Some of the power train transmission gears in helicopter drive systems can become critical components as performance requirements are increased; accordingly, increasing attention must be paid to news alloys in order to obtain required performance, reliability and survivability. The major limitation of the alloy presently used, SAE 9310 steels, is its tendency to score and scuff under high-temperature conditions. Candidate advanced alloys, with improved high-temperature properties, while increasing the resistance to scoring and scuffing, tend to have lower ductility and fracture toughness. In this report, and attempt is made to identify desin, materials, and process problems and requirements. In addition, it is recommended that the characterization of candidate steels be accelerated; preliminary investigation indicates that new alloys may provide improved capability against surface distress. Other short- and long-term recommendations also are presented. (Jensen)
Materials for helicopter gears
Werkstoffe fuer Hubschraubergetriebe
US Government Reports ; Oct ; 1-100
1979
100 Seiten
Report
Englisch
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