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Nickel 684 vs. SAE-AISI 4718 Steel

Nickel 684 belongs to the nickel alloys classification, while SAE-AISI 4718 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is nickel 684 and the bottom bar is SAE-AISI 4718 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
150
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
24
Fatigue Strength, MPa 390
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
73
Shear Strength, MPa 710
330
Tensile Strength: Ultimate (UTS), MPa 1190
510
Tensile Strength: Yield (Proof), MPa 800
370

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Maximum Temperature: Mechanical, °C 1000
420
Melting Completion (Liquidus), °C 1370
1460
Melting Onset (Solidus), °C 1320
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 75
3.0
Density, g/cm3 8.3
7.9
Embodied Carbon, kg CO2/kg material 10
1.6
Embodied Energy, MJ/kg 140
21
Embodied Water, L/kg 360
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1610
360
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 40
18
Strength to Weight: Bending, points 30
18
Thermal Shock Resistance, points 34
17

Alloy Composition

Aluminum (Al), % 2.5 to 3.3
0
Boron (B), % 0.0030 to 0.010
0
Carbon (C), % 0 to 0.15
0.16 to 0.21
Chromium (Cr), % 15 to 20
0.35 to 0.55
Cobalt (Co), % 13 to 20
0
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 4.0
96.3 to 97.4
Manganese (Mn), % 0 to 0.75
0.7 to 0.9
Molybdenum (Mo), % 3.0 to 5.0
0.3 to 0.4
Nickel (Ni), % 42.7 to 64
0.9 to 1.2
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 0.75
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040
Titanium (Ti), % 2.5 to 3.3
0