声明
NOMENCLATURE
CHAPTER 1 INTRODUCTION
1.1 Laser Based Additive Manufacturing (LBAM)
1.2 Repair of IN718 based Turbofan
1.3 Proposed Repair Procedure
1.4 Motivation
1.5 Organization of the thesis
1.6 Contribution of the thesis
CHAPTER 2 LITERATURE
2.1 Introduction
2.2 Proposed Methodology to Achieve Desired Mechanical Properties
CHAPTER 3 NUMERICAL MODELING
3.1 Introduction
3.2 Assumptions
3.3 Numerical Modeling
3.4 Boundary Conditions used in LAM
3.5 Simulation:inputs, results and analysis
CHAPTER 4 TEMPERATURE FIELD AND COOLING RATE OF THE MELT POOL
4.1 Introduction
4.2 Experimental validations
4.3 Laser Parameters vs Temperature field and Cooling Process
4.4 Conclusion
CHAPTER 5 NUMERICAL MODELING VS MICROSTRUCTURE
5.1 Microstructure
5.2 Effects of Deposition Strategy on the Microstructure and Mechanical Properties
CHAPTER 6 CONCLUSION AND FUTURE WORKS
6.1 Conclusion
6.2 Future Works
参考文献
APPENDIX I MELT POOL GEOMETRY CHANGE WITH DIFFERENT PROCESS PARAMETERS
APPENDIX II STANDARD HEAT TREATMENT PRACTICES FOR NICKEL-BASED ALLOYS
APPENDIX III TURBOFAN AND LASER CLADDING EQUIPMENT