中高碳特殊钢连铸方坯宏观偏析控制

Chapter 1 Heredity of Center Segregation in Bloom on Hot Rolled Bars 1.1 Introduction 1.2 Experimental Section 1.2.1 Determination of Continuous Casting Parameters 1.2.2 Samples Analysis 1.3 Results and Discussions 1.3.1 Solidification End of Bloom 1.3.2 Magnetic Field Characteristics of Electromagnetic Stirring 1.3.3 Influencing Factors of Solidification Structure and Center Segregation 1.3.4 The Heredity of Center Segregation in Bloom on the Heredity 1.4 Conclusions References Chapter 2 Evolution of Solidification Law and Structure in Bloom 2.1 Introduction 2.2 Mathematical Models 2.2.1 Thermophysical Properties of Material 2.2.2 Heat Transfer Model 2.2.3 Nucleation Model 2.2.4 Dendrite Tip Growth Kinetics Model 2.2.5 Calculation Procedure of CAFE Model 2.2.6 SDAS Model 2.3 Model Verification 2.3.1 Validation of Heat Transfer Model 2.3.2 Validation of CAFE Model 2.3.3 Verification of SDAS Model 2.4 Results and Discussion 2.4.1 Effect of CC Process Parameters on Solidification Behavior 2.4.2 Effect of CC Process Parameters on Solidification Structure 2.4.3 Effect of CC Process Parameters on SDAS 2.4.4 Optimization of CC Process Parameters 2.5 Conclusions References Chapter 3 Macrosegregation of High Carbon Steel Bloom with M-EMS 3.1 Introduction 3.2 Experimental Method 3.3 Mathematical Models 3.3.1 Basic Assumption 3.3.2 The Fluid Flow Model 3.3.3 Heat Transfer Model 3.3.4 Solute Transport Model 3.3.5 The Electromagnetic Model 3.3.6 Model Validation 3.4 Result and Discussion 3.4.1 Macrosegregation in the Cross Section of High Carbon Steel Bloom 3.4.2 Formation of Negative Segregation Band in High Carbon Steel Bloom 3.4.3 Influencing Factors of Negativesegregation Band 3.5 Conclusions References Chapter 4 Macrosegregation Control in Billet and Bloom by M+F-EMS 4.1 Introduction 4.2 Development and Application of Electromagnetic Torque Device 4.2.1 Electromagnetic Torque Model with M-EMS 4.2.2 Design of the Electromagnetic Torque Device 4.2.3 Investigation Method 4.2.4 Results and Discussion 4.3 Effects of Electromagnetic Stirring on Fluid Flow and Temperature Distribution 4.3.1 Model Description 4.3.2 Results and Discussion 4.4 Industry Application 4.4.1 Improvement of Macrosegregation in Billet by M-EMS 4.4.2 Reduction of Center Segregation in Billet by M+F-EMS 4.4.3 Control of Macrosegregation in Rectangular Bloom by M+F-EMS 4.5 Conclusions References Chapter 5 Control of Macrosegregation in Bloom by M+F-EMS and MSR 5.1 Introduction 5.2 Reducing Macrosegregation in High Carbon Steel Bloom by F-EMS and MSR 5.2.1 Model Description 5.2.2 Determining of Process Parameters 5.2.3 Model Validation and Application 5.3 High-efficiency CC of High Carbon Steel Bloom by M+F-EMS and MSR 5.3.11 Background 5.3.2 Model Description and Validation 5.3.3 Experiments 5.3.4 Results and Discussion 5.4 Improvement of Macrosegregation in Bloom Using DSR 5.4.1 Investigation Work 5.4.2 Determination of Process Parameters 5.4.3 Optimization Application 5.5 Conclusions References