Overview
Thanks to the advancement of new technology, an increasing amount of newly developed nickel alloys materials now become accessible, bringing benefits to aviation industry.
Nickel-based Super Alloy for Aviation Engine Disc
Nickel-based super alloy is developed to increase the operation temperature through the addition of some elements. The Udimet 720 alloy (Ni-16Cr-2.5Al-5Ti-3Mo-14.7Co-1.25W), originally used for the blade, involves powder metallurgy to make large disc forgings. Thanks to the smelting & refining technique, as well as the improved forging process, φ250mm diameter forging billets have been successfully developed and used on engines for civil and military aircrafts.
Low Expansion Super Alloy-- from Inconel 718, Incoloy 903, 907, 909 to Inconel 783
Chromium-containing super alloys used on gas turbine engines, such as Inconel 718 alloys, feature high expansion properties causing difficulties in fit tolerances. Hence, to solve the problem, it entails thoughtful design beforehand, use of expensive mechanical cooling systems, and leaving effective gap between the rotating parts and the seals. To tackle this problem at its source, new super alloy with low expansion properties, known as Incoloy 903 has been developed. Incoloy 903 featuring low chromium content, is developed to improve engine efficiency and used to make compressor boring and cover. Then come Incoloy 907 with added niobium and reduced aluminum and Incoloy 909 alloy with added silicon. Incoloy 909 features improved durability and plasticity but poor performance of high temperature oxidation resistance which requires high temperature coating for use. Also, intergranular crack expansion can happen when it is subjected to concentrated stress. To solve this issue, a high cobalt-containing Inconel 783 alloy (28.5Al, 3Cr, 34Co, 0.3Nb, 5.4Al, 0.1Ti) is developed. This alloy, with resistance to oxidation and intergranular crack expansion, can be used at temperatures below 700 °C without coating. Inconel 783 alloy features better stress durability than Incoloy 909 alloy and low expansion properties, hence, it is the main research topic of future aviation materials.
718
Si
C
Al
Ti
Co
Nb
Ta
Mo
Fe
Cr
Ni
903
Al
Ti
Co
Nb
Fe
Ni
907
Si
Al
Ti
Co
Nb
Fe
Ni
909
Si
Mn
Al
Ti
Cu
Co
Nb
Fe
Cr
Ni
783
Si
Al
Ti
Cu
Co
Nb
Fe
Cr
Ni
Inconel 718SPF
Inconel 718SPF is a type of superplastically formed nickel-based alloy with the same compositions as the standard (AMS5596) Inconel718 alloy, i.e., 50% Ni, 17% Cr, 0.6% Al, 1% Ti, 30% Mo, 5% Nb and remaining Fe. However, this alloy also has its own standard AMS 5950. The main difference lies in that 718 SPF requires optimum thermal deformation to obtain fine grain size. Compared with ordinary Inconel 718 alloy, the fine-grain superplasticized Inconel 718SPF alloy enhances the alloy fatigue life by100 times. Moreover, it is easier to make components with complicated shapes, high strength at high temperatures, and low manufacturing costs by making full use of superplastic molding technology. The superplastic molding technology, is initially and mainly adopted for aluminum and titanium alloys. Thanks to the development of Inconel 718SPFsuperplastic forming alloys, this technology makes breakthroughs in the field of superplastic forming of materials.
718SPF
Si
Al
Ti
Co
Nb
Mo
Fe
Cr
Ni
Contact Us
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