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Direct-Chill Casting of Light Alloys: Science and Technology(English)

Direct-Chill Casting of Light Alloys: Science and Technology(English)

          
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About the Book

Direct-chill casting is the major production route for wrought aluminium and magnesium alloys that are later deformed (rolled, extruded, forged) to the final products. To aid in this process, this book provides comprehensive coverage on topics such as the history of process development in this field, industrial applications, including vertical and horizontal casting, melt preparation, fundamentals of solidification in DC casting, and more. The first book targeted for the industrial researcher and practitioner, it pulls together the practice and process of physics with the goal of improving process performance.

Table of Contents:
PREFACE AND ACKNOWLEDGEMENTS xi 1 DIRECT-CHILL CASTING: HISTORICAL AND INDUSTRIAL PERSPECTIVE 1 1.1 Industrial Perspective 1 1.2 Historical Development 2 References 27 2 LIQUID METAL SUPPLY, ALLOY PREPARATION, AND MELT TRANSPORT 30 2.1 Plant Layout, Metal Scheduling, and Liquid Supply 31 2.2 Alloying Elements and Master Alloys 33 2.3 Furnace Technology 37 2.3.1 Mixing Technology 40 2.3.2 Temperature Control 41 2.4 Melt Transport to and from the Furnace 43 2.4.1 Furnace Filling 43 2.4.2 Scrap Charging and Melting 44 2.4.3 Furnace Cleaning 46 2.4.4 Molten Metal Transportation from Furnace to Caster 46 2.5 Chemical Analysis 49 2.6 Magnesium Melt Protection and Handling 50 2.7 Safety 52 References 53 3 MELT REFINING AND IMPURITY CONTROL 56 3.1 Impurity Sources 58 3.1.1 Aluminium 58 3.1.2 Magnesium 61 3.2 Effect of Impurities 62 3.2.1 Dissolved Hydrogen 62 3.2.2 Dissolved Metallic Impurity Elements Including Alkali Metals 63 3.2.3 Inclusions 65 3.3 Impurity Removal 65 3.3.1 Dissolved Metal Impurities 67 3.3.2 Hydrogen Removal: Degassing 67 3.3.3 Inclusion Load Minimisation 73 3.3.4 Inclusion Removal 74 3.3.5 Alkali Metal Removal 81 3.3.6 Magnesium Flux Refining 83 3.3.7 Flux-Free Refi ning of Magnesium 85 3.4 Measurement of Impurities 85 3.4.1 Inclusion Measurement 85 3.4.2 Hydrogen Measurement 89 3.4.3 Alkali Content Measurement 91 3.5 Temperature Measurement 91 3.6 System Layouts, Safety, and Cost Considerations 92 References 94 4 GRAIN REFINEMENT 103 4.1 Historical Overview 103 4.2 Fundamentals of Grain Refinement 104 4.3 Mechanisms of Grain Refinement in Aluminium and Magnesium Alloys 112 4.3.1 Grain Refinement through Phases Formed by Alloying Elements during Solidification 113 4.3.2 Grain Refinement by Added Insoluble Particles 115 4.3.3 Grain Refinement by Indigenous Insoluble Particles 121 4.3.4 Grain Refinement by Multiplication of Solidification Sites 125 4.4 Technology of Grain Refinement in DC Casting 128 4.4.1 Grain Refining of Aluminium Alloys by Al?Ti?B and Al?Ti?C Master Alloy Rods 128 4.4.2 Grain Refinement Using Master Alloys Added in the Furnace 136 4.4.3 Addition of Grain Refiners as Salts, Fluxes, Compounds, and Gases 137 References 139 5 SOLIDIFICATION PHENOMENA AND CASTING DEFECTS 144 5.1 Effect of Cooling Rate and Melt Temperature on Solidifi cation of Aluminium Alloys 144 5.2 Microsegregation 148 5.3 Effects of Process Parameters on the Dendrite Structure 149 5.4 Effect of Process Parameters and Alloy Composition on the Occurrence of Specific Structure Defects 155 5.5 Macrosegregation 158 5.5.1 Mechanisms of Macrosegregation 158 5.5.2 Effects of Process Parameters on Macrosegregation during DC Casting 165 5.5.3 Effect of Composition on Macrosegregation: Macrosegregation in Commercial Alloys 169 5.6 Hot Tearing 173 5.6.1 Thermal Contraction during