Appendice Caratteristiche Dettagliate dei Materiali Utilizzati

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1 Appendice Caratteristiche Dettagliate dei Materiali Utilizzati A.1 Materiale AISI 9840 UNI 38NiCrMo4 AISI 9840 Steel, 650 C (1200 F) temper, 25 mm (1 in.) round Material Notes: Quenched, 540 C temper, 525 C nitride for 40 hours with 20-30% ammonia dissociation, hardness of 88 HR15N case hardness at mm nitrided case depth Density 7.87 g/cc lb/in³ Hardness, Brinell Hardness, Knoop Hardness, Rockwell B Hardness, Rockwell C Hardness, Vickers Tensile Strength, Ultimate 965 MPa psi Tensile Strength, Yield 825 MPa psi Elongation at Break 19.0 % 19.0 % Modulus of Elasticity 200 GPa ksi Bulk Modulus 140 GPa ksi Poissons Ratio Machinability 70 % 70 % Shear Modulus 80.0 GPa ksi Electrical Resistivity ohm-cm ohm-cm CTE, linear 11.5 µm/m C 6.39 µin/in F 169

2 12.2 µm/m- 250 C 6.78 µin/in- 482 F 13.9 µm/m- 500 C 7.72 µin/in- 932 F 14.7 µm/m C 8.17 µin/in F Specific Heat Capacity J/g- C BTU/lb- F Thermal Conductivity 51.9 W/m-K 360 BTU-in/hr-ft²- F Carbon, C % % Chromium, Cr 0.80 % 0.80 % Iron, Fe 96.0 % 96.0 % Manganese, Mn 0.80 % 0.80 % Molybdenum, Mo 0.25 % 0.25 % Nickel, Ni 1.0 % 1.0 % Phosphorous, P <= % <= % Silicon, Si % % Sulfur, S <= % <= % 170

3 A.2 Materiale AISI 8740 UNI 40NiCrMo2 AISI 8740 Steel, normalized 870 C (1600 F), 50 mm (2 in.) round Material Notes: Normalized at 870 C, air cooled, 50 mm round Density 7.85 g/cc lb/in³ Hardness, Brinell Hardness, Knoop Hardness, Rockwell B Hardness, Rockwell C Hardness, Vickers Tensile Strength, Ultimate 910 MPa psi Tensile Strength, Yield 800 MPa psi Elongation at Break 16.7 % 16.7 % Modulus of Elasticity 205 GPa ksi Bulk Modulus 140 GPa ksi Poissons Ratio Machinability 65 % 65 % Shear Modulus 80.0 GPa ksi Electrical Resistivity ohm-cm ohm-cm Specific Heat Capacity J/g- C BTU/lb- F Thermal Conductivity 46.6 W/m-K 323 BTU-in/hr-ft²- F Carbon, C % % Chromium, Cr 0.50 % 0.50 % Iron, Fe 97.0 % 97.0 % Manganese, Mn % % Molybdenum, Mo 0.25 % 0.25 % Nickel, Ni 0.55 % 0.55 % Phosphorous, P <= % <= % Silicon, Si % % Sulfur, S <= % <= % 171

4 A.3 Materiale Ti6Al4V Material Notes: Titanium Ti-6Al-4V (Grade 5), Annealed Information provided by Allvac and the references. Annealing Temperature ºC. Alpha- Beta Alloy. Applications: Blades, discs, rings, airframes, fasteners, components. Vessels, cases, hubs, forgings. Biomedical implants. Biocompatibility: Excellent, especially when direct contact with tissue or bone is required. Ti- 6Al-4V's poor shear strength makes it undesirable for bone screws or plates. It also has poor surface wear properties and tends to seize when in sliding contact with itself and other metals. Surface treatments such as nitriding and oxidizing can improve the surface wear properties. 4 other heat treatments of this alloy are listed in MatWeb. Density 4.43 g/cc lb/in³ Hardness, Brinell Hardness, Knoop Hardness, Rockwell C Hardness, Vickers Tensile Strength, Ultimate 950 MPa psi Tensile Strength, Yield 880 MPa psi Elongation at Break 14.0 % 14.0 % Reduction of Area 36.0 % 36.0 % Modulus of Elasticity GPa ksi Compressive Yield Strength 970 MPa psi Notched Tensile Strength 1450 MPa psi Ultimate Bearing Strength 1860 MPa psi Bearing Yield Strength 1480 MPa psi Poissons Ratio Charpy Impact 17.0 J 12.5 ft-lb Fatigue Strength 240 MPa psi 510 MPa psi Fracture Toughness 75.0 MPa-m½ 68.3 ksi-in½ Shear Modulus 44.0 GPa 6380 ksi Shear Strength 550 MPa psi Electrical Resistivity ohm-cm ohm-cm Magnetic Permeability Magnetic Susceptibility CTE, linear 8.60 µm/m C 4.78 µin/in F 172

5 9.20 µm/m C 5.11 µin/in F 9.70 µm/m C 5.39 µin/in F Specific Heat Capacity J/g- C BTU/lb- F Thermal Conductivity 6.70 W/m-K 46.5 BTU-in/hr-ft²- F Melting Point C F Solidus 1604 C 2919 F Liquidus 1660 C 3020 F Beta Transus 980 C 1800 F Aluminum, Al 6.0 % 6.0 % Iron, Fe <= 0.25 % <= 0.25 % Oxygen, O <= 0.20 % <= 0.20 % Titanium, Ti 90.0 % 90.0 % Vanadium, V 4.0 % 4.0 % 173

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