Inconel X750 (UNS N07750/W. Nr. 2.4669) is a precipitation-hardenable nickel chromium alloy that is highly corrosion and oxidation resistant, as well as having exceptional strength at temperatures up to 1300°F (704°C). This inconel alloy has great properties even down to cryogenic temperatures, making it suitable for a variety of applications. Inconel X 750 is used extensively in gas turbines for components such as rotor blades, wheels, bolts and other structural members, as well as rocket engine thrust chambers.
Overview of Inconel X 750
The high strength of Inconel X 750 is due to its high nickel content; containing between 50-55% Ni and 15-17% Cr with additions of iron, cobalt, titanium and aluminum. As the alloy is precipitation hardened it can be heat treated to improve its strength at higher temperatures up to 1800°F (982°C). INCONEL X-750 also retains good tensile properties even after long usage at elevated temperatures and offers excellent fatigue resistance in addition to being extremely resistant to creep rupture in comparison with other alloys.
Table of Contents
- Inconel X750 Chemical Composition
- Physical and Mechanical Properties Inconel X750
- Heat Treatment Inconel X750
- Applications Inconel X750
- Welding and Fabrication Inconel X750
Inconel X750 Chemical Composition
Chemical composition of Inconel X750
The chemical composition Inconel X 750 consists primarily of Nickel alloy ranging from 50%-55%, Chromium ranging from 15%-17%, Iron ranging from 6%-10%, Cobalt ranging from 0%-2%, Titanium ranging from 0%-3%, Aluminum ranging from 0%-1%, Molybdenum ranging 0%-3%. These are the main elements which make up the alloy but other minor elements may also be included depending on the grade selected or specific application requirements.
Alloying Elements and their effects
INCONEL X-750 has many desirable features including good weldability which makes it easier for fabrication purposes without compromising its structural integrity or mechanical properties. Its excellent formability allows it to be readily cold-worked into complex parts and shapes without sacrificing strength or resistance capabilities.
This alloy also has remarkable stress-rupture capabilities which enable it to operate under extreme pressure without suffering from cracking or fracture failure.
Additionally, this material offers great weldability allowing for welding, brazing or soldering by use of conventional techniques with no risk of cracking or embrittlement from weld decay making it an ideal material for a variety of industries such as aerospace engineering, power plants and chemical processing plants among others where superior performance in harsh conditions is required.
Physical and Mechanical Properties Inconel X 750
Mechanical properties (tensile strength, yield strength, elongation)
Inconel X 750 is a nickel-chromium-molybdenum alloy with exceptional corrosion and oxidation resistance. It has good creep rupture strength, good formability, and excellent weldability under a wide range of temperatures. Its mechanical properties make it well-suited for applications that require strength and heat resistance.
The tensile strength of Nickel X 750 is strongly dependent on temperature and can be as high as 1750 MPa when tested at room temperature. At higher temperatures, the tensile strength decreases somewhat but remains very high between 1000°C to 1200°C.
Yield strength of Nickel X 750 is significantly higher than its tensile strength, ranging from 1000MPa to 1500MPa depending on temperature. This provides excellent creep rupture resistance even at elevated temperatures.
In terms of elongation, Inconel X 750 exhibits an impressive performance, especially at room temperature where it can achieve up to 35%. While this decreases slightly with an increase in temperature it still holds up to 18% elongation even at 1200°C making it suitable for many load-bearing applications without the risk of permanent deformation or cracking when exposed to high temperatures over extended periods.
High-temperature properties of Alloy X750
Inconel X 750 displays very low elastic relaxation which results in low levels of stress relaxation when subjected to prolonged loads which makes it an ideal choice for use in dynamic pressure vessels and components where vibration or cycling are expected.
Inconel X 750 an ideal choice for cryogenic applications due to its remarkable ability to maintain mechanical properties over a wide range of temperatures – from cryogenic levels up to 1800°F – without sacrificing significant amounts of physical or chemical property values.
Heat Treatment Inconel X750
Inconel X 750 (UNS N07750) is a nickel-chromium alloy that is popularly used in high-temperature and corrosive environments. As it exhibits excellent strength, toughness, and creep resistance at elevated temperatures, Inconel X 750 is often employed in aerospace components and industrial applications such as gas turbines and turbochargers.
Inconel X 750 must be given one of a variety of heat treatments recommended by the Society of Automotive Engineers (SAE). These various heat treatments are designed to develop specific properties and ensure that the product form is in the best condition for its intended use.
Solution Treatment and Ageing Processes
Solution treatment is an important process for Inconel X 750 to take advantage of its properties.
Ageing Processes for Inconel X 750 can be used to improve mechanical properties and increase the alloy’s strength and hardness. Ageing is typically done after solution treatment and consists of annealing at a specific temperature and holding it for a prescribed time.
Applications of Inconel X750
Industrial applications of Alloy X750
INCONEL alloy X-750 is used in wide variety of industrial in heat-treating fixtures, forming tools, extrusion dies, and even test machine grips. In addition to these industrial applications, INCONEL alloy X-750 is also a popular choice for spring materials, fasteners, and other components that are exposed to extreme temperatures between subzero and 1200°F.
Nickel alloy X-750 to maintain its strength at higher temperatures without undergoing oxidation makes it ideal for aircraft components which must be lightweight but still capable of withstanding extreme conditions.
It has been used in various types of aircraft engines including civil aerospace engines as well as military jet engines. Additionally, its superior corrosion resistance makes it an ideal choice for chemical processing machinery and other industries where chemicals are present. Nickel alloy wide variety of industrial like Spring
Aerospace and gas turbine engine components
Nickel X-750 (UNS N07750) is a nickel alloy-chromium precipitation-hardenable alloy used in aerospace and gas turbine engine components. It offers excellent resistance to oxidation and corrosion at high temperatures and has relatively good strength and toughness properties.
Alloy gives it much sought-after qualities like stress rupture, fatigue, and creep resistance. It is used in a variety of components such as fan blades, compressor discs, shafts, rings, casings and fasteners. Its ability to withstand high temperatures makes it especially useful for exhaust systems on aircraft engines.
Welding and Fabrication of Inconel X750
Welding Processes and Techniques
Nickel X-750, careful selection of the appropriate filler material is critical to ensure a sound weldment. The commonly used filler materials for this alloy are Inconel 625 (ERNiCrMo-3), or AWS ERNiCrMo-4 (Inconel 82).
Special welding techniques are used to weld INCONEL X 750, including gas tungsten arc welding (GTAW), and gas metal arc welding (GMAW). Proper joint preparation is essential for successful welds. Preheating is usually not required when welding this alloy, but post-weld heat treatment (PWHT) may be necessary depending on the Material and Environment of the Application.
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