GH4099 Superalloy Powder for SLM

Category	Parameter	Value / Range
Typical Applications	Suitable Components	High-temperature welded structures: aero-engine combustion chambers, afterburners, and other hot-section components
Applicable Processes	Additive Manufacturing	SLM (Selective Laser Melting)
Chemical Composition (wt.%)	Ni	Balance
	Cr	17.0–20.0
	Co	5.0–8.0
	W	5.0–7.0
	Mo	3.5–4.5
	Al	1.7–2.4
	Ti	1.0–1.5
	C	≤ 0.08
	Mg	≤ 0.01
	Ce	≤ 0.02
	B	≤ 0.005
	Fe	≤ 2.0
	P	≤ 0.015
	S	≤ 0.015
	Mn	≤ 0.4
	Si	≤ 0.5
	O	≤ 0.02
	N	≤ 0.02
Physical Properties	Particle Size (D10 / D50 / D90)	≥15 μm / 30–40 μm / ≤60 μm
	Sphericity	≥ 0.9
	Apparent Density (g/cm³)	≥ 4.4
	Tap Density (g/cm³)	≥ 5.0
	Flowability (s/50g)	≤ 18
Mechanical Properties (Heat-Treated)	Test Temperature	Room Temp / 900°C
	Tensile Strength (MPa)	≥ 1050 / ≥ 400
	Yield Strength (MPa)	≥ 700 / ≥ 350
	Elongation (%)	≥ 15.0 / ≥ 15.0

1. Advantages and Features of This GH4099 Superalloy Powder

1.1 Optimized for Industrial Applications

GH4099 powder is a specialized nickel-based superalloy designed specifically for the most demanding high-temperature environments in the aerospace industry. It is uniquely optimized for manufacturing critical hot-section components, particularly aero-engine combustion chambers and afterburners. Its ability to maintain structural integrity under extreme thermal cycling makes it indispensable for next-generation propulsion systems. GH4099 (Chinese designation; equivalent to UNS N07001 / Waspaloy-type high-temperature cobalt-nickel-based superalloy).

1.2 Excellent SLM Processability

Engineered for precision additive manufacturing, this powder exhibits superior flowability ( $\leq$ ≤ 18 s/50g) and high tap density ( $\geq$ ≥ 5.0 g/cm³). These physical properties ensure uniform powder spreading during the SLM process, minimizing defects such as porosity or lack-of-fusion, which is critical for producing leak-tight and structurally sound combustion chamber components.

1.3 Robust Mechanical Performance

GH4099 demonstrates exceptional mechanical strength at elevated temperatures. In the heat-treated condition, it achieves a room temperature tensile strength of $\geq$ ≥ 1050 MPa and retains significant load-bearing capacity at 900°C with a yield strength of $\geq$ ≥ 350 MPa. This performance profile ensures reliability in high-stress, high-heat operational zones.

1.4 Stable Physical Properties

The powder features a highly spherical morphology ( $\geq$ ≥ 0.9) with a controlled particle size distribution (D50: 30–40 μm). This consistency guarantees stable laser absorption and melt pool dynamics, resulting in predictable microstructures and consistent mechanical properties across complex geometries.

1.5 High Purity & Compositional Control

Strict control over impurities is maintained, with low levels of Oxygen ( $\leq$ ≤ 0.02%) and Nitrogen ( $\leq$ ≤ 0.02%). The precise balance of strengthening elements like Tungsten (W), Molybdenum (Mo), and Aluminum (Al) ensures optimal precipitation hardening potential without compromising weldability or ductility.

2. GH4099 Superalloy Powder Material Overview

2.1 Chemical Composition Characteristics

GH4099 is a solid-solution strengthened nickel-based alloy. Key compositional highlights include:

Nickel (Ni): Balance, providing the austenitic matrix stability.
Chromium (Cr): 17.0–20.0%, ensuring oxidation resistance.
Tungsten (W) & Molybdenum (Mo): 5.0–7.0% and 3.5–4.5% respectively, providing solid solution strengthening.
Aluminum (Al) & Titanium (Ti): 1.7–2.4% and 1.0–1.5%, contributing to gamma-prime ( $γ^{'}$ γ′ ) precipitation hardening.
Trace Elements: Controlled Boron (B) and Magnesium (Mg) enhance grain boundary strength.

2.2 Powder Characteristics

The powder is produced via gas atomization to achieve a clean, satellite-free surface. With an apparent density of $\geq$ ≥ 4.4 g/cm³ and a narrow particle size range (D10 $\geq$ ≥ 15 μm, D90 $\leq$ ≤ 60 μm), it is perfectly tailored for fine-layer SLM printing, allowing for high-resolution feature definition required in intricate cooling channel designs.

3. Technical Advantages

High-Temperature Weldability: Unlike many precipitation-hardened superalloys prone to cracking, GH4099 offers excellent weldability, making it ideal for repairing or joining additively manufactured parts.
Oxidation Resistance: The high Chromium content provides a protective oxide scale at operating temperatures up to 900°C.
Creep Resistance: The combination of W, Mo, and Al/Ti phases offers superior resistance to deformation under constant stress at high temperatures.

