Inconel 718 alloy
Inconel 718 is a nickel-chromium alloy that contains supplemental amounts of columbium, iron, molybdenum, aluminum, and titanium. It is also known as nickel alloy 718
The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to postweld cracking, are outstanding. The ease and economy with which INCONEL alloy 718 can be fabricated, combined with good tensile, fatigue, creep, and rupture strength, have resulted in its use in a wide range of applications
How do the heat treatment processes affect the mechanical properties of Inconel 718?
Heat treatment processes significantly influence the mechanical properties of Inconel 718, enhancing its strength, ductility, and overall performance. Here’s how different heat treatment processes affect its properties:
1. Solution Annealing
Process: Involves heating the alloy to a temperature of approximately 1,600°F (870°C) and holding it for a specified time, followed by rapid cooling.
Effects:
Dissolves precipitates and homogenizes the microstructure.
Improves ductility and toughness.
Reduces residual stresses from prior processing.
2. Age Hardening (Aging)
Process: After solution annealing, the alloy is aged at temperatures between 1,200°F (650°C) and 1,300°F (700°C) for several hours.
Effects:
Promotes the precipitation of gamma double-prime (γ'') and gamma prime (γ') phases, which enhance strength and hardness.
Significantly increases yield and tensile strength while maintaining good ductility.
Improves fatigue resistance, making it ideal for high-stress applications.
3. Stress Relieving
Process: Involves heating to a lower temperature (around 1,000°F or 540°C) to relieve internal stresses without significantly altering the microstructure.
Effects:
Reduces residual stresses that may lead to distortion during machining or service.
Enhances dimensional stability.
4. Cryogenic Treatment
Process: Involves cooling the alloy to cryogenic temperatures (below -300°F or -184°C) and then returning it to room temperature.
Parameter:
Chemical Properties of Inconel 718
Nickel (plus Cobalt) .......................................................50.00-55.00
Chromium......................................................................17.00-21.00
Iron .....................................................................................Balance
Niobium (plus Tantalum)....................................................4.75-5.50
Molybdenum .....................................................................2.80-3.30
Titanium.............................................................................0.65-1.15
Aluminum ..........................................................................0.20-0.80
Cobalt ...............................................................................1.00 max.
Carbon..............................................................................0.08 max.
Manganese .......................................................................0.35 max.
Silicon ...............................................................................0.35 max.
Phosphorus.....................................................................0.015 max.
Sulfur...............................................................................0.015 max.
Boron ..............................................................................0.006 max.
Copper..............................................................................0.30 max
| Density | 8.19g/cm³ | 0.296 lb/in³ |
| Melting point | 1260-1336 | 2437°F |
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Billet and bar for reforging | |
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Inconel series
| Steel grade | Inconel 600 | Inconel 601 | Inconel 625 | Inconel 718 | Inconel 725 | Inconel X-750 |
| Corresponding brand | N06600/2.4816/1Cr15Ni75Fe8/NS312/CY40 | N06601/2.4851/1Cr23Ni60Fe13AI/NS313 | N06625/2.4856/0Cr20Ni65Mo10bN4/NS336 | N07718/2.4668/GH4169 | N07725 | N07750/2.4669/GH4145 |
| Chemical composition% |
| C≤ | 0.150 | 0.100 | 0.100 | 0.080 | 0.030 | 0.080 |
| Mn≤ | 1.00 | 1.00 | 0.50 | 0.35 | 0.35 | 1.00 |
| P≤ | / | / | 0.015 | 0.015 | 0.015 | / |
| S≤ | 0.015 | 0.015 | 0.015 | 0.015 | 0.010 | 0.010 |
| Si≤ | 0.50 | 0.50 | 0.50 | 0.35 | 0.20 | 0.50 |
| Cr≤ | 14.0-17.0 | 21.0-25.0 | 20.0-23.0 | 17.0-21.0 | 19.0-22.5 | 14.0-17.0 |
| Ni≤ | ≥72.0 | 58.0-63.0 | ≥58.0 | 55.0-59.0 | 55.0-59.0 | ≥70 |
| Mo | / | / | 8.0-10.0 | 2.8-3.3 | 7.0-9.5 | / |
| Cu | ≤0.50 | ≤1.50 | / | ≤0.30 | / | ≤0.50 |
| N | / | / | / | | / | / |
| Nb | / | / | 3.15-4.15 | 4.75-5.50 | 2.75-4.00 | 0.70-1.20 |
| other | Fe:6.0-10.0 | Al:1.0-1.7 | Co:≤1.0Ai:≤0.40Tr:0.40Fe:≤5.0 | AI:0.20-0.80Ti:0.65-1.15B≤0.006 | Tr:1.0-1.7AI≤0.35 | Co:≤1.0 AI:0.4-1.0Tr:0.25-2.75Fe:5.0-9.0 |
Customize size as below
| Shape | Size(mm) |
| WIre | 0.5-7.5 |
| Rod/Bar | 8.0-200 |
| Strip | (0.5-2.5)*(5-180) |
| Tube | custom made |
| Plate | custom made |
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