GE Additive Metal Additive Manufacturing

GE Additive Arcam EBM Spectra H

$1,200,000 – $1,800,000 Updated 2026-03-17

Key Specifications

build volume

250 mm dia x 430 mm H (9.8 x 16.9 in) — cylindrical envelope

print technology

Electron Beam Melting (EBM) — high vacuum, high preheat

beam power

Up to 6 kW electron beam

accelerating voltage

60 kV

max build temperature

1,000°C (1,832°F) — elevated for high-gamma-prime superalloys

vacuum level

~10^-3 mbar (high vacuum during processing)

Overview

The GE Additive Arcam EBM Spectra H is a high-temperature electron beam melting (EBM) system engineered specifically for refractory and superalloy materials that are difficult or impossible to process in laser-based systems. The 'H' designation stands for High-Temperature — the Spectra H is designed to maintain build chamber temperatures up to 1,000°C during processing, compared to 750°C in the standard Spectra L. This elevated preheat capability is the machine's defining characteristic, enabling crack-free processing of high-gamma-prime nickel superalloys like Alloy 718 and Alloy 738LC that suffer from solidification cracking and cold cracking when processed in standard EBM or LPBF chambers.

Electron beam melting uses a high-power electron beam (up to 6 kW) accelerated at 60 kV to selectively melt metal powder in a high-vacuum chamber. The high vacuum environment (10^-3 mbar) is fundamentally different from the inert-gas atmosphere of LPBF — it eliminates oxide formation entirely and enables processing of reactive materials like titanium and niobium without contamination. The elevated build temperature in EBM also creates a stress-relief effect during printing, dramatically reducing residual stresses compared to LPBF and largely eliminating the need for stress-relief heat treatment after printing.

The Spectra H's build volume is 250 x 430 mm (diameter x height) — a cylindrical envelope that accommodates the round build tank geometry used in EBM systems. The 4th-generation electron beam column used in the Spectra H delivers enhanced scan speed and resolution compared to earlier Arcam systems, improving both build speed and feature resolution on complex superalloy components. The HV Control software integrates process monitoring, parameter management, and Arcam's proprietary SEBM (Selective Electron Beam Melting) scan strategies.

Primary applications for the Spectra H include aerospace turbine components — high-temperature nickel superalloy blades, vanes, and structural components that operate in extreme thermal environments. The combination of vacuum processing, high preheat, and low residual stress makes it a preferred platform for components that require hot isostatic pressing (HIP) in their post-processing sequence, as the low residual stress state going into HIP produces more predictable and consistent results.

Full Specifications

Parameter	Value
Build Volume	250 mm dia x 430 mm H (9.8 x 16.9 in) — cylindrical envelope
Print Technology	Electron Beam Melting (EBM) — high vacuum, high preheat
Beam Power	Up to 6 kW electron beam
Accelerating Voltage	60 kV
Max Build Temperature	1,000°C (1,832°F) — elevated for high-gamma-prime superalloys
Vacuum Level	~10^-3 mbar (high vacuum during processing)
Layer Thickness	50 - 200 um (0.002 - 0.008 in)
Supported Materials	Alloy 718, Alloy 738LC, Ti-6Al-4V, Ti-6242, Niobium alloys, Gamma-TiAl
Build Rate	Up to 80 cc/hr (material and geometry dependent)
Software	Arcam HV Control
Machine Weight	Approx. 5,700 kg (12,566 lb)
Power Requirements	3-phase, 400V, 63A
Tish53	GFW655SSVWW

Strengths & Limitations

Strengths

1,000°C build temperature enables crack-free processing of high-gamma-prime nickel superalloys that cannot be reliably produced in LPBF or standard EBM
High-vacuum processing completely eliminates oxide formation — essential for titanium, niobium, and reactive alloys requiring maximum purity
Low residual stress in as-built parts reduces post-processing requirements and produces more consistent HIP results for flight-critical components
6 kW electron beam provides high melt pool energy for superalloy processing with controlled microstructure management
Established aerospace pedigree — Arcam EBM technology has been producing aerospace titanium and superalloy components for 20+ years
No inert gas consumption — the vacuum process eliminates the ongoing argon cost associated with LPBF systems

Limitations

Cylindrical 250 mm diameter build volume is smaller and geometrically constrained compared to rectangular LPBF build boxes
EBM surface finish is rougher than LPBF — as-built Ra is typically 25-35 um, requiring more aggressive post-processing for smooth surfaces
Minimum feature size is larger than LPBF due to beam spot size — fine features below ~0.3 mm are difficult to resolve accurately
Long build cycles (many hours to days) with extensive preheat and cool-down phases limit throughput compared to laser systems
GE Additive's organizational changes and portfolio restructuring introduce some uncertainty about long-term EBM product roadmap

Best For

Aerospace gas turbine manufacturers producing high-temperature nickel superalloy components — blades, vanes, and combustion hardware requiring 1,000°C processing capability Defense contractors producing Gamma-TiAl and advanced superalloy components for next-generation jet engines where LPBF cannot reliably process the material Titanium structural component producers who require the highest possible material purity through vacuum processing rather than inert gas protection Research institutions and national laboratories studying refractory metal additive manufacturing and novel superalloy processing Aerospace primes building AM capability for components requiring HIP post-processing where low residual stress is critical

Frequently Asked Questions

01 What does a GE Additive Arcam EBM Spectra H cost?

The Spectra H typically prices between $1.2 million and $1.8 million, reflecting its specialized high-temperature capability and industrial EBM heritage. Facility requirements including high-voltage power infrastructure, shielding provisions, and specialized powder handling add to the total investment.

02 Why is the 1,000°C preheat temperature important for the Spectra H?

High-gamma-prime nickel superalloys like Alloy 738LC solidify with complex microstructure that is prone to cracking at lower temperatures. By maintaining the entire powder bed and surrounding structure at 1,000°C throughout the build, the Spectra H creates a quasi-isothermal environment that allows the material to solidify and cool slowly, preventing the thermal gradients that cause cracking. This is not achievable in LPBF systems or in lower-preheat EBM machines.

03 How does EBM compare to LPBF for titanium aerospace parts?

Both processes are used for aerospace titanium, but with different advantages. EBM's vacuum environment produces higher-purity titanium with no oxygen pickup. EBM's elevated preheat creates near-zero residual stress in as-built titanium, often eliminating stress relief heat treatment. LPBF produces finer features, better surface finish, and supports a broader range of titanium alloys with faster qualification cycles. The choice depends on part geometry, surface finish requirements, and downstream processing.

04 What post-processing does Spectra H-built superalloy parts require?

Typical post-processing for EBM superalloy parts includes powder removal (parts are embedded in loose sintered cake that must be broken up), bead blasting to remove sintered powder from surfaces, hot isostatic pressing (HIP) to close any residual porosity, and solution anneal/age heat treatment to achieve the target microstructure. CNC machining of critical surfaces follows. EBM's low residual stress is advantageous going into HIP, and the near-net-shape capability reduces machining stock requirements.

05 What is the Arcam powder recovery system?

Arcam machines use a Powder Recovery System (PRS) that separates and recycles unfused powder from the sintered build cake after printing. The PRS uses controlled vibration and sieving to recover powder for reuse, maintaining powder quality across multiple builds. This is important for superalloy powders, which are expensive and must be carefully managed to prevent degradation.