Inconel® X750 - Heat Resisting Alloy Alloy - Material Information

Inconel® X750 is a nickel–chromium–iron alloy strengthened by additions of titanium, aluminum, and niobium. Designed for high-temperature service, it exhibits outstanding oxidation and corrosion resistance combined with excellent mechanical strength and creep resistance. These properties make it a material of choice for aerospace engines, nuclear reactor components, and petrochemical equipment operating under severe thermal and mechanical stress conditions.

Material Overview

Inconel X-750 has a stable face-centered cubic (FCC) Ni matrix strengthened by coherent Ni3(Al,Ti) precipitates that form during aging. The alloy’s high-temperature stability results from the uniform dispersion of these ordered precipitates, which inhibit dislocation movement. Mishra and Moore (1987) demonstrated that the optimal heat treatment for pressurized water reactor (PWR) applications involves aging at 871 °C for 100 hours, which enhances impact toughness and intergranular corrosion resistance. Marzocca et al. (2020) characterized X750’s microstructure and found that thermal treatment produces a high density of precipitates that improve mechanical integrity while maintaining corrosion resistance. Additionally, Yun et al. (2017) reported that Inconel X750 retains excellent oxidation resistance up to 1100 °C, forming a protective chromium oxide film that minimizes mass gain even after prolonged exposure.

Applications and Advantages

Inconel® X750’s superior performance in oxidizing and high-stress environments makes it ideal for turbine blades, gas control valves, and jet engine components. In nuclear reactors, it is used for springs, bolts, and tie rods requiring high strength at elevated temperatures and resistance to intergranular stress corrosion cracking (IGSCC). Studies by Remartínez et al. (2013) confirmed that X750 shows much lower IGSCC susceptibility compared to earlier Ni-based alloys such as Inconel 600, particularly when subjected to optimized heat treatments. Furthermore, its excellent creep resistance and microstructural stability ensure reliable performance over thousands of hours of cyclic loading, as demonstrated in long-term evaluations of aged components. These properties, combined with good formability and weldability, continue to make Inconel X750 a cornerstone material in aerospace and power generation industries.

Goodfellow Availability

Goodfellow supplies Inconel® X750 in high-purity forms including wire, foil, and rod. Each batch is processed under strict quality control to ensure consistent mechanical and corrosion-resistant properties. Custom dimensions, thermal treatments, and forms can be provided to meet specialized requirements for research and high-performance applications.

Explore Inconel® X750 - Heat Resisting Alloy (Ni74/Cr15/Fe7/Ti/Al/Nb) and other advanced materials in Goodfellow’s online catalogue: Goodfellow product finder.

References

• Marzocca, A. L., Bozzano, P. B., & Nervi, J. (2020). Microstructural characterization of Inconel X750 alloy used in reactor components. Microscopy and Microanalysis, 26(2), 310–318. https://doi.org/10.1017/S1431927620000707
• Remartínez, B., Pastor, J. I., & Santamaría, J. (2013). Intergranular stress corrosion cracking susceptibility of Inconel X-750: State of the art. Research Report.
• Mishra, B., & Moore, J. J. (1987). Inconel X-750: Selection of heat treatment for PWR applications. Scripta Metallurgica, 21(9), 1233–1236. https://doi.org/10.1016/0036-9748(87)90345-0
• Yun, J.-Y., Park, D., & Wang, J.-P. (2017). A study on the oxidation behavior of nickel alloys at elevated temperatures. IOP Conference Series: Materials Science and Engineering, 191(1), 012039. https://doi.org/10.1088/1757-899X/191/1/012039
• Jakobi, D., Karduck, P., & Von Richthofen, A. F. (2009). Nickel chromium alloy. Patent.