Alloy 102 IN-102 | N06102 | Precipitation Superalloy | AMS 5758 | Fushun Metal

Alloy 102 / IN-102 / N06102 — Introduction

Alloy 102 (IN-102), designated UNS N06102, is a precipitation-hardening nickel-chromium-cobalt-molybdenum superalloy engineered for sustained structural service at temperatures up to 980°C. It belongs to the class of high-gamma-prime-volume-fraction nickel superalloys that derive their exceptional high-temperature tensile and creep-rupture strength from a dense, thermally stable distribution of gamma-prime (Ni₃(Al,Ti)) precipitates, reinforced by solid-solution hardening from 8–10% cobalt and 8–10% molybdenum. With aluminum and titanium each in the 2.5–3.5% range—yielding a combined Al+Ti of approximately 5–7%—IN-102 produces one of the highest gamma-prime volume fractions among wrought superalloys, placing it in the same performance tier as Rene 41 and Nimonic 90A for gas turbine hot-section rotating and static components. The alloy is qualified under AMS 5758, ASTM/ASME B637, General Electric specifications S106M and S506M, and Pratt & Whitney PWA 1104—confirming its pedigree in flight-critical and industrial gas turbine applications where mechanical failure at temperature is not an acceptable outcome.

At Fushun Metal, Alloy 102 is manufactured through a fully integrated triple-melt route under one roof. VIM primary melting under high vacuum is mandatory for this alloy class: the high aluminum and titanium additions that drive gamma-prime precipitation are violently reactive with oxygen, and any oxide inclusion formed during melting acts as a fatigue-initiation site in rotating components. The VIM electrode passes to VAR, where controlled directional solidification eliminates macro-segregation and produces the chemically homogeneous, inclusion-free microstructure required by AMS 5758 and prime contractor specifications. The alloy’s high solute content (Al+Ti+Mo+Co ≈ 25%) makes it inherently prone to segregation; VAR remelting is the only proven commercial route to the microstructural uniformity demanded by turbine disc and blade applications. For the most critical rotating-grade requirements, we deploy PESR as the final stage for maximum cleanliness and isotropic properties.

Every heat is processed, forged, heat-treated, and tested within Fushun Metal’s certified quality management system—ISO 9001 for manufacturing process control and AS9120B for aerospace distribution traceability. The alloy’s four-step heat treatment cycle—solution at 1150°C, primary age at 1080°C, secondary age at 845°C, and tertiary age at 760°C—is executed entirely in-house under calibrated furnace controls with full time-temperature data logging for each production lot. Digital traceability links every component from melt heat number through remelt sequence, forging reduction ratio, and heat treatment batch to the final mill test certificate. Ultrasonic inspection per AMS 2375, dye-penetrant testing, mechanical test coupons at room and elevated temperature, and chemical re-verification are standard on every order. Certificates to EN 10204 3.1 or 3.2 accompany every shipment.

Equivalent Grades & Applicable Standards of Alloy 102

Alloy 102 (IN-102) is primarily a U.S.-origin alloy codified under ASTM/AMS specifications and major OEM standards. No direct European DIN/EN, French AFNOR, Japanese JIS, or Chinese GB registered equivalents exist for this grade. The table below documents the applicable specifications to which Fushun Metal certifies. All material can be dual-certified where overlapping specifications permit.

Applications of Alloy 102

Alloy 102 is specified for the most demanding hot-section components in gas turbine engines—both aero and industrial—where the simultaneous requirements of creep-rupture life, low-cycle fatigue resistance, and oxidation resistance at metal temperatures approaching 980°C exceed the capability of lower-gamma-prime-volume-fraction alloys such as Inconel 718 and Waspaloy. It is typically supplied in forged and heat-treated condition for machining into finished rotating and static components.

Alloy 102 — Supply Range by Fushun Metal

Fushun Metal produces Alloy 102 across forged and rolled product forms from a single integrated facility. Our in-house 6000-ton hydraulic open-die press and 1800-ton precision radial forger (GFM) are the primary production routes for this alloy, as its high gamma-prime content makes it inherently suited to forging rather than extensive rolling. All material is supplied in the fully heat-treated condition per AMS 5758—solution-annealed at 1150°C and triple-aged at 1080°C + 845°C + 760°C—unless the customer specifies solution-annealed-only for subsequent forming and in-house heat treatment. The four-step cycle is executed under full time-temperature logging. Ultrasonic inspection per AMS 2375 Class A, dye-penetrant testing, and mechanical test coupons at room and elevated temperature are standard. Mill test certificates to EN 10204 3.1 or 3.2. Matching filler metals available for weld repair.

Chemical Composition of Alloy 102 — AMS 5758 / ASTM B637

All heats produced by Fushun Metal are melted via VIM+VAR or VIM+PESR and verified against the composition limits below by optical emission spectrometry and LECO combustion analysis. Full chemical certificates are issued with every shipment under ISO 9001 and AS9120B quality management. The defining compositional characteristic of IN-102 is the high combined aluminum-plus-titanium content (5–7% total), which drives a gamma-prime volume fraction that places this alloy in the upper tier of wrought superalloy performance. Boron (0.005–0.015%) and zirconium (0.05–0.10%) are present as deliberate grain-boundary-strengthening microalloying additions that improve creep ductility and notch rupture life.

Mechanical Properties of Alloy 102 — Fully Heat-Treated Condition

Alloy 102 achieves its design properties through a precisely controlled four-step heat treatment: solution annealing at 1150°C ± 10°C (air cool), primary aging at 1080°C ± 10°C for 4 hours (air cool), secondary aging at 845°C ± 10°C for 24 hours (air cool), and tertiary aging at 760°C ± 10°C for 16 hours (air cool). This multi-step sequence optimizes the gamma-prime size distribution into a bimodal population—coarse primary gamma-prime for creep resistance and fine secondary/tertiary gamma-prime for tensile strength—while also developing the grain-boundary carbide network that provides creep ductility and notch-rupture resistance.

Fushun Metal executes the full heat treatment cycle in-house under calibrated furnace controls per AMS 2750 pyrometry requirements. Forging is performed at 1050–1150°C. The alloy requires specialized machining practices typical of high-strength nickel superalloys: rigid setups, sharp carbide tooling, low cutting speeds, and abundant coolant. All mechanical testing is conducted on specimens heat-treated with their parent production lot to ensure representative results. Stress-rupture testing at 815°C / 310 MPa is a standard quality-assurance test for rotating-grade material.

Physical constants: Density 8.10 g/cm³; Melting range 1260–1340°C; Hardness 34–42 HRC (fully aged condition); Modulus of elasticity 215 GPa at 20°C; Thermal conductivity 14.2 W/m·K at 800°C; Coefficient of thermal expansion 13.8 μm/m·°C (20–1000°C). Continuous maximum service temperature: 980°C; oxidation resistance rated to 1100°C. The alloy is essentially non-magnetic.