Aviation forgings generally use materials with high specific strength and specific stiffness. Materials for large aviation forgings mainly include titanium alloys, ultra-high-strength steels, and aluminum alloys.
Titanium alloys for large aerospace titanium forging
Due to its high specific strength, specific stiffness, corrosion resistance, and other excellent properties, titanium alloys have been widely used in the aviation industry, and have significant effects on reducing the weight of aircraft structures and improving the service life of parts. Especially for military aircraft, some important structural components such as wing spars, bulkheads, landing gear, etc. are widely processed from titanium alloy forgings, which have high weight, large size, and cross-sectional area.
At present, the main grades of Ultra-Thin Titanium Alloy Sheets for aviation are TC4, TC18, TC21, TA15, TB6 (US Ti-1023 alloy), and so on. Among them, TC18 is suitable for the manufacture of large forgings due to the highest hardenability and is currently the most widely used in China. According to the demand of civil aircraft such as Boeing and Airbus, Russia has developed Ti-55531 titanium alloy based on TC18 alloy by reducing the content of Fe, which is easy to segregate. Ti-55531 is higher strength, with superior hardenability and a wider processing window, and is currently used on parts such as A380 aircraft hanger joints and landing gear struts
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