Download or read book FORMATION D ALLIAGE DE SURFACE FER CHROME FER NICKEL PAR REFUSION SOUS FAISCEAU LASER written by HASSINA.. DJABI BOUDOUKHA and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LE LASER, UTILISE COMME SOURCE D'ENERGIE, PERMET DE REALISER LA PLUPART DES TRAITEMENTS SUPERFICIELS ENVISAGEABLES. NOTRE ETUDE PORTE SUR LA FORMATION D'ALLIAGES FER-CHROME ET FER-NICKEL OBTENUS PAR FUSION SUPERFICIELLE D'UN ECHANTILLON DE FER PREALABLEMENT REVETU D'UN DEPOT ELECTROLYTIQUE DE NICKEL OU DE CHROME. L'ANALYSE METALLURGIQUE A PERMIS DE DEFINIR LES PARAMETRES DU TRAITEMENT (PUISSANCE LASER, VITESSE DE DEPLACEMENT, EPAISSEUR DE CHROME OU DE NICKEL...) POUR L'OBTENTION D'ALLIAGE HOMOGENE A TENEUR CONTROLEE EN ELEMENT D'ADDITION. DES SURFACES DE PLUSIEURS CM#2 ONT ETE ELABOREES PAR UN TRAITEMENT MULTIPASSES. L'HOMOGENEITE DES ALLIAGES EST PRESENTEE AINSI QUE DES RESULTATS D'ESSAI DE CORROSION EN MILIEU D'ACIDE SULFURIQUE

