지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
이용수0
2023
Chapter 1 Introduction 11.1 Wire-Arc Additive Manufacturing (WAAM) background 11.2 Previous studies and insufficient points 71.3 Research goals of this study 10Chapter 2 Theoretical background 112.1 Metallurgy of titanium alloy 112.1.1 Alloy of Titanium 112.1.2 α+β Alloys 122.2 Typical phase transformations in Ti-6Al-4V 132.3 Solidification theory 19Chapter 3 Experimental and modeling methods 213.1 Experimental 213.1.1 WAAM specimens with different heat input 213.1.2 WAAM specimens with different travel speed 273.1.3 WAAM specimens with different rapid cooling 303.2 Numerical model of thermal analysis- 36Chapter 4 Effect of heat input on microstructure and mechanical property 414.1 Results and discussion 414.1.1 Solidification morphology for various heat inputs 414.1.2 Microstructure for various heat inputs 454.1.3 Anisotropic tensile strength for various heat inputs 494.1.4 Thermal simulation for various heat inputs 514.1.5 Effect of heat input on grain morphology 534.1.5.1 Temperature gradient () simulated for various heat inputs 534.1.5.2 Cooling rates simulated for various heat inputs 554.1.5.3 Solidification rates for various heat inputs 574.1.6 Effect of heat input on microstructure- 594.1.6.1 Precise characterisation of fine secondary α 594.1.6.2 Mechanism of microstructural evolution of secondary α 634.2 Conclusion 70Chapter 5 Effect of deposition speed on microstructure and mechanical property 715.1 Results and discussions 715.1.1 Grain structure and anisotropic tensile strength at different deposition speeds 715.1.2 Thermal history simulation results with different deposition speed 755.2 Conclusion 81Chapter 6 Effect of interpass cooling rate on microstructure and mechanical property 826.1 Result and discussion 826.1.1 Solidification morphology (prior-β grains) for various shielding and cooling methods 826.1.2 HAZ and segregation bands for various shielding and cooling methods 846.1.3 Microstructural characteristics for various shielding and cooling methods 906.1.3.1 Top region of specimens N and R 916.1.4 Oxygen and nitrogen contents for various shielding and cooling methods 1036.1.5 Mechanical property for various shielding and cooling methods 1066.2 Conclusion 112Chapter 7 Future works 1137.1 In-depth investigation of globularization α evolution mechanism and heat treatments 1147.2 Validation of Oxygen and Nitrogen contents and its mechanism 1157.3 Process design for microstructure and property control 1167.4 Strategies and processes for high quality and residual stress in Wire Arc Additive Manufacturing 117References 118
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