Inconel pulver: En komplett guide

Översikt över Inconel-pulver

Inconel powder refers to powder metallurgy forms of nickel-chromium-based superlegeringar trademarked under the Inconel name. Inconel powders are used for additive manufacturing, metal injection molding, and other powder metallurgy applications.

Some key properties of Inconel powder include:

• Hög hållfasthet och hårdhet vid förhöjda temperaturer
• Utmärkt korrosions- och oxidationsbeständighet
• God svetsbarhet och maskinbearbetning
• Hög hållfasthet vid krypbrott
• Bibehåller styrka och seghet vid kryogena temperaturer

Inconel powders are available in different alloy grades such as Inconel 625, 718, and 939 with varying composition and characteristics. They can be used to fabricate components for applications in aerospace, chemical processing, oil & gas, automotive, and power generation industries.

The main product forms are gas atomized spherical powders and agglomerated & sintered powders. Specifications include particle size distribution, flow rate, apparent density, and composition.

Olika typer av Inconel-pulver

Inconel 625 pulver

Inconel 625 is a nickel-chromium-molybdenum alloy with excellent corrosion resistance and high strength properties.

Typical Composition (% weight)

Viktiga egenskaper:

• Retains tensile and creep strength at high temperatures up to 980°C
• Resistant to pitting and crevice corrosion in chloride and other aggressive environments
• Oxidation resistance up to 980°C

Applikationer:

• Aerospace components like engine cowlings, thrust reversers
• Marine components such as shafts, fasteners
• Utrustning för kemisk bearbetning
• Oil & gas extraction and refining

Inconel 718 Pulver

Inconel 718 is a precipitation hardening nickel-chromium alloy with outstanding tensile, fatigue and creep properties at temperatures up to 700°C.

Typical Composition (% weight):

Viktiga egenskaper:

• Retains strength at temperatures up to 700°C
• Utmärkt korrosionsbeständighet
• God svetsbarhet
• Hög utmattningshållfasthet och seghet

Applikationer:

• Aerospace components like turbine disks, spacers, shafts
• Rocket motor casings, frames, fasteners
• Kärnkraftsreaktorer
• Cryogenic storage tanks

Inconel 939 Powder

Inconel 939 is a precipitation hardenable, nickel-based superalloy designed for improved creep rupture strength at high temperatures.

Typical Composition (% weight):

Viktiga egenskaper:

• Excellent creep strength up to 1095°C
• Oxidation resistance in continuous service to 980°C
• Corrosion resistance in hot gases
• Retains tensile strength at elevated temperatures

Applikationer:

• Gas turbine components like combustor cans, transitions
• Steam turbine bolting, casing
• Heat treatment equipment
• Aircraft engine parts

Properties of Inconel Powder

Fysikaliska egenskaper

Mekaniska egenskaper

Kemiska egenskaper

• Excellent corrosion resistance in various acids, alkalis, seawater
• Good resistance to oxidation and carburization up to 1095°C
• Resists sulfuric, phosphoric, organic acids

Tillämpningar och användningsområden för Inconel-pulver

Specifikationer för Inconel Powder

Storleksfördelning

Skenbar densitet

• Typical range is 2.5-4.5 g/cc

Flödeshastighet

• Measurement of how freely powder flows
• Expressed in s/50g
• Values of 25-35 s/50g are free flowing

Sammansättning

• Conforms to AMS specification for grade of alloy
• Analysis includes Ni, Cr, Fe, Nb, Mo, Ti, Al

Kontaminering

• Oxygen content below 0.1%
• Low levels of sulfur, selenium, lead

Leverantörer och prissättning

• Prices vary based on alloy grade, quality, lot size
• Economies of scale for large production volumes
• Extra processing like hot isostatic pressing, degas adds cost

How to Choose Inconel Powder

Factors to Consider

Legeringsklass

• Match alloy to operating temperature and properties needed
• 625 for corrosion resistance, 718 for strength at 700°C, 939 for 1095°C creep strength

Pulverstorlek

• Finer powder for better resolution and surface finish
• Larger powder for higher deposition rates

Produktionsmetod

• Gas atomized, plasma rotated electrode process (PREP), or other

Kvalitetsstandarder

• Chemical analysis, particle shape, contamination levels
• ISO 9001- eller AS9100-certifierad

Lot Size and Lead Time

• Price breaks on large volumes
• Plan ahead for custom orders

Application Method

• Select powder compatible with specific AM or MIM process

Efterbehandling

• Additional heat treatment, HIP may alter properties

Rekommendationer

• For additive manufacturing, powder less than 45 microns
• For MIM, go with larger particle size distributions
• Get samples and test prints before purchasing large quantities
• Work closely with your powder supplier to match product to part requirements
• Carefully control handling and storage to avoid contamination or alteration of powder

För- och nackdelar med Inconel-pulver

Fördelar

• Hög hållfasthet vid förhöjda temperaturer
• Utmärkt korrosions- och oxidationsbeständighet
• God svetsbarhet och maskinbearbetning
• Retains toughness at cryogenic temperatures
• Can be used to fabricate complex geometries with AM
• Powder metallurgy processing creates consistent fine microstructures

Nackdelar

• More expensive than steels and aluminum alloys
• Challenging to work with and process
• Susceptible to cracking from thermal stresses
• Difficult to cast without special techniques
• Limited number of suppliers for high quality powder

Vanliga frågor

What is Inconel powder used for?

Inconel powder is used to fabricate components with exceptional high temperature mechanical properties and corrosion resistance utilizing additive manufacturing or metal injection molding. Common applications are in aerospace, chemical processing, power generation, oil and gas, and automotive industries.

What is the difference between Inconel 625, 718 and 939 powders?

The main differences relate to composition resulting in varying temperature capabilities:

• Inconel 625 has excellent corrosion resistance to 980°C
• Inconel 718 offers the highest strength up to 700°C
• Inconel 939 is designed for creep strength at extreme temperatures up to 1095°C

Vilken partikelstorlek är bäst för AM?

A particle size range of 15-45 microns is recommended for powder bed fusion additive manufacturing with Inconel powders. Finer particles below 15 microns can cause challenges with flow and spreading. Particles above 45 microns may reduce resolution and surface finish.

Does Inconel powder require special storage or handling?

Yes, Inconel powders readily oxidize and absorb moisture which can alter their properties and flow characteristics. They require storage in sealed containers with either an inert gas or a vacuum. Handling techniques should minimize contact with air.

What post processing is required after AM with Inconel?

Post processes like hot isostatic pressing (HIP), heat treatment, and machining are usually required after additive manufacturing with Inconel powders. These help improve the microstructure and material properties to meet application requirements.

Is Inconel powder reusable after AM?

Yes, Inconel powder can be recovered after additive manufacturing and reused. However, the reused powder needs to be blended with fresh virgin powder at a ratio of 30% reused or less to maintain consistent quality.