Effects of Alloying Elements on the Properties of Ni-Mo-Cr Superalloys with Low Thermal Expansion

Abstract:

The effects of alloying elements including tungsten, molybdenum and cobalt on the thermal expansion and mechanical properties of Ni-Mo-Cr superalloys were investigated. It was founded that cobalt had no influence on the thermal expansion properties of the alloys. The addition of proper amount of tungsten reduced the coefficient of thermal expansion and increased the mechanical properties of alloy both at room temperature and at high temperature. Reducing the amount of molybdenum and increasing the amount of tungsten were helpful to reduce the coefficient of thermal expansion of the alloys at high temperature and improved the performance consistency of the coefficient of thermal expansion from low to high temperature.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 503-507
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.503
• Online since: March 2016
• Authors: Min Yu, Kai Hong Cai, Zhen Rui Li
• Keywords: Alloying Elements, High Temperature Low Thermal Alloy

References

[1] Smith D F, Smith J S. A history of controlled, low thermal expansion superalloys. Physical Metallurgy of Controlled expansion Invartype Alloy, Eds, Russel K C, Smith D F. Warrendale, PA, TMS, 1990: 253.

[2] Qi Huan, Review of Inconel718 alloy: Its history, properties, processing and developing substitutes, Material Engineering[J], 2012, (8) 92-100.

[3] Zhang Shaowei, Application and development of Low-thermal expansion superalloy, Aviation Engineering & Maintenance[J], 1994, (9) 5.

[4] Srivastava s k. Low-thermal expansion, high Strength Ni-Cr-Mo alloy, for Gas Turbines. In Superalloys 1992, eds: Antolovich S D, Stusrud R. W et al. Warrendale, PA, TMS, 1992: 227.

DOI: 10.7449/1992/superalloys_1992_227_236

[5] Lee Pike, Krishna Srivastava. High temperature low thermal expansion Ni-Cr-Mo alloy: United State, US 2012/0213660 AL[ P]. 2012-08-23.