What Material is GH2132 Superalloy - Knowledge

1. What Material is GH2132 Superalloy?

GH2132 is a nickel-iron-based precipitation-hardening superalloy, also known as "A-286" in international standards. Its core strengthening mechanism relies on the precipitation of intermetallic compounds (mainly γ' phase, i.e., Ni₃(Ti, Al)) during heat treatment, which significantly enhances its high-temperature strength.

This alloy combines the advantages of nickel-based and iron-based superalloys. It has excellent creep resistance and fatigue resistance at medium to high temperatures (up to 650–700°C), along with good oxidation resistance and corrosion resistance in harsh environments (such as high-temperature gases and seawater). It also features outstanding cold and hot workability, making it widely used in aerospace, power generation, and petrochemical industries. Typical applications include high-temperature fasteners, turbine disks, blades, and structural components for aircraft engines, gas turbines, and nuclear reactors.

2. What is the chemical composition of GH2132 Superalloy?

The chemical composition of GH2132 is precisely formulated to ensure its precipitation hardening effect and comprehensive performance. The following table shows its typical nominal composition (by weight percentage, wt%):

Element	Content Range (wt%)	Function
Nickel (Ni)	24.0 – 27.0	Main alloying element; forms the matrix and participates in the precipitation of γ' phase.
Iron (Fe)	Balanced	Base element; reduces cost while maintaining the alloy's structural stability.
Chromium (Cr)	13.5 – 16.0	Improves high-temperature oxidation resistance and corrosion resistance.
Molybdenum (Mo)	1.0 – 1.5	Enhances solid-solution strengthening and creep resistance.
Titanium (Ti)	1.75 – 2.30	Key element for precipitation hardening; forms γ' phase (Ni₃Ti) to improve strength.
Aluminum (Al)	0.10 – 0.50	Cooperates with titanium to form γ' phase; fine-tunes the precipitation effect.
Vanadium (V)	0.10 – 0.50	Promotes grain refinement; enhances the stability of γ' phase at high temperatures.
Carbon (C)	0.08 – 0.16	Forms carbides (e.g., TiC); improves wear resistance and high-temperature strength.
Manganese (Mn)	≤ 2.00	Improves hot workability and deoxidation during smelting.
Silicon (Si)	≤ 1.00	Assists in deoxidation; slightly improves oxidation resistance.
Boron (B)	≤ 0.005	Strengthens grain boundaries; reduces intergranular cracking risk at high temperatures.
Phosphorus (P)	≤ 0.030	Impurity element; strictly limited to avoid reducing ductility.
Sulfur (S)	≤ 0.020	Impurity element; strictly limited to prevent hot brittleness.

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3. What is the hardness of GH2132 Superalloy?

The hardness of GH2132 is highly dependent on its heat treatment process, as precipitation hardening is the key to its strength. Below are the typical hardness values for different heat treatment states:

Solution Annealing State : After solution treatment (heating to 980–1000°C and rapid cooling), the alloy's structure is uniform, and precipitated phases are dissolved. The hardness is relatively low, typically HB 190 – 220 or HV 200 – 230, which is suitable for subsequent processing (e.g., forging, machining).

Aging Hardening State : After solution treatment, aging at 700–720°C for a certain period promotes the uniform precipitation of γ' phase. This state achieves the highest hardness, usually HB 340 – 380 or HV 350 – 400, and the alloy reaches its optimal high-temperature strength and creep resistance.

Cold-Worked + Aging State : Cold working (e.g., cold rolling, drawing) before aging further refines the grain and increases the density of precipitation sites. The hardness can be slightly higher than the single aging state, reaching HB 360 – 400 or HV 370 – 420, with better surface hardness and wear resistance.

Hardness testing of GH2132 typically adheres to standards such as ASTM E10 (Brinell Hardness) or ASTM E92 (Vickers Hardness) to ensure data accuracy.