotation et mis en pression sur la pièce. Ce procédé intéresse les utilisateurs d'alliages légers car, sans passer par la fusion...
Article
A laser surface melting treatment (LSMT) was performed on a ZE41 Mg-alloy using an excimer KrF laser. The laser-melted layer depth depends on the laser scan speed. The morphology and the microstructure of the laser-melted surface were characterized, thanks to the scanning electron microscopy (SEM). The melted Mg-alloy presented a homogenous distrib...
Article
Full-text available
Magnesium alloys have a 33% lower density than aluminum alloys, whereas they exhibit the same mechanical characteristics. Their application increases in many economic sectors, in particular, in aeronautic and automotive industries. Nevertheless, their assembly with welding techniques still remains to be developed. In this paper, we present a CO2 la...
Article
Full-text available
In this paper, a three-dimensional finite element model is developed to simulate thermal history magnesium-based alloys during laser beam welding. Space–time temperature distributions in weldments are predicted from the beginning of welding to the final cooling. The finite element calculations were performed using Cast3M code with which the heat eq...
Article
Full-text available
A finite element model has been developed to simulate an innovative laser rapid prototyping process. Several numerical developments have been implemented in order to simulate the main steps of the rapid prototyping process: injection, heating, phase change and deposit. The numerical model also takes into account different phenomena: surface tension...
Article
Full-text available
The microstructural study of hot rolled magnesium friction stir and laser beam welds revealed the presence of shear band features starting from the weld edge and propagating in the base metal. These shear bands present a highly twinned microstructure and strain localisation occurs preferentially in this region. This influences the resulting mechani...
Article
The temperature evolution during friction stir welding (FSW) and the resulting residual stresses of AZ31 Mg alloy were studied to get a better understanding of the mechanisms involved in this process. The relationship between the processing parameters, the heat and plastic deformation produced and the resulting microstructure and mechanical propert...
Article
Full-text available
This work was performed as a part of AEROMAG Project"Aeronautica lApplication of Wrought Magnesium" (project N°AST4-CT-2005 -516152) which was supported by the European Union.The authors wish to thank EADS-I W F, Suresnes for Friction Stir Welding,Robert Wimpory of HMI, Berlinand DarrenHughesof ILL,Grenoble for Neutron diffraction investigation.
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...
Article
Full-text available
The challenges of weight reduction in aerospace industry have drawn considerable interest in magnesium alloys technologies. Assessing the efficiency of new joining techniques, as FSW is then required. During FSW, the welding tool motion induces frictional heating and severe plastic deformation. Then, in addition to the microstructure and texture ev...
Conference Paper
Full-text available
Un traitement de refusion en surface par un laser à excimères (KrF) impulsionnel a été réalisé sur l'alliage de magnésium RZ5, afin de cerner l'effet de ce traitement sur le comportement du métal en question vis-à-vis de la corrosion et l'usure superficielles. Une approche expérimentale basée sur la variation contrôlée des grandeurs intervenant dan...
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...
Conference Paper
AZ91 is one of the most widely used magnesium-aluminum-zinc cast alloys. Due to the difficulties of traditional welding techniques for magnesium alloys, such as the high thermal expansion coefficient, the absence of color change with temperature approaching the melting point, the presence of magnesium oxide surface layer, etc., the only manufacturi...
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...
Article
Metallic alloys with a low mass density can be considered to be basic materials in aeronautic and automotive industry. Magnesium alloys have better properties than aluminum alloys in respect of their low density and high resistance to traction. The main problems of magnesium alloy welding are the inflammability, the crack formation and the appearan...
Article
Metallic alloys with a low mass density can be considered to be basic materials in aeronautic and automotive industry. Magnesium alloys have better properties than aluminum alloys in respect of their low density and high resistance to traction. The main problems of magnesium alloy welding are the inflammability, the crack formation and the appearan...
Article
A recent French contribution in the field of surface hardening of steel using concentrated solar energy is presented. Single spot and continuous scanning processes have been investigated in a small-scale solar furnace. Hardened regions of 0.5--1.5 mm in thickness have been obtained on specimens of carbon steel, resulting from the transformation har...
Article
Titanium alloys are widely used in various industrial sectors, especially in aeronautics, due to these specific properties: low density, good corrosion resistance, and fairly good mechanical properties. However, they have low wear and gall resistance. This limits their use in tribological applications. To improve surface properties of titanium allo...
Article
Titanium and its alloys are known for their high specific strength as well as fatigue and corrosion resistance. However, they suffer from poor wear and friction resistance, limiting their use in tribological applications. Nitriding of these materials may be carried out favourably to harden them and thus to improve both wear and friction resistance....
Article
Today surface treatments are very important in the mechanical industry to increase the fatigue life of metal components. In addition to classical treatments such as shot peening, a new process is being developed. The laser shock surface treatment permits the creation of plastic strains and induction of compressive residual stresses in metals. It co...
Article
Full-text available
The injection of point defects into the silicon substrate consecutive to a solid state reaction between nickel and silicon was studied by transmission electron microscopy. By observation and determination of the density and size of interstitial type dislocation loops in the substrate at the different steps of the reaction, we could estimate that on...
Article
Laser shock surface treatment is a recently developed process designed to improve component fatigue life in a manner similar to conventional treatments such as shot peening. Irradiation with a short, intense laser pulse can be used to induce plastic strains and compressive residual stresses in metallic substrates. At laser energy densities above th...

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