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Effect of Operation Parameters on Grain Morphology of Inconel 718 Superalloy Fabricated by Laser Additive Manufacturing

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Effect of Operation Parameters on Grain Morphology of Inconel 718 Superalloy Fabricated by Laser Additive Manufacturing
論文目錄
 
Abstract第1-7頁
摘要第7-8頁
Acknowledgements第8-17頁
CHAPTER 1 INTRODUCTION第17-20頁
  1.1 Background第17頁
  1.2 Problem Statement第17-18頁
  1.3 Scope of Study第18-19頁
  1.4 Assumptions and Limitations第19頁
  1.5 Objective of the Research第19-20頁
    1.5.1 Main Objective第19頁
    1.5.2 Specific Objectives第19-20頁
CHAPTER 2 LITERATURE REVIEW第20-33頁
  2.1 Additive manufacturing第20-21頁
  2.2 Nickel based Super alloys and Inconel 718第21-23頁
  2.3 Microstructure of Direct metal deposited Inconel 718第23頁
  2.4 Grain Morphology and Interface Instability第23-28頁
    2.4.1 Segregation in Alloys第25-26頁
    2.4.2 Solidification Theory and Effects of Cooling rate on Solidification第26頁
    2.4.3 Columnar to Equiaxed Transition (CET)第26-27頁
    2.4.4 Some Works on Laser Additive manufacturing of Inconel 718第27-28頁
  2.5 Phase Constitution and Heat Treatment第28-32頁
  2.6 Conclusion第32-33頁
CHAPTER 3 METHODOLOGY第33-47頁
  3.1 Methodology Steps第33-34頁
  3.2 Theoretical Approach第34-43頁
    3.2.1 Theoretical Calculation of Dendrite Tip Radius, Primary Dendrite ArmSpacing and Cooling Rate第34-38頁
    3.2.2 Columnar to Equiaxed Transition (CET)-Analytical Approach第38-40頁
    3.2.3 CET and Simulation第40-43頁
  3.3 Experimental Procedure第43-47頁
    3.3.1 Determination of Microstructure of Turbofan第43頁
    3.3.2 Determination of optimum parameters第43-44頁
    3.3.3 Heat Treatment第44-46頁
    3.3.4 Sample Preparation第46頁
    3.3.5 Vickers Micro-hardness Testing第46-47頁
CHAPTER 4 RESULTS AND DISCUSSION第47-69頁
  4.1 Microstructure第47-57頁
    4.1.1 Microstructure of Inconel Turbofan第47頁
    4.1.2 Microstructure of a typical laser clad of Inconel 718第47-49頁
    4.1.3 Influence of operating parameters on dendritic morphology with coolingwater base for single layer deposition第49-51頁
    4.1.4 Analysis of OM micrographs of multiple layer, multiple track depositionwith cooling water base第51-53頁
    4.1.5 Influence of operating parameters on dendritic morphology with coolingwater base for single track multiple layer deposition第53-54頁
    4.1.6 Influence of operating parameters on dendritic morphology with only aircooled condition (without cooling water base) for single track multiplelayer deposition第54-55頁
    4.1.7 Primary Dendrite Arm Spacing (PDAS) and Cooling Rate第55-57頁
  4.2 Heat Treatment第57-60頁
    4.2.1 Microstructure第57-59頁
    4.2.2 Hardness第59-60頁
  4.3 Phase Constitution of As-deposited Inconel 718第60-61頁
  4.4 Relationship between Hardness and Grain Morphology第61-62頁
  4.5 Repair Technology and Application第62-69頁
    4.5.1 Repair Technology in General第62-63頁
    4.5.2 Repair Application in Current Study第63-64頁
    4.5.3 Results for Boronized Clad Surfaces第64-67頁
    4.5.4 Results for Deposition of Inconel 718 powder mixed with boron powder第67-69頁
CHAPTER 5 CONCLUSION第69-71頁
REFERENCES第71-75頁
APPENDIX A第75-78頁
APPENDIX B第78-81頁
APPENDIX C第81-82頁
APPENDIX D第82-85頁

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