Haynes 188 Powder

Overview of Haynes 188 Powder

Haynes 188 Powder is a cobalt-nickel-chromium-tungsten alloy known for exceptional oxidation resistance and strength at temperatures exceeding 2,000°F (1,093°C). It’s a preferred material in high-performance environments such as gas turbines and aerospace engines due to its resilience under stress and high thermal capacity. In simple terms, Haynes 188 Powder is like the “superhero” of metals for extreme temperature applications.

Key Features of Haynes 188 Powder:

  • High strength and hardness at elevated temperatures
  • Excellent resistance to oxidation and carburization
  • Good ductility and workability in its powdered form
  • Superior weldability and formability for complex manufacturing needs
FeatureDescription
CompositionCobalt-Nickel-Chromium-Tungsten alloy
Max Operating Temperature2000°F (1093°C)
ApplicationsAerospace, Industrial Gas Turbines, High-Temp Environments
AdvantagesHigh strength, oxidation resistance, thermal stability
Haynes 188 Powder

Composition of Haynes 188 Powder

The composition of Haynes 188 Powder is what gives it its unique properties. With a carefully balanced mix of cobalt, chromium, nickel, tungsten, and trace elements, Haynes 188 offers superior performance even in the most demanding applications.

ElementPercentage Composition
Cobalt~50-55%
Chromium~20-24%
Nickel~1-3%
Tungsten~13-16%
Iron3% max
Carbon0.05-0.15%

This composition allows Haynes 188 Powder to maintain stability at high temperatures, resist oxidation, and exhibit excellent thermal fatigue resistance, setting it apart from other high-performance alloys.

Characteristics of Haynes 188 Powder

Understanding the key characteristics of Haynes 188 Powder is crucial, especially if you’re comparing it to other high-temperature alloys. Each element contributes to its properties:

  1. Oxidation Resistance: The high chromium content forms a stable oxide layer, protecting the material from degradation.
  2. Thermal Stability: Tungsten adds to the alloy’s stability, allowing it to withstand fluctuating temperatures.
  3. High-Temperature Strength: Cobalt enhances the strength of Haynes 188 Powder under intense heat.

Applications of Haynes 188 Powder

Haynes 188 Powder is extensively used in industries where high temperature and oxidation resistance are essential. Here’s a breakdown of where this material shines:

ApplicationUse Case
Aerospace TurbinesCritical components in jet engines and gas turbines
Industrial Gas TurbinesPower generation turbines exposed to high temperatures
AutomotiveExhaust systems, catalytic converters, and performance engines
Marine ApplicationsComponents in engines where corrosion resistance is a priority
Power PlantsHigh-stress environments that require durability and stability at high temps

Specifications, Sizes, Grades, and Standards of Haynes 188 Powder

The specifications and grades of Haynes 188 Powder can vary, depending on the exact application requirements and the desired properties. Below is a summary of standard sizes and grades that you might encounter.

SpecificationDetails
Powder SizeAvailable in fine, medium, and coarse sizes
GradeHaynes 188, Haynes 25 (related alloy)
Industry StandardsASTM F75, AMS 5608, AMS 5772
HardnessRockwell C scale: 32-36
Tensile StrengthUp to 900 MPa (at room temperature)

Top Models of Metal Powders Similar to Haynes 188

Here are some additional powder models that offer similar high-performance properties for comparison.

Metal Powder ModelDescription
Inconel 718Nickel-chromium alloy known for high strength and oxidation resistance at elevated temps
Haynes 25Cobalt-based alloy with good oxidation resistance, but slightly less strength than Haynes 188
Hastelloy XHigh-temperature nickel alloy, widely used in aviation and industrial applications
Cobalt L-605Excellent for turbine blades, resists oxidation and carburization at high temps
Stellite 21Cobalt-based with superior wear resistance, especially useful in tooling applications
WaspaloyNickel-based superalloy, used in high-stress gas turbine applications
Haynes 282Improved weldability and thermal stability, used in aviation engines
Incoloy 800HKnown for good oxidation resistance and heat treatment capabilities
Titanium 6Al-4VCommonly used in high-strength, lightweight applications but with limited temperature range
Nimonic 90Nickel-chromium alloy with cobalt, ideal for high-stress turbine blades

Comparison of Haynes 188 Powder with Other Metal Powders

To choose the right powder, it’s important to consider each alloy’s pros and cons compared to Haynes 188 Powder.

PropertyHaynes 188Inconel 718Stellite 21
Oxidation ResistanceExcellent at high tempsHigh at moderate to high tempsVery good at high temps
StrengthVery high at elevated tempsExcellentGood for wear-resistant uses
WorkabilityGood for complex partsModerateModerate
CostHigher due to cobaltModerateLower than Haynes 188
WeldabilityGood for high-temp applicationsFairGood

Pros and Cons of Haynes 188 Powder

AdvantagesLimitations
Exceptional oxidation and corrosion resistanceHigher cost due to cobalt content
High strength in extreme temperaturesHeavier than some alternative alloys
Excellent workability for powder metallurgyRequires precise handling for durability
Widely accepted in high-performance industriesLimited suppliers, affecting availability
Haynes 188 Powder

FAQ

QuestionAnswer
What is Haynes 188 Powder used for?Used mainly in aerospace, industrial gas turbines, and automotive exhaust systems.
How does Haynes 188 Powder compare to Inconel?Haynes 188 offers higher oxidation resistance but may be pricier due to cobalt content.
Is Haynes 188 Powder expensive?Yes, it can be more expensive than other alloys, but its performance often justifies the cost.
Can Haynes 188 Powder be welded?Yes, it has excellent weldability for high-temperature applications.
What standards apply to Haynes 188 Powder?Common standards include ASTM F75, AMS 5608, and AMS 5772.

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