Process for the manufacture of semi-finished products or preformed parts made of refractory metals and resistant to thermal creep
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United States of America Patent
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Sep 24, 1991
Grant Date -
N/A
app pub date -
May 1, 1990
filing date -
May 3, 1989
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Expired
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Abstract
A process for the manufacture of dispersion