Inconel 625
L' Inconel 625 è una lega di nichel resistente ad alte temperature e alla corrosione.
Questo tipo di materiale è caratterizzato da un'alta resistenza all'usura ed alla rottura e per la realizzazione di parti finite capaci vantare ottima tolleranza a stress meccanici e termici anche se esposti in ambiente tendente all'ossidazione.
Inconel 718
L' Inconel 718 è una lega di nichel resistente alle alte temperature (fino a 700° C) e alla corrosione.
Questo materiale è adatto alle applicazioni resistenti alle alte temperature come parti di turbine a gas ed impianti industriali oltre che per applicazioni criogeniche.
Inconel 625 e 718: lavorazioni meccaniche di precisione e stampa 3d con sinterizzazione metalli DMLS.
Dati Tecnici Materiale
Inconel 625
| Technical Data | Test Method | |
| Typical achievable part accuracy, small parts | - - - - - - - | approx. ± 40 – 60 μm |
| Typical achievable part accuracy, large parts | - - - - - - - | approx. ± 0.2% |
| Min. wall thickness [1] | - - - - - - - | approx. 0.3 mm - 0.4mm |
| Surface roughness [2] after shot-peening | - - - - - - - | Ra 4 - 6.5 μm, Rz 20 - 50 μm |
| Surface roughness [2] after polishing | - - - - - - - | Rz up to < 0.5 μm |
| Physical and Chemical properties of parts | Test Method | |
| Material composition | - - - - - - - |
Ni (balance ≥ 58.00 wt-%) Cr (20.00 - 23.00 wt-%) Mo (8.00 - 10.00 wt-%) Nb (3.15 - 4.15 wt-%) Fe (≤ 5.00 wt-%) Ti (≤ 0.40 wt-%) Al (≤ 0.40 wt-%) Co (≤ 1.0 wt-%) C (≤ 0.10 wt-%) Ta (≤ 0.05 wt-%) Si, Mn (each ≤ 0.50 wt-%) P, S (each ≤ 0.015 wt-%) |
| Relative density | - - - - - - - | approx. 100 % |
| Density | - - - - - - - | approx. 8.4 g/cm3 |
| Mechanical properties of parts at 20°C (68°F) | Test Method | As Built | Stress Relieved [4] |
| Tensile strength [3] in horizontal direction (XY) |
ISO 6892-1:2009(B) Annex D |
typ. 990 ± 50 MPa typ. 144 ± 7 ksi |
min. 827 MPa (120ksi) typ.1040 ± 100 MPa (151 ±15 ksi) |
| Tensile strength [3] in vertical direction (Z) |
ISO 6892-1:2009(B) Annex D |
typ. 900 ± 50 MPa typ. 131 ± 7 ksi |
min. 827 MPa (120 ksi) typ. 930 ± 100 MPa (135 ±15 ksi) |
| Yield strength (Rp 0.2 %) [3] in horizontal direction (XY) |
ISO 6892-1:2009(B) Annex D |
typ. 725 ± 50 MPa typ. 105 ± 7 ksi |
min. 414 MPa (60 ksi) typ. 720 ± 100 MPa (104 ±15 ksi) |
| Yield strength (Rp 0.2 %) [3] in vertical direction (Z) |
ISO 6892-1:2009(B) Annex D |
typ. 615 ± 50 MPa typ. 89 ± 7 ksi |
min. 414 MPa (60 ksi) typ. 650 ± 100 MPa (94 ±15 ksi) |
| Modulus of elasticity [3] in horizontal direction (XY) |
ISO 6892-1:2009(B) Annex D |
typ. 170 ± 20 GPa typ. 25 ± 3 Msii |
typ. 170 ± 20 GPa typ. 25 ± 3 Msi |
| Modulus of elasticity [3] in vertical direction (Z) |
ISO 6892-1:2009(B) Annex D |
typ.140 ± 20 GPa typ. 20 ± 3 Msisi |
yp. 160 ± 20 GPa typ. 23 ± 3 Msi |
| Elongation at break [3] in horizontal direction (XY) |
ISO 6892-1:2009(B) Annex D |
typ. (35 ± 5) % |
min. 30 %, typ. (35 ± 5) % |
| Elongation at break [3] in vertical direction (Z) |
ISO 6892-1:2009(B) Annex D |
(42 ± 5) % |
min. 30 %, typ. (44 ± 5) % |
| Hardness [5] | EN ISO 6508-1 | - - - - - - - | approx. 30 HRC (287 HB) |
| Thermal properties of parts | Test Method | |
| Maximum operating temperature for parts under load | - - - - - - - |
approx. 650 °C approx. 1200 °F |
| Oxidation resistance to | - - - - - - - |
980 °C 1800 °F |
Inconel 718
| Technical Data | Test Method | |
| Typical achievable part accuracy, small parts | - - - - - - - | approx. ± 40 – 60 μm |