4. SLM Process Parameter Recommendations

To achieve full density and minimize residual stress in GH4099:

Laser Power: Typically 200–300 W (dependent on spot size).
Scan Speed: 600–1000 mm/s.
Hatch Spacing: 0.08–0.12 mm.
Layer Thickness: 30–40 μm recommended for optimal surface finish and density.
Pre-heating: Base plate pre-heating to 200–400°C is often recommended to reduce thermal gradients and prevent cracking.
Atmosphere: Argon atmosphere with oxygen content < 0.1%.

5. Post-Processing Procedures

As-built GH4099 parts typically require heat treatment to relieve residual stresses and optimize mechanical properties:

Stress Relief: Immediate stress relief annealing after printing.
Solution Treatment: Heating to approx. 1080°C – 1120°C followed by rapid cooling (air or water quench) to dissolve precipitates.
Aging: Two-step aging (e.g., 900°C for 8h + 800°C for 8h) to precipitate the strengthening $γ^{'}$ γ′ phase.
HIP (Optional): Hot Isostatic Pressing may be used for critical flight parts to eliminate internal microporosity.

6. Performance Specifications (Heat-Treated Condition)

Property	Test Temperature	Value
Tensile Strength	Room Temperature	$\geq$ ≥ 1050 MPa
Yield Strength	Room Temperature	$\geq$ ≥ 700 MPa
Elongation	Room Temperature	$\geq$ ≥ 15.0%
Tensile Strength	900°C	$\geq$ ≥ 400 MPa
Yield Strength	900°C	$\geq$ ≥ 350 MPa
Elongation	900°C	$\geq$ ≥ 15.0%

7. Application Areas

Aero-Engines: Combustion chambers, flame holders, afterburner liners, exhaust nozzles.
Gas Turbines: Transition ducts, high-temperature seals.
Automotive: High-performance exhaust manifolds and turbocharger components.
Industrial: High-temperature fixtures and tooling.

8. Comparison with Similar Powders

Vs. IN625: GH4099 generally offers higher strength at temperatures above 700°C due to its precipitation hardening mechanism (Al/Ti), whereas IN625 relies mainly on solid solution strengthening. However, IN625 has better corrosion resistance in aqueous environments.
Vs. IN718: GH4099 has better oxidation resistance and higher temperature capability than IN718 but is generally harder to machine and weld compared to IN718.
Vs. Haynes 230: GH4099 is stronger at intermediate temperatures (700-900°C), while Haynes 230 excels in pure oxidation resistance and very high-temperature stability (>1000°C).

9. Precautions

Cracking Sensitivity: While weldable, GH4099 can be sensitive to strain-age cracking if heated too rapidly during post-processing. Controlled heating rates are essential.
Powder Handling: Always handle in an inert environment or dry box to prevent moisture uptake, which leads to hydrogen porosity.
Support Structures: Due to high thermal expansion, robust support structures are necessary to prevent warping during the build.

10. Summary

GH4099 superalloy powder represents a high-performance solution for SLM applications requiring superior strength and oxidation resistance at temperatures approaching 900°C. Its balanced chemistry allows for the fabrication of complex, welded structures like combustion chambers that were previously impossible to manufacture with traditional methods. With proper process control and heat treatment, it delivers aerospace-grade reliability.
Forgecise offers premium GH4099 powder, a specialized nickel-based superalloy engineered specifically for demanding additive manufacturing materials applications. As a leading SLM metal powder, this material is the industry standard for fabricating complex aero-engine combustion chamber components and afterburners due to its exceptional stability at extreme temperatures. Our gas atomized powder features precise particle size distribution and high sphericity, ensuring superior layer uniformity during the laser melting process. Whether you require standard stock or specific customization, our heat-resistant alloy provides the robust mechanical properties necessary for next-generation aerospace propulsion systems.

11. Customization Services by Forgecise

Forgecise delivers comprehensive superalloy powder customization solutions, spanning the complete spectrum from standard high-temperature formulations to customer-specific high-performance nickel-based superalloys. We support mainstream superalloy grades including Haynes 230, Inconel series, and Hastelloy variants, with the capability to precisely tailor chemical composition, particle size distribution, sphericity, oxygen/nitrogen content, and thermal expansion coefficient to match your exact industrial and manufacturing requirements. Our superalloy powders are optimized for demanding additive manufacturing processes including SLM and EBM, ensuring consistent printability, high density, superior high-temperature mechanical properties, and reliable performance in your final aerospace, energy, and industrial components.

FAQ:

Q1: What types of High-Temperature Alloy powders can Forgecise customize?