Solidification 174 5.6.2 Mechanical Properties in the Semi-Solid State 177 5.6.3 Mechanisms and Criteria of Hot Tearing 181 5.6.4 Application of Hot-Tearing Criteria to DC Casting of Light Alloys 191 5.6.5 Effects of Process Parameters on Hot Tearing and Shape Distortions during DC Casting 196 5.7 Cold Cracking 204 5.7.1 Mechanical Properties of As-Cast Alloys and Mechanisms of Cold Cracking 206 5.7.2 Cold-Cracking Criteria 210 5.7.3 Methods to Prevent Cold Cracking 218 5.8 Defects Related to the Technology of DC Casting 219 References 226 6 DC CASTING TECHNOLOGY AND OPERATION 235 6.1 Introduction 235 6.2 Mould Technology 236 6.2.1 Mould Heat Transfer 237 6.2.2 Water Cooling Heat Transfer 244 6.2.3 Mould Design: General Development 249 6.2.4 Electromagnetic DC Casting 253 6.2.5 Extrusion Billet Mould Technology Variants and Evolution 255 6.2.6 Gas-Pressurised Hot-Top Mould Operation 258 6.2.7 Mould Dimensions 259 6.2.8 Casting Parameters 266 6.2.9 Rolling Slab Moulds and Cast Start Technology 271 6.2.10 HDC Casting 273 6.2.11 Lubrication and Mould Friction 279 6.3 Other Equipment 281 6.3.1 Mould Table 281 6.3.2 Starting Head Base and Starting Heads 284 6.3.3 Molten Metal Delivery to the Moulds 289 6.3.4 Molten Metal Level Control 293 6.3.5 Casting Machine 298 6.3.6 Ancillary Equipment and Pit Engineering 300 6.4 Water System 303 6.4.1 General Description 303 6.4.2 Water Requirements 305 6.5 Control Systems 306 6.5.1 General Requirements 306 6.5.2 Automated Systems 307 6.6 Equipment Failure-Related Defects 310 6.7 Safety Considerations 311 References 314 7 POST-CASTING PROCESSING 321 7.1 Introduction 321 7.2 General 321 7.3 Inspection and Sawing 322 7.4 Homogenisation and Stress Relieving 323 7.5 Sawing and Packaging 328 7.6 Safety Issues 329 References 329 8 MODELLING AND SIMULATION 331 8.1 Introduction and History 331 8.2 Physical Modelling 333 8.2.1 Flow Modelling 333 8.2.2 Water Spray Heat Transfer 333 8.3 Non-Dimensional Number Analysis 334 8.4 Mathematical Modelling Methods 337 8.5 Modelling Requirements 339 8.5.1 Model Formulation 339 8.5.2 Boundary Condition and Property Data 339 8.5.3 Validation and Experimental Verification 341 8.5.4 Post Processing 343 8.5.5 Resources: People, Hardware, and Software 343 8.6 Flow Modelling of Metal Delivery Systems 344 8.7 Macrosegregation Modelling during DC Casting of Aluminium Alloys 346 8.7.1 Background 346 8.7.2 Example of Macrosegregation Simulation 349 8.8 Stress and Cracking Modelling 351 8.8.1 Hot Tearing during DC Casting 352 8.8.2 Cold Cracking during DC Casting 360 8.9 Modelling of Mould Processes 363 8.9.1 Mould Distortion, Ingot Shape Modelling, and Control 363 8.9.2 Air-Gap Formation and Surface Segregation 368 8.9.3 Gas-Pressurised Mould Meniscus Modelling 368 8.10 Modelling of Magnesium DC Casting 369 8.11 Final Remarks on Application of Models 370 Acknowledgement 371 Appendix 8.A Analytical Solutions to DC Casting 371 References 375 9 ECONOMIC CONSIDERATIONS 383 9.1 DC Product Markets and Margins 384 9.2 Financial Measures 386 9.2.1 Examples of the Application of Financial Measures 387 9.3 Throughput, Audit, Key Performance Indicator (KPI), and Benchmarking Analysis 395 References 399 INDEX 400


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Product Details
  • ISBN-13: 9781118022658
  • Publisher: John Wiley & Sons Inc
  • Publisher Imprint: Wiley-Tms
  • Depth: 32
  • Language: English
  • Returnable: N
  • Spine Width: 31 mm
  • Weight: 680 gr
  • ISBN-10: 1118022653
  • Publisher Date: 05 Nov 2013
  • Binding: Hardback
  • Height: 239 mm
  • No of Pages: 424
  • Series Title: English
  • Sub Title: Science and Technology
  • Width: 158 mm


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