| Typical achievable part accuracy, large parts | - - - - - - - | approx. ± 0.2% |
| Min. wall thickness [1] | - - - - - - - |
typ. 0.3 - 0.4 mm typ. 0.012 – 0.016 inch |
| Surface roughness [2] after shot-peening | - - - - - - - | Ra 4 - 6.5 μm, Rz 20 - 50 μm |
| Surface roughness [2] after polishing | - - - - - - - | Rz up to < 0.5 μm |
| Physical and Chemical properties of parts | Test Method | |
| Material composition | - - - - - - - |
Ni (50 - 55 wt-%) Cr (17.0 - 21.0 wt-%) Nb (4.75 - 5.5 wt-%) Mo (2.8 - 3.3 wt-%) Ti (0.65 - 1.15 wt-%) Al (0.20 - 0.80 wt-%) Co (≤ 1.0 wt-%) Cu (≤ 0.3 wt-%) C (≤ 0.08 wt-%) Si, Mn (each ≤ 0.35 wt-%) P, S (each ≤ 0.015 wt-%) B (≤ 0.006 wt-%) Fe (balance) |
| Relative density | - - - - - - - | approx. 100 % |
| Density | - - - - - - - | approx. 8.15 g/cm3 |
| Mechanical properties of parts at 20°C (68°F) | As Built | Heat treated per AMS 5662 [3] | Heat treated per AMS 5664 [4] |
| Tensile strength [5] in horizontal direction (XY) |
typ. 1060 ± 50 MPa (154 ± 7 ksi) |
- - - - - - - | - - - - - - - |
| Tensile strength [5] in vertical direction (Z) |
typ. 980 ± 50 MPa (142 ± 7 ksi) |
min. 1241 MPa (180 ksi) typ. 1400 ± 100 MPa (203 ± 15 ksi) |
min. 1241 MPa (180 ksi) typ. 1380 ± 100 MPa (200 ± 15 ksi) |
| Yield strength (Rp 0.2 %) [5] in horizontal direction (XY) |
typ. 780 ± 50 MPa (113 ± 7 ksi) |
- - - - - - - | - - - - - - - |
| Yield strength (Rp 0.2 %) [5] in vertical direction (Z) |
typ. 634 ± 50 MPa (92 ± 7 ksi) |
min. 1034 MPa (150 ksi) typ. 1150 ± 100 MPa (167 ± 15 ksi) |
min. 1034 MPa (150 ksi) typ. 1240 ± 100 MPa (180 ± 15 ksi) |
| Modulus of elasticity [5] in horizontal direction (XY) |
typ. 160 ± 20 GPa (23 ± 3 Msi) |
- - - - - - - | - - - - - - - |
| Modulus of elasticity [5] in vertical direction (Z) | - - - - - - - |
170 ± 20 GPa 24.7 ± 3 Msi |
170 ± 20 GPa 24.7 ± 3 Msi |
| Elongation at break [5] in vertical direction (XY) | typ. (27 ± 5) % | - - - - - - - | - - - - - - - |
| Elongation at break [5] in vertical direction (Z) | typ. (31 ± 5) % |
min. 12 % typ. (15 ± 3) % |
min. 12 % typ. (18 ± 5) % |
| Hardness [6] |
approx. 30 HRC approx. 287 HB |
approx. 47 HRC approx. 446 HB |
approx. 43 HRC approx. 400 HB |
| Mechanical properties of parts at high temperature (649°C, 1200°F) | As Built | Heat treated per AMS 5662 [3] | Heat treated per AMS 5664 [4] |
| Tensile strength (Rm) [7] in vertical direction (Z) | - - - - - - - |
min. 965 MPa (140 ksi) typ. 1170 ± 50 MPa (170 ± 7 ksi) |
typ. 1210 ± 50 MPa (175 ± 7 ksi) |
| Yield strength (Rp 0.2 %) [7] in vertical direction (Z) | - - - - - - - |
min. 862 MPa (125 ksi) typ. 970 ± 50 MPa (141 ± 7 ksi) |
typ. 1010 ± 50 MPa (146 ± 7 ksi) |
| Elongation at break [7] in vertical direction (Z) | - - - - - - - |
min. 6 % typ. (16 ± 3) % |
typ. (20 ± 3) % |
| Stress-Rupture Properties [8] in vertical direction (Z) | - - - - - - - |
min. 23 hours at stress level 689 MPa (100 ksi) |
- - - - - - - |
|
51 ± 5 hours (final applied stress to rupture 792.5 MPa / 115 ksi) |
81 ± 10 hours (final applied stress to rupture 861.5 MPa / 125 ksi) |
| Thermal properties of parts | Test Method | Heat treated per AMS 5662 |
| Coefficient of thermal expansion over 25 - 200 °C (36 - 390 °F) | - - - - - - - | approx. 12.5 - 13.0 x 10-6 m/m°C |
| Coefficient of thermal expansion over 25 - 750 °C (36 - 930 °F) | - - - - - - - | approx. 16.6 - 17.2 x 10-6 m/m°C |
| Maximum operating temperature for parts under load | - - - - - - - |
approx. 650 °C approx. 1200 °F |
| Oxidation resistance up to | - - - - - - - |
980 °C 1800 °F |