Vacuum Heat Treatment Process of Nickel-Base Superalloy GTD222

GTD222 is a nickel-based superalloy designed specifically for high-temperature components—such as gas turbine blades and turbine disks—and is characterized by its excellent high-temperature strength, oxidation resistance, and corrosion resistance.

The typical vacuum heat treatment process for GTD222 (a nickel-based, precipitation-strengthened cast superalloy) is as follows:

• Solution Treatment: Hold at 1150 ± 10°C for 40–60 minutes under vacuum or argon protection (to prevent oxidation), followed by rapid cooling (gas quenching) or air cooling (depending on component dimensions and deformation tolerance requirements).
• Aging Treatment: Hold at 760–800°C for 8–16 hours, followed by air cooling.
• Vacuum Environment Requirements: The vacuum level within the furnace is typically maintained at ≤ 1 × 10⁻² Pa to prevent surface oxidation and decarburization; this is particularly suitable for high-purity components such as aviation turbine stator parts (e.g., combustion liners and nozzles).

Selection of Vacuum Heat Treatment Furnace Type

• Recommended Furnace Type: Horizontal or vertical vacuum high-pressure gas quenching furnace. This type is suitable for the production of gas turbine components involving small-to-medium batch sizes, high reliability requirements, and long-profile parts (such as blades); it facilitates high-temperature solution treatment followed by high-pressure gas cooling.
• Heating Elements & Thermal Insulation Shields: GTD222 is a cobalt-based superalloy that is sensitive to carbon pickup (carburization). If the process requires strict control over carbon content, it is necessary to evaluate whether a graphite-rich atmosphere might introduce trace amounts of carbon; therefore, the selection of graphite heating elements and graphite thermal insulation shields should be approached with caution. Optional Configuration: Molybdenum Heating Elements + Metal Thermal Shields
• Maximum Operating Temperature: 1300°C
• Common Processes: 1150°C (Solution Treatment), 800°C (Aging), 650°C (Stress Relieving)
• Temperature Control Accuracy: ±1°C
• Furnace Temperature Uniformity: ≤±5°C

Vacuum System

• Ultimate Vacuum Level: ≤5×10⁻³ Pa
• Operating Vacuum Level: <600°C: 1–5 Pa (Low Vacuum + Slight Ar Positive Pressure); ≥800°C: ≤1×10⁻³ Pa (High Vacuum)
• Pressure Rise Rate: ≤0.5 Pa/h

Cooling System (Cooling rate during solution treatment determines material toughness)

• Cooling Medium: High-Purity Ar (99.999%)
• Gas Quenching Pressure: 5–8 bar (Absolute Pressure)
• Cooling Rate: ≥15°C/min (from 800°C to 500°C)

Control System

• PLC + Fully Automatic Control
• Multi-Zone Independent Temperature Control (≥3 zones)
• Process Curve Storage: ≥100 process curves
• Data Recording: Comprehensive recording of temperature, vacuum level, pressure, and time; data is exportable.
• Alarms & Interlocks: Over-temperature, low vacuum, water pressure, gas pressure, phase loss, etc.

About Vaccum Furnace Manufacturer

The RVGQ series vacuum gas quenching furnaces manufactured by SIMUWU are premium products designed for the vacuum heat treatment of materials such as tool steel, mold steel, high-speed steel, and ultra-high-strength steel. Their exceptional temperature control accuracy and uniformity ensure the effective execution of the vacuum gas quenching process. Users may choose between metal or graphite heating elements; furthermore, the electrical components within the control system are sourced from internationally renowned brands, guaranteeing superior quality. The vacuum system utilizes vacuum pumps from leading domestic and international manufacturers, ensuring excellent performance and safeguarding the equipment’s vacuum integrity. SIMUWU specializes in the manufacturing of vacuum furnaces, boasting over a decade of relevant experience and a sterling reputation within the industry. Our product line encompasses vacuum gas quenching furnaces, vacuum oil quenching furnaces, vacuum brazing furnaces, and more, with products widely exported to both developed and developing nations.

If you would like to learn more about our vacuum furnace equipment, please send your requirements to kevin.liu@vacfurnace.com, and our company will provide you with a satisfactory solution.