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J.-P. Immarigeon

Bio: J.-P. Immarigeon is an academic researcher from National Research Council. The author has contributed to research in topics: Welding & Laser beam welding. The author has an hindex of 6, co-authored 6 publications receiving 885 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the recent progress in laser welding of magnesium alloys has been reviewed from different perspectives, such as porosity, cracking, oxide inclusions and loss of alloying elements.

522 citations

Journal ArticleDOI
TL;DR: In this paper, the flow stress behavior of near-α alloy IMI834 was investigated by compression testing under isothermal hot working conditions of varying temperature and strain rates up to a true strain of 0.8.
Abstract: In this work, the flow stress behavior of near-α alloy IMI834 was investigated by compression testing under isothermal hot working conditions of varying temperature (between 950 °C and 1125 °C) and strain rates (between 0.001 s −1 and 1 s −1 ) up to a true strain of 0.8. The flow stress behavior revealed greater flow softening in the α–β region as compared to the β region together with the occurrence of a yield point phenomenon at high strain rates and temperatures above the β-transus. Through examination of the influence of temperature and strain rate on the hot working behavior, it was determined that the experimental flow stress observations could be effectively related to the processing parameters using an Arrhenius-type hyperbolic-sine relationship. Constitutive equations that describe the flow stress as a function of the strain rate and temperature are proposed for isothermal hot working of IMI834 in the β and α–β phase regions.

195 citations

Journal ArticleDOI
TL;DR: In this article, the research and progress in laser welding of wrought aluminum alloys are critically discussed from different perspectives, and the primary objective of the review is to understand the influence of welding processes on joint quality and to build up the science base of laser welding for reliable production of aluminum alloy joints.
Abstract: With the wide application of aluminum alloys in automotive, aerospace, and other industries, laser welding has become a critical joining technique for aluminum alloys. In this review, the research and progress in laser welding of wrought aluminum alloys are critically discussed from different perspectives. The primary objective of the review is to understand the influence of welding processes on joint quality and to build up the science base of laser welding for the reliable production of aluminum alloy joints. Two main types of industrial lasers, carbon dioxide (CO2), and neodymium-doped yttrium aluminum garnet (Nd:YAG), are currently applied but special attention is paid to Nd:YAG laser welding of 5000 and 6000 series alloys in the keyhole (deep penetration) mode. In the preceding article of this review (part I), the laser welding processing parameters, including the laser-, process-, and material-related variables and their effects on welding quality, have been examined. In this part of the review, the...

132 citations

Journal ArticleDOI
TL;DR: In this paper, the main laser welding processing parameters including the laser-, process-, and material-related variables and their effects on weld quality are examined and the main factors that affect welding quality are discussed.
Abstract: With the wide application of Al alloys in automotive, aerospace and other industries, laser welding has become a critical joining technique for aluminum alloys. In this review, the research and progress in laser welding of wrought Al alloys have been critically discussed from different perspectives. The primary objective of this review is to understand the influence of welding processes on joint quality and to build up the science base of laser welding for the reliable production of Al alloy joints. Two main types of industrial lasers, carbon dioxide (CO2) and neodymium-doped yttrium aluminum garnet (Nd:YAG), are currently applied but special attention is paid to Nd:YAG laser welding of 5000 and 6000 series alloys in the keyhole (deep penetration) mode. In this part of the review, the main laser welding processing parameters including the laser-, process-, and material-related variables and their effects on weld quality are examined. In part II of this article in this journal, the metallurgical microstruc...

110 citations

Journal ArticleDOI
TL;DR: In this paper, a continuous wave 4kW Nd:YAG laser system was used to weld 2-mm butt joints of sand-cast ZE41A-T5 magnesium alloys at a power of 2.5kW, welding speed of 6.0m/min, and defocusing distance from − 2 to + 3 ǫmm for the material in machined surface conditions.
Abstract: A continuous wave 4 kW Nd:YAG laser system was used to weld 2-mm butt joints of sand-cast ZE41A-T5 magnesium alloys at a power of 2.5 kW, welding speed of 6.0 m/min, and defocusing distance from − 2 to + 3 mm for the material in the machined surface conditions. It was found that the adjustment of defocusing distance greatly influences the establishment of conduction or keyhole mode welding. Conduction welding is obtained at a power density of 4.0 × 10 5 W/cm 2 . Keyhole welding is reached at a threshold irradiance of 1.5 × 10 6 W/cm 2 . The fusion zone consists of refined equiaxed grains formed through cellular growth in the Zr-containing magnesium alloys. The partially melted zone is rather narrow, only a few grains wide. No grain growth or coarsening but softening is observed in the heat affected zone (HAZ). The weld defects observed include three main types: imperfect shape, cavities, and weld cracks. The mechanisms of their formations are discussed. In addition, the original cast quali...

52 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the state of the art in selective laser sintering/melting (SLS/SLM) processing of aluminium powders is reviewed from different perspectives, including powder metallurgy (P/M), pulsed electric current (PECS), and laser welding of aluminium alloys.

1,172 citations

Journal ArticleDOI
TL;DR: In this paper, the current research status of microstructure, properties and heat treatment of SLM processing aluminum alloys is systematically reviewed respectively and a future outlook is given at the end of this review paper.

642 citations

Journal ArticleDOI
TL;DR: In this paper, the recent progress in laser welding of magnesium alloys has been reviewed from different perspectives, such as porosity, cracking, oxide inclusions and loss of alloying elements.

522 citations

Journal ArticleDOI
TL;DR: A review of the current state of the art for coating technology in gas turbine engine applications with a look towards future needs and directions can be found in this paper, where the authors present a survey of the most common coatings used in a variety of engine component applications.
Abstract: The gas turbine provides one of the hardest environments challenging material systems today. Engine components are subject to rigorous mechanical loading conditions, high temperatures, and corrosive or erosive media. Historically, engine manufacturers have applied protective coatings to increase the durability and field performance of alloys or composites. Field experience as well as the development of processing technologies has led to the evolution of many new and improved coatings systems for a variety of engine component applications. In the fan and compressor areas, erosion-resistant coatings are used to minimize blade wear, antigallant coatings are used for fretting wear of blade root attachments and corrosion-resistant coatings are used for blade and disk materials. In the case of the combustor and turbine areas, diffusion and overlay coatings have been developed for oxidation and/or corrosion resistance and ceramic coatings are used widely as thermal barriers. In this paper, we shall review the current state of the art for coating technology in gas turbine engine applications with a look towards future needs and directions.

434 citations

Journal ArticleDOI
TL;DR: In this paper, a mechanism of pitting corrosion caused by AIMn particles was proposed and the corrosion properties of AZ91D weld material were investigated, and the influence of metallurgical factors, such as alloying elements, microstructure and secondary phases, processing factors such as heat treatment and weld, and environmental factors including temperature, relative humidity, solution pH values and concentration on corrosion were discussed.

393 citations