Download or read book REALISATION D ALLIAGES DE SURFACE SOUS FAISCEAU LASER written by GUO QIANG.. SONG and published by . This book was released on 1995 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: UN RECENSEMENT DES DIFFERENTES ETUDES REALISEES DANS LE DOMAINE DE L'ALLIAGE DE SURFACE PAR LASER, NOUS A TOUT D'ABORD PERMIS DE FAIRE LE LIEN ENTRE LES DIFFERENTES MICROSTRUCTURES RENCONTREES DANS LES ACIERS CONSTITUANT LES OUTILS DE COUPE ET LEURS PROPRIETES MECANIQUES, ENTRE LE CHOIX DES DIVERS MATERIAUX UTILISES EN MODIFICATION DE SURFACE ET LA NATURE DES LIAISONS CHIMIQUES ENTRE PARTICULES D'APPORT ET MATRICES. A LA SUITE DE CE TRAVAIL, NOUS AVONS REALISE, A L'AIDE D'UN LASER CO#2, DES ALLIAGES DE SURFACE EN INJECTANT TROIS TYPES DE POUDRES: DU CARBURE DE TUNGSTENE ENROBE DE NICKEL, DU CARBURE DE BORE, ET UN MELANGE DE CARBURE DE BORE ET DE ZIRCONE, DANS DEUX TYPES DE SUBSTRAT: ACIER RAPIDE M42 ET ACIER 35CD4. CHAQUE COUCHE TRAITEE PAR LASER A ETE CARACTERISEE PAR DES MESURES DE MICRODURETE, DE CONTRAINTES RESIDUELLES, DES OBSERVATIONS METALLOGRAPHIQUES REALISEES AU MICROSCOPE OPTIQUE ET AU MICROSCOPE ELECTRONIQUE AU BALAYAGE, DES ANALYSES DE PHASES PAR DIFFRACTION DE RAYONS X ET PAR SPECTROSCOPIE ELECTRONIQUE AUGER. TROIS SERIES D'ESSAIS ONT ETE EFFECTUEES: A. INJECTION DE CARBURE DE TUNGSTENE ET DE CARBURE DE BORE DANS L'ACIER RAPIDE M42 L'ACIER RAPIDE M42 REFONDU PAR LASER SANS INJECTION DE POUDRE ATTEINT UNE DURETE DE 1000 HV ; UNE INJECTION DE POUDRE DE CARBURE DE TUNGSTENE PERMET, A CONDITION DE MAINTENIR UN DEBIT DE POUDRE INFERIEUR A 3 G/MN, D'OBTENIR APRES REVENU UNE DURETE DE 1200 HV, DUE A LA PRESENCE DE MARTENSITE ET DE CARBURES DE TYPE M#2#3C#6 ET M#1#2C. L'INJECTION DE CARBURE DE BORE DONNE UNE MICROSTRUCTURE PLUS HETEROGENE OU L'ON RENCONTRE DES PHASES DE FER ET FER , DE BORURE DE FER FE#2#3B ET FE#3B, DE CARBURE M#6C ET DU CARBURE DE BORE NON DISSOUS: UN DEBIT DE 0.8 G/MN A PERMIS D'OBTENIR DES VALEURS DE DURETE COMPRISES ENTRE 1300 HV ET 1900 HV DANS LA ZONE FONDUE. B. INJECTION DE CARBURE DE BORE DANS L'ACIER 35CD4 L'ACIER 35CD4 REFONDU PAR LASER A UNE DURETE DE 800 HV DUE A LA MARTENSITE ET NE PRESENTE NI FISSURE NI POROSITE. L'INJECTION DE CARBURE DE BORE AVEC DEBIT DE POUDRE OPTIMISE PERMET L'OBTENTION D'UN CORDON NON POREUX ET SANS FISSURE A CONDITION DE PRECHAUFFER PREALABLEMENT: DANS CE CAS, LA DURETE VARIANT DE 1400 A 1800 HV EST DUE A UNE STRUCTURE TRES FINE ET HOMOGENE OU LE CARBURE DE BORE BIEN DISSOUS PERMET LA DIFFUSION DU BORE ET DU CARBONE AINSI QUE LA FORMATION DE BORURE DE FER FE#2B (1800 HV) ET D'EUTECTIQUES TRES FINS. L'ACIER 35CD4 TRAITE PAR LASER VOIT AINSI SES PROPRIETES DE SURFACE REJOINDRE CELLES DES ACIERS RAPIDES PLUS CHERS ET GENERALEMENT PLUS PERFORMANTS. C. INJECTION D'UN MELANGE B#4C ET ZIRCONE ZRO#2 DANS L'ACIER 35CD4 LE BUT DE CETTE INJECTION EST D'OPTIMISER LES CONDITIONS OPERATOIRES RENCONTREES AVEC LE B#4C SEUL EN UTILISANT DE LA ZIRCONE PERMETTANT DE SUPPRIMER L'ETAPE DE PRECHAUFFAGE INDISPENSABLE A LA DISPARITION DES FISSURES: EN EFFET ZRO#2 INTRODUIT DES CONTRAINTES EN COMPRESSION DANS LA ZONE FONDUE QUI PERMET DE REFERMER LES FISSURES. ZRO#2 SE TROUVE ALORS A L'ETAT DE PHASE TETRAGONALE INSTABLE A L'INTERIEUR DE LA ZONE FONDUE QUI PRESENTE UNE DURETE CONSTANTE DE 1400 HV SUR UNE PROFONDEUR DE 1.8 MM. DES ALLIAGES DE SURFACE REMARQUABLES PAR LEUR DURETE ET LEURS PROPRIETES MECANIQUES ONT AINSI ETE REALISES PAR INJECTION DE CARBURE DE BORE ET OXYDE DE ZIRCONIUM ; LEUR MICROSTRUCTURE, TRES REPRODUCTIBLE DANS LES CONDITIONS EXPERIMENTALES UTILISEES, NE PRESENTE NI FISSURE NI POROSITE. LEUR UTILISATION DEVRAIT PRESENTER UN INTERET ECONOMIQUE CERTAIN DANS LE DOMAINE INDUSTRIEL. MAIS SURTOUT, D'UN POINT DE VUE THEORIQUE, CETTE ETUDE NOUS A PERMIS D'ETABLIR LE ROLE STABILISANT JOUE PAR L'OXYDE DE ZIRCONIUM AU NIVEAU DE LA REPARTITION DES CONTRAINTES OCCASIONNEES PAR L'INTRODUCTION DE PARTICULES DURES DANS UN SUBSTRAT SOUS FAISCEAU LASER ET DE PRECISER AINSI LES DIFFERENTS MECANISMES QUI ENTRENT EN JEU LORS DE LA SOLIDIFICATION DE TELS ALLIAGES

