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High-Purity Chromium Metal Supply Issues for Gas-Turbine Superalloys (1995) / Chapter Skim
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EXECUTIVE SUMMARY
Pages 1-6

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From page 1...
... These flaws can cause failure during aggressive forming operations and limit strength, ductility, fatigue life, and creep-rupture resistance during engine operation. To control the purity of the superalloys, the primary metal manufacturer and alloy
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From page 2...
... The quality of high-grade aluminothermic chromium metal has improved over the past decade, however, and aerospace engine manufacturers have certified this material for some higher-grade superalloys. While aluminothermic material of equivalent quality to the electrolytic material may now be available, changes in such critical applications as rotor-grade materials must be mutually acceptable to producer and user and will have to be subject to extensive qualification studies involving production and testing of alloys, test specimens, final cast and forged products, and possibly engines containing them.
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From page 3...
... The dismantling of the Tosoh facility in Japan as part of an urban renewal program has left Elkem in the United States as the only significant electrolytic producer outside of Russia. Although closures have reduced the quantity of high-purity chromium metal available internationally, shortages have not occurred for two reasons.
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From page 4...
... The National Defense Stockpile lathe National Defense Stoclc~ile is maintained by the Defense Stockpile Center of the Defense Logistics Agency. The purpose of the stockpile has been to provide the United States with a supply of strategic and critical raw material in the event of a national emergency.
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From page 5...
... art Act 'ee ~~~ ~' "o ~/ If ~ ;~e ~e ~c ~Zfer ~ -~ ~m m~' ~ be aft ~ ~e go~' ~ ~e fat e~~=Z5. 9~e aft If ~ ~ ~o ~Z-~ ~e 7~ ~e ~ ~' ~ ;~ ~e ~r ~~ fact Ace/ N~ ~ Q~ -a ~ ~r A-~~mf~m and/ ~~ Z
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Key Terms

  • metric tons
  • aerospace industry
  • defense stockpile
  • aluminothermic chromium
  • electrolytic chromium

  • world production
  • domestic supplier
  • aerospace quality
  • domestic aerospace
  • special action

  • supplier base
  • metal approximates
  • metal included
  • development opportunities
  • national emergency

  • alternative methodologies
  • world capacity
  • suddenly increase
  • grain boundaries
  • declined due

  • suggestions regarding
  • extensive qualification
  • aerospace superalloys
  • mutually acceptable
  • test specimens

  • aluminothermic process
  • defense logistics
  • electrolytic method
  • reported consumption
  • possibly engines


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