A: We provide comprehensive high-temperature alloy powder customization solutions tailored for extreme environment applications in aerospace, energy, and industrial sectors:
Haynes 230 Series (Nickel-Chromium-Tungsten-Molybdenum): Our flagship high-temperature superalloy offering exceptional oxidation resistance and thermal stability. Features tensile strength ≥800 MPa at room temperature and ≥230 MPa at 900°C, with elongation ≥30%. Ideal for aero-engine combustion chambers, turbine components, and high-temperature furnace fixtures.
Inconel Series (Nickel-Chromium-Iron): Including Inconel 625, 718, and 738 formulations optimized for high-strength, corrosion-resistant applications. Inconel 718 delivers outstanding tensile strength (≥1200 MPa) and excellent fatigue resistance for turbine blades and rocket engine components.
Hastelloy Series (Nickel-Molybdenum-Chromium): Such as Hastelloy X and C-276, designed for extreme corrosion resistance in aggressive chemical environments while maintaining high-temperature strength. Perfect for chemical processing equipment and exhaust systems.

Q2: Can the particle size and morphology of customized High-Temperature Alloy powders be precisely controlled?

A: Absolutely. High-temperature alloys require stringent control to ensure defect-free printing, consistent high-temperature performance, and reliable long-term service in extreme environments. We ensure:
Particle Size Range: Fully customizable D50 from 15–65 μm.
15–45 μm: Optimized for high-precision SLM to achieve fine surface finishes and complex geometries critical for thin-walled combustion chambers and intricate cooling channels.
45–105 μm: Suitable for larger-format printers, EBM processes, or components requiring higher build rates without sacrificing density.
Morphology & Flowability: We guarantee high sphericity (>95%) and smooth surfaces with minimal satellite particles. This ensures excellent flowability (≤18 s/50g for Haynes 230) and high packing density, which are critical for uniform powder spreading, reducing porosity, and achieving >99.5% relative density in printed high-temperature components.
Special Handling: High-temperature alloy powders are sensitive to oxygen and nitrogen pickup, which can compromise high-temperature strength and oxidation resistance. We provide inert gas packaging and recommend storage under argon atmosphere to maintain interstitial element levels (O < 0.02%, N < 0.02%) throughout the printing lifecycle.

Q3: How long does the customization process take? How is quality guaranteed?

Development Timeline: Small-batch prototyping (1–10kg) typically takes 3–4 weeks. Mass production timelines depend on order volume and atomization scheduling.
Quality Assurance: Tool steel powders are sensitive to moisture and oxidation. Every batch comes with a comprehensive Certificate of Analysis (CoA), including:Chemical Composition: Precise ICP analysis of alloying elements (Ni, Co, Mo, Ti) and interstitials (O, N, C). Low carbon content is critical for weldability.
Particle Size Distribution: Laser diffraction analysis (D10, D50, D90) to ensure printability.
Powder Characterization: Hall Flowmeter testing and Apparent/Tapped Density measurements.
Morphology: SEM imaging to verify sphericity and check for internal porosity or satellites.
Standards Compliance: We strictly adhere to ASTM and ISO standards for metal powders to ensure consistency and repeatability in your additive manufacturing process.

Q4: What is the minimum order quantity (MOQ)? Do you support R&D-scale small batches?

A: We offer flexible solutions to support every stage of innovation:
R&D Validation: We support orders starting from 1kg, allowing researchers and mold designers to screen materials and optimize print parameters (laser power, scan speed) without high inventory costs.
Pilot Production: 10–100kg batches with rapid delivery to support pilot runs, mold trials, and small-series manufacturing.
Scaled Supply: We have ton-scale continuous production capacity to ensure a stable supply chain for industrial manufacturing and large-scale mold production.
We understand that material innovation starts small, so we provide barrier-free access for startups, universities, and research labs developing next-generation tooling.

Q5: How do I initiate a customization project? What information is required?

A: Three simple steps to get started:
Requirement Discussion: Provide your target application (e.g., injection molding inserts, aerospace brackets, cutting tools), key performance needs (hardness, toughness, thermal conductivity), and the specific 3D printing equipment you are using.
Solution Design: Our materials engineers will recommend the optimal alloy system, particle size distribution, and atomization process to balance performance, cost, and printability.
Sample Confirmation: We deliver prototype powder → You validate via printing and heat treatment → Mass production delivery upon approval.
Simply submit your preliminary requirements via email or our online form, and we will provide technical support within 48 hours.

Key Features

High Speed, High Precision, High Quality

Laboratory setting showing gloved hands holding innovative 3D printed metal structures.

Forgecise Metal 3D Printers – SLM Series

Excellent as-built surface finish – Parts achieve good surface quality without post-polishing.
High dimensional accuracy – Ideal for producing precision prototypes.
Direct fabrication of metal end-use parts – Eliminates intermediate steps.
Fully dense metallurgical structure (>99% density) – Eliminating the need for post-processing.
Rapid build times – Parts can be completed depending on size and complexity.
Complex geometries made possible – Functional features such as snap-fits and living hinges can be printed directly.
Broad material compatibility – Supports a wide range of metal powders.
Perfect for custom, low-volume production – small-batch manufacturing.

GH4099 Superalloy Powder for SLM | High-Temperature AM Material | Forgecise

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