Download or read book Etude d alliages de surface contenant du nickel labor s par irradiation laser de pr rev tements sur substrat fer written by Annie Hugon and published by . This book was released on 1990 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES ALLIAGES DE SURFACE, ET EN PARTICULIER CEUX ELABORES SOUS FAISCEAU LASER, SONT DE BONS CANDIDATS POUR REMPLACER LES REVETEMENTS CLASSIQUES DANS LA LUTTE CONTRE L'USURE ET/OU LA CORROSION. DANS CE TRAVAIL, NOUS AVONS ELABORE ET CARACTERISE DE TELS ALLIAGES EN NOUS INTERESSANT PARTICULIEREMENT A CEUX CONTENANT DU NICKEL. LA PREMIERE SOLUTION ENVISAGEE A CONSISTE A IRRADIER DES DEPOTS DE NICKEL CHIMIQUE AUTOCATALYTIQUE NI-P SUR FER. LES ALLIAGES DE SURFACE OBTENUS PAR PASSAGE A L'ETAT LIQUIDE ET SOLIDIFICATION RAPIDE SONT CARACTERISES DU POINT DE VUE PHYSICOCHIMIQUE ET MICROSTRUCTURAL. CETTE CARACTERISATION PERMET DE DETERMINER LES CONDITIONS D'OBTENTION DES DIFFERENTS TYPES DE MICROSTRUCTURES ET DE CONSTRUIRE LES DIAGRAMMES DE MARCHE PRENANT EN COMPTE LES PARAMETRES D'IRRADIATION. DU POINT DE VUE DES PROPRIETES D'EMPLOI, NOUS AVONS MIS EN EVIDENCE L'INFLUENCE BENEFIQUE DU PHOSPHORE SUR LA DURETE SUPERFICIELLE ET MONTRE, PAR CONTRE, QUE LA RESISTANCE A LA CORROSION ETAIT PEU AFFECTEE PAR LE TRAITEMENT LASER. NOUS AVONS EGALEMENT MIS AU POINT UNE TECHNIQUE NOUVELLE D'ELABORATION D'ALLIAGES DE SURFACE METTANT EN UVRE LA DECOMPOSITION ASSISTEES PAR LASER DE PRECURSEURS (SELS METALLIQUES) SUIVIE DE L'ALLIAGE A L'ETAT LIQUIDE DES ELEMENTS NATIFS. PAR CETTE VOIE, NOUS AVONS OUVERT DES POSSIBILITES D'ELABORATION D'ALLIAGES FE-NI, FE-CR-NI, FE-CR-NI-MO

Download or read book Surface Engineering of Metals written by Tadeusz Burakowski and published by CRC Press. This book was released on 1998-12-23 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Engineering of Metals provides basic definitions of classical and modern surface treatments, addressing mechanisms of formation, microstructure, and properties of surface layers. Part I outlines the fundamentals of surface engineering, presents the history of its development, and proposes a two-category classification of surface layers. Discussions include the basic potential and usable properties of superficial layers and coatings, explaining their concept, interaction with other properties, and the significance of these properties for proper selection and functioning. Part II provides an original classification of the production methods of surface layers. Discussions include the latest technologies in this field, characterized by directional or beam interaction of particles or of the heating medium with the treat surface.

