Abstract
Next generation fuel-efficient jet engines are running hotter presenting a structural challenge for the exhaust systems and structures adjacent to the engines. A conventional and affordable titanium alloy with superior oxidation resistance provides significant weight reductions and associated cost savings by eliminating the need for high density material systems such as nickel-base superalloys for service temperatures in between current titanium and nickel, enabling major technology advancement in high temperature aerospace applications. This paper presents an overview of Arconic’s engineered material ARCONIC-THORTM to address the needs of future aerospace systems.
Highlights
Major advances in materials and processes for gas turbine engines have led to higher operating temperatures that, in turn, have produced higher efficiency and reduced fuel burn [1]
Higher-temperature operation is inevitable for components such as pylons, nacelles, heat shields, plugs, and nozzles. Materials for these structures must bridge the performance gap between the stateof-the-art high-temperature titanium alloys and high-density material systems, otherwise weight and cost penalties defeat the benefits offered by efficient engines
As evidenced in the evolution of titanium alloys development for high temperature applications in the last 70 years shown in Figure 1, improvements in temperature capability have been incremental
Summary
Major advances in materials and processes for gas turbine engines have led to higher operating temperatures that, in turn, have produced higher efficiency and reduced fuel burn [1]. Higher-temperature operation is inevitable for components such as pylons, nacelles, heat shields, plugs, and nozzles Materials for these structures must bridge the performance gap between the stateof-the-art high-temperature titanium alloys and high-density material systems (nickel superalloys, corrosion resistance steels, ceramic matrix composites CMCs), otherwise weight and cost penalties defeat the benefits offered by efficient engines. The basic titanium alloy development approach has been: start with a known base alloy system; adjust/add alloying elements; utilize empirical experimentation approach / intuition to downselect a set of compositions; melt-process-heat treat-test; return to the base alloy and readjust chemistry and processing, if necessary; iterate alloy development to reach the target properties; scale-up and qualify a new alloy and process This iterative approach generally resulted in new alloys with properties approaching those desired for new applications at a high cost and long development times (10-20 years), with some failures interspersed in success stories. Current temperature needs are pushing beyond the available Ti alloys, forcing the only option of using high-density and expensive solutions for these applications, which increases the weight by approximately 25% and in most cases is an underutilization of their capability
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