Inconel X750 Powder

Overview

Inconel X750 Powder is a nickel-chromium alloy powder used primarily in high-temperature applications requiring corrosion and oxidation resistance. It has excellent strength, toughness, and fatigue resistance up to 1300°F (704°C). Key features include:

• High temperature strength and corrosion resistance
• Excellent oxidation resistance up to 1800°F (982°C)
• Good weldability and formability
• Used in gas turbines, spacecraft, nuclear reactors, heat treating equipment

Inconel X750 powder can be used in various powder metallurgy techniques like hot isostatic pressing, metal injection molding, additive manufacturing, and laser/electron beam melting to fabricate complex parts.

Table 1: Inconel X750 powder types and characteristics

Composition

The nominal composition of Inconel X750 powder is given below:

Table 2: Chemical composition of Inconel X750 powder

The balance is nickel and incidental impurities. The mixture of niobium, tantalum, titanium, and aluminum content gives Inconel X750 excellent high temperature mechanical properties by precipitation strengthening.

Properties

Table 3: Physical and mechanical properties of Inconel X750

Applications

Some major applications of Inconel X750 powder include:

Table 4: Applications of Inconel X750 powder

Advantages of using Inconel X750 powder for these applications:

• Excellent high temperature mechanical properties up to 1300°F
• Retains strength and hardness at elevated operating temperatures
• Outstanding corrosion and oxidation resistance at high temperatures
• Parts maintain close dimensional tolerances during service
• Components have good surface finish and complex geometries

Table 5: Additive manufacturing processes for Inconel X750

Specifications

Inconel X750 powder is available in various size distributions and morphologies to suit different additive manufacturing processes:

Table 6: Specifications of Inconel X750 powder

Suppliers

Table 7: Suppliers of Inconel X750 powder

Typical pricing for Inconel X750 powder depending on size, shape, and quantity:

• Gas atomized spherical – $80-150 per kg
• Water atomized irregular – $30-60 per kg
• Research/prototype quantities – Smaller, could be double commercial

Table 8: Comparison of Inconel X750 versus Inconel 718

Limitations

Some drawbacks and challenges with using Inconel X750 powder include:

• Expensive alloy increases component costs significantly
• Difficult to fully dense without hot isostatic pressing
• Prone to cracking if not processed correctly
• Requires stress-relieving to avoid cracking during service
• Lower creep rupture strength than Inconel 718
• Subject to strain-age embrittlement at lower temperatures

Proper dispersion of strengthening particles requires solution heat treatment and aging to achieve optimal properties. Susceptible to oxidation above 1800°F requiring protective coatings.

FAQs

What is Inconel X750 used for?

Inconel X750 is used to fabricate components for high temperature applications requiring good mechanical strength, creep resistance, thermal fatigue strength, and corrosion resistance up to 1300°F. Typical uses include gas turbine blades, combustor components, spacecraft and nuclear reactor parts.

What additive manufacturing methods can use Inconel X750?

Inconel X750 powder can be processed using laser powder bed fusion (L-PBF), electron beam melting (EBM), and directed energy deposition (DED) methods. Each process produces parts with different microstructures and mechanical properties.

Does Inconel X750 require hot isostatic pressing?

For highest quality fully dense parts with optimum properties, Inconel X750 components fabricated by AM require HIP post-processing. However, parameters can be optimized to achieve >99% density directly after heat treatment for some applications.

Is Inconel X750 weldable?

Inconel X750 has lower weldability than the Inconel 600 series due to its precipitation hardening characteristics. Welding filler metals matching base composition along with proper solution annealing and aging is required to avoid weld cracking and weakened zones.

What is the typical surface finish of Inconel X750 AM parts?

For powder bed fusion processes like L-PBF and EBM, Inconel X750 parts typically have 8-12 μm surface roughness as-built. Additional finishing like grinding, milling, EDM can further improve finish. DED parts usually need extensive machining to final tolerances.

know more 3D printing processes