Download or read book Introduction to Surface Engineering written by P. A. Dearnley and published by Cambridge University Press. This book was released on 2017-01-16 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: This highly illustrated reference work covers the three principal types of surface technologies that best protect engineering devices and products: diffusion technologies, deposition technologies, and other less commonly acknowledged surface engineering (SE) techniques. Various applications are noted throughout the text and additionally whole chapters are devoted to specific SE applications across the automotive, gas turbine engine (GTE), metal machining, and biomedical implant sectors. Along with the benefits of SE, this volume also critically examines SE's limitations. Materials degradation pathways - those which can and those which cannot be mitigated by SE - are rigorously explained. Written from a scientific, materials engineering perspective, this concise text is supported by high-quality images and photo-micrographs which show how surfaces can be engineered to overcome the limits of conventionally produced materials, even in complex or hostile operating environments. This book is a useful resource for undergraduate and postgraduate students as well as professional engineers.

Download or read book Diffusion in Materials DIMAT 2011 written by Igor Bezverkhyy and published by Trans Tech Publications Ltd. This book was released on 2012-04-12 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools. Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.

Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.

Download or read book ASM Handbook Vol 5 Surface Engineering written by American Society for Metals. ; ASM International.; Handbook Committee and published by . This book was released on 1994 with total page 1039 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dictionary of Technical Terms for Aerospace Use written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1965 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Brief definitions "intended to be as clear as possible to the non-expert, but accuracy has not been compromised for the sake of readability. Mathematics has been used where necessary to avoid ambiguity."--Intro. Published 1965.

Download or read book Guide for Aluminum Hull Welding written by and published by . This book was released on 2004 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Historical Dictionary of Pakistan written by Shahid Javed Burki and published by . This book was released on 1999 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pakistan is unlike most other countries in the emerging world. It is one of the two nations – the other being the state of Israel – founded on the basis of religion. Although it was created to provide a homeland for the Muslim community of British India, in its original form it was able to accommodate only about half of the people of Islamic faith who lived in the subcontinent. Pakistan’s birth in 1947 resulted in one of the largest movements of people in human history when some 14 million people left their homes, with 8 million Muslims leaving India for what is now Pakistan and 6 million Hindus and Sikhs moving in the opposite direction. This was the first large-scale incidence of ethnic cleansing the world was to witness. --

Download or read book Surface Engineering written by Ken N. Strafford and published by Routledge. This book was released on 2018-12-12 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Engineering: Processes and Applications: This volume covers both innovative and basic methods of surface engineering for improved surface properties.

Download or read book Forms Supplement written by and published by . This book was released on 1984 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Structural Use of Aluminium written by Council for Codes of Practice and published by . This book was released on 1969-06-18 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminium, Aluminium alloys, Structural design, Design, Construction materials, Metal sections, Structural members, Structural systems, Loading, Acceptance (approval), Approval testing, Joints, Corrosion protection, Joining processes

Download or read book Global Warming and Climate Change written by Emma Carlson Berne and published by Referencepoint Press. This book was released on 2008 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout the world, the cause and impact of global warming and climate change is being passionately debated. While many claim that a climate crisis is imminent if greenhouse gases are not curbed, others argue that the effects have been overblown. Through objective overviews, primary sources, and full-color illustrations, this title will examine What Is Global Warming and Climate Change? What Are the Consequences of Global Warming? What Are the Controversies Surrounding Global Warming? What Are the Solutions for Global Warming?

Download or read book Specification for Tube of 99 Aluminium written by British Standards Institute Staff and published by . This book was released on 1986-02-28 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminium, Seamless pipes, Pipes, Cold-working, Drawing (forming process), Purity, Chemical composition, Thickness, Diameter, Tensile strength, Air transport engineering, Hydraulic tests, Test pressure, Non-destructive testing

Download or read book Specification for Aluminium Collapsible Tubes written by British Standards Institute Staff and published by . This book was released on 1984-09-01 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tubes (packages), Deformable packages, Packages, Packaging, Aluminium, Coatings, Dimensions, Closures, Caps (closures), Orifices, Length, Diameter, Thickness, Seals, Threads, Leak tests, Annealing, Mechanical testing, Crushing tests, Adhesion tests, Test equipment, Electrical testing, Circuits, Flexibility