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R31538 Cobalt vs. Nickel 685

R31538 cobalt belongs to the cobalt alloys classification, while nickel 685 belongs to the nickel alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is nickel 685.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 23
17
Fatigue Strength, MPa 310 to 480
470
Poisson's Ratio 0.29
0.29
Reduction in Area, % 13 to 22
20
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
1250
Tensile Strength: Yield (Proof), MPa 580 to 930
850

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1380
Melting Onset (Solidus), °C 1290
1330
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 8.1
10
Embodied Energy, MJ/kg 110
140
Embodied Water, L/kg 530
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
190
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
1820
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 34 to 45
42
Strength to Weight: Bending, points 27 to 32
31
Thermal Diffusivity, mm2/s 3.5
3.3
Thermal Shock Resistance, points 25 to 33
37

Alloy Composition

Aluminum (Al), % 0
1.2 to 1.6
Boron (B), % 0
0.0030 to 0.010
Carbon (C), % 0.15 to 0.35
0.030 to 0.1
Chromium (Cr), % 26 to 30
18 to 21
Cobalt (Co), % 58.7 to 68.9
12 to 15
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 0 to 0.75
0 to 2.0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
3.5 to 5.0
Nickel (Ni), % 0 to 1.0
49.6 to 62.5
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0
2.8 to 3.3
Zinc (Zn), % 0
0.020 to 0.12