Abstract
This chapter describes the metallurgy of ultrahigh strength (UHS) steels used in airframe structures, particularly for landing gear components, for which medium carbon, low alloy steels have been the dominant materials. High alloy steels exhibiting better toughness and corrosion resistance are used for structures operating under more demanding loading conditions and environments such as in aircraft carriers. Steels are unique from the perspective of being in use significantly longer than any other metallic structural material and yet, being the first family of airframe alloys to be successfully designed computationally and commercialized, still provide significant opportunities for property enhancement. In the framework of the composition–microstructure–processing–properties relationships, the discussion in this chapter is limited to how UHS steels used in airframe structures have evolved historically, the metallurgy and mechanisms underlying their behavior, and how this knowledge has been applied to new alloy design.
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