Nickel Alloy Rene 80-AC (Spheroidize annealed)
Heat-treated state
also 5401
Pick for non-critical hardware or as the intermediate state before solution/age; coarse as-cast γ′ gives lower ductility and rupture life.
Values for the AC condition
Other Rene 80 tempers and conditions
Rene 80 is listed in 5 conditions; see the grade overview at Rene 80.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ACThis page Spheroidize annealed | Pick for non-critical hardware or as the intermediate state before solution/age; coarse as-cast γ′ gives lower ductility and rupture life. | 780 | 900 | 4 | 36 HRC | 1.3 % IACS |
Directionally solidified + full heat treatment | Columnar-grain casting for higher thermal-fatigue life and transverse-free creep loading in axial turbine blades. | 840 | 1,000 | 11 | 38 HRC | 1.3 % IACS |
Rene 80H | Hf-bearing modification (~0.7–1.2 % Hf) chosen for improved casting ductility, hot-tear resistance and coating adherence. | 840 | 1,010 | 9 | 38 HRC | 1.3 % IACS |
HTDefault Full heat treatment | Standard supply condition for equiaxed investment-cast blades and vanes — optimum γ′ size distribution and creep-rupture life. | 855 | 1,030 | 6 | 39 HRC | — |
Hot isostatic pressing then full heat treatment | Choose when microporosity must be closed for maximum LCF/creep-rupture scatter control in flight-critical blades. | 870 | 1,070 | 9 | 39 HRC | 1.3 % IACS |
What is Rene 80-AC?
Rene 80-AC is Rene 80 heat treated to AC — pick for non-critical hardware or as the intermediate state before solution/age; coarse as-cast γ′ gives lower ductility and rupture life. Rene 80-AC has a yield strength of 780 MPa (113 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 83% of nickel alloy grades. Elongation at break is 4% and the elastic modulus is 199 GPa (28.9 Msi). Rene 80-AC has a density of 8.16 g/cm³ (0.295 lb/in³), lighter than 73% of nickel alloy grades. It melts at 1,260°C (2,300 °F). HT is the default condition FabDigit quotes; AC is available on request or by drawing note.
Advantages
- High strength — 780 MPa (113 ksi), better than 83% of nickel alloy grades
Limitations
- Limited formability — 2/100, worse than 99% of nickel alloy grades
- Limited ductility — 4%, worse than 93% of nickel alloy grades
- Low fracture toughness — 65 MPa·√m (59.2 ksi·√in), worse than 88% of nickel alloy grades
- Difficult to weld — 15/100, worse than 87% of nickel alloy grades
- High embodied carbon — 15 kg CO₂/kg, worse than 87% of nickel alloy grades
Rene 80-AC properties
Typical room-temperature values for Rene 80-AC; 21 are specific to this condition. Other listed values are Rene 80 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Rene 80-AC has a density of 8.16 g/cm³ (0.295 lb/in³), lighter than 73% of nickel alloy grades. It melts at 1,260°C (2,300 °F).
Mechanical14
Rene 80-AC has a yield strength of 780 MPa (113 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 83% of nickel alloy grades. Elongation at break is 4% and the elastic modulus is 199 GPa (28.9 Msi).
Thermal6
Rene 80-AC is rated for continuous service to 870°C (1,598 °F). It conducts heat at 10.2 W/m·K (5.89 BTU/hr·ft·°F), worse than 79% of nickel alloy grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
Rene 80-AC conducts electricity at 1.3 % IACS, worse than 89% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is good (64/100), worse than 85% of nickel alloy grades.
Sustainability4
Producing a kilogram of Rene 80-AC takes about 230 MJ of energy and emits 15 kg of CO₂ — more than 91% of nickel alloy grades. Typical recycled content is 25%.
Manufacturability8
Rene 80-AC's machinability is not recommended (13/100, worse than 82% of nickel alloy grades); weldability poor (15/100); formability not recommended (2/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Rene 80-AC
Is Rene 80 easy to machine?
Very difficult — creep-feed grinding, EDM and ECM dominate; if turning/milling, use rigid setups, ceramic or coated carbide at low speed with heavy flood coolant.
Can Rene 80 be welded?
Poor fusion weldability due to ~45 % γ′; repair only by pre-heat/hot-box GTAW with ductile Ni fillers, laser cladding or wide-gap TLP brazing, followed by full re-heat treatment.
Can Rene 80 be formed, bent or molded?
Not forgeable or formable — vacuum investment casting (equiaxed or DS) with controlled shell preheat and grain refinement; HIP recommended to close microporosity.
What surface finishes work on Rene 80?
Grit blast plus chemical/abrasive-flow deburring; service parts receive aluminide or Pt-aluminide diffusion coatings, MCrAlY overlays and thermal barrier ceramic topcoats — no anodizing.
Rene 80 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cr | 13.7 – 14.3 | 14 |
| Co | 9 – 10 | 9.5 |
| Mo | 3.7 – 4.3 | 4 |
| W | 3.7 – 4.3 | 4 |
| Ti | 4.7 – 5.3 | 5 |
| Al | 2.8 – 3.2 | 3 |
| C | 0.15 – 0.19 | 0.17 |
| B | 0.01 – 0.02 | 0.02 |
| Zr | 0.02 – 0.1 | 0.03 |
| Hf0.7–1.2 % only in the Rene 80H modification | 0 – 1.2 | 0 |
| Feimpurity limit | ≤ 0.35 | — |
| Siimpurity limit | ≤ 0.2 | — |
| Mnimpurity limit | ≤ 0.2 | — |
| Simpurity limit | ≤ 0.02 | — |
| Nibalance, approx. 60 % | balance | — |
Rene 80-AC — frequently asked
What is Rene 80-AC used for?
Rene 80-AC is typically used for industrial gas turbine blades, aircraft engine vanes, high-pressure turbine blades, equiaxed and DS, nozzle guide vane segments, blade tip shrouds and hot-section castings for turboshaft engines. In short: high creep-rupture cast alloy; 45 % γ′ blade grade; repair by braze only.
What is the yield strength of Rene 80-AC?
Rene 80-AC has a typical yield strength of 780 MPa (113 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 83% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Rene 80-AC easy to machine?
Not especially — machinability is rated not recommended (13/100, worse than 82% of nickel alloy grades). Very difficult — creep-feed grinding, EDM and ECM dominate; if turning/milling, use rigid setups, ceramic or coated carbide at low speed with heavy flood coolant.
Can Rene 80-AC be welded?
Not readily — weldability is rated poor (15/100). Poor fusion weldability due to ~45 % γ′; repair only by pre-heat/hot-box GTAW with ductile Ni fillers, laser cladding or wide-gap TLP brazing, followed by full re-heat treatment.
What surface finishes work on Rene 80-AC?
Grit blast plus chemical/abrasive-flow deburring; service parts receive aluminide or Pt-aluminide diffusion coatings, MCrAlY overlays and thermal barrier ceramic topcoats — no anodizing.
Can Rene 80-AC be formed, bent or molded?
Not forgeable or formable — vacuum investment casting (equiaxed or DS) with controlled shell preheat and grain refinement; HIP recommended to close microporosity.
What is the maximum service temperature of Rene 80-AC?
Rene 80-AC is rated for continuous use to about 870°C (1,598 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Rene 80-HT and Rene 80-AC?
HT is the default condition — standard supply condition for equiaxed investment-cast blades and vanes — optimum γ′ size distribution and creep-rupture life. AC: pick for non-critical hardware or as the intermediate state before solution/age; coarse as-cast γ′ gives lower ductility and rupture life. Yield strength is 855 MPa in HT versus 780 MPa in AC.
Sources
- AMS 5401 — Nickel Alloy, Corrosion and Heat Resistant, Investment Castings (Rene 80) — SAE International (2018)
- Superalloys II: High-Temperature Materials for Aerospace and Industrial Power — Wiley (1987)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Specialty Handbook: Heat-Resistant Materials — ASM International (1997)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.