| Preface | 6 |
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| Contents | 8 |
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| 1 Introduction | 14 |
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| Abstract | 14 |
| 1.1 Historical Background | 14 |
| 1.1.1 Stone Age | 14 |
| 1.1.2 Bronze Age | 15 |
| 1.1.3 Iron Age | 16 |
| 1.2 Modern Engineering Materials | 17 |
| 1.2.1 Steels | 18 |
| 1.2.2 Titanium and Its Alloys | 18 |
| 1.2.3 Superalloys | 19 |
| 1.2.4 Metal Matrix Composites (MMCs) | 19 |
| 1.2.5 Ceramics | 19 |
| 1.3 Superior Characteristics, Major Challenges | 20 |
| Reference | 20 |
| 2 Hardened Steels | 21 |
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| Abstract | 21 |
| 2.1 Introduction | 21 |
| 2.1.1 Heat Treatment | 22 |
| 2.1.2 Cryogenic Treatment | 23 |
| 2.1.3 Case Hardening | 24 |
| 2.1.3.1 Carburizing | 24 |
| 2.1.3.2 Gas Nitriding | 25 |
| 2.1.3.3 Induction Hardening | 25 |
| 2.1.3.4 Flame Hardening | 25 |
| 2.2 Historical Background and Evolution of Hardened Steels | 26 |
| 2.3 Metallurgy of Hardened Steels | 28 |
| 2.4 Characteristics of Hardened Steels | 31 |
| 2.4.1 High Indentation Hardness | 31 |
| 2.4.2 Low Ductility (Brittleness) | 31 |
| 2.4.3 High Hardness/E-modulus Ratio | 31 |
| 2.4.4 Corrosion Sensitivity | 32 |
| 2.5 Industrial Applications of Hardened Steels | 32 |
| 2.5.1 Applications of Case-Hardened Steels | 33 |
| 2.5.2 Applications of Induction Hardened Steels | 33 |
| 2.5.3 Applications of Carburized Steels | 34 |
| 2.6 Challenges in the Machining of Hardened Steels | 35 |
| 2.7 Hard Turning | 37 |
| 2.7.1 Hard Turning as an Alternative for Grinding | 38 |
| 2.7.2 Special Features of Hard Turning | 39 |
| 2.7.3 Rigidity Imposed Limitations in Hard Turning | 41 |
| 2.7.4 Surface Quality and Integrity | 41 |
| 2.7.4.1 Formation of White Layer | 41 |
| 2.7.4.2 Residual Stresses | 44 |
| 2.7.4.3 Material Side Flow | 45 |
| 2.8 Mechanics of Chip Formation During Hard Turning | 46 |
| 2.9 Influential Factors on Chip Formation During Hard Turning | 50 |
| 2.9.1 Nose Radius | 50 |
| 2.9.2 Edge Preparation and Tool Condition | 50 |
| 2.9.3 Feed | 51 |
| 2.10 Dynamics of Chip Formation | 54 |
| 2.11 Cutting Forces During Hard Turning | 55 |
| 2.12 Appropriate Tool Materials for Hard Turning | 56 |
| 2.12.1 CBN and PCBN Tools | 57 |
| 2.12.2 Ceramic Tools | 60 |
| 2.12.3 Cermet (Solid Titanium Carbide) Tools | 61 |
| 2.13 Surface Finish in Hard Turning | 62 |
| 2.14 Environmentally Friendly Hard Turning | 63 |
| 2.15 Hard Milling | 63 |
| 2.16 Concluding Remarks | 64 |
| References | 64 |
| 3 Titanium and Titanium Alloys | 67 |
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| Abstract | 67 |
| 3.1 Introduction | 67 |
| 3.2 Historical Background and Evolution of Titanium | 69 |
| 3.3 Metallurgy of Titanium | 71 |
| 3.3.1 Alpha (?) Alloys | 73 |
| 3.3.2 Near-Alpha (?) Alloys | 73 |
| 3.3.3 Alpha-Beta (??+??) Alloys | 74 |
| 3.3.4 Metastable Beta (?) Alloys | 74 |
| 3.3.5 Beta (?) Alloys | 75 |
| 3.3.6 Titanium Aluminides | 75 |
| 3.4 Characteristics of Titanium and Its Alloys | 76 |
| 3.5 Industrial Applications of Titanium and Its Alloys | 80 |
| 3.5.1 Aerospace Applications | 80 |
| 3.5.2 Chemical and Petrochemical Applications | 83 |
| 3.5.3 Automotive Applications | 84 |
| 3.6 Challenges in the Machining of Titanium and Its Alloys | 86 |
| 3.6.1 Poor Thermal Conductivity | 87 |
| 3.6.2 Chemical Reactivity | 89 |
| 3.6.3 Low Modulus of Elasticity | 89 |
| 3.6.4 Hardening Effect | 90 |
| 3.7 Mechanics of Chip Formation | 90 |
| 3.7.1 Chip Segmentation Under Adiabatic Shear | 92 |
| 3.8 Appropriate Tool Materials and Modes of Tool Wear | 97 |
| 3.8.1 HSS Tools | 98 |
| 3.8.2 Carbide Tools | 99 |
| 3.8.3 Ceramic Tools | 101 |
| 3.8.4 CBN and PCBN Tools | 101 |
| 3.8.5 Diamond Tools | 102 |
| 3.9 Application of Coolant in the Machining of Titanium | 103 |
| 3.9.1 Utilization of Nano-cutting Fluids | 104 |
| 3.10 Concluding Remarks | 105 |
| References | 106 |
| 4 Superalloys | 109 |
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| Abstract | 109 |
| 4.1 Introduction | 109 |
| 4.2 Historical Background and Evolution of Superalloys | 111 |
| 4.3 Metallurgy of Superalloys | 115 |
| 4.3.1 Phases of Superalloys | 117 |
| 4.3.1.1 Gamma (?) Phase | 117 |
| 4.3.1.2 Gamma Prime (??) Phase | 117 |
| 4.3.1.3 Gamma Double Prime (??) Phase | 118 |
| 4.3.1.4 Carbides | 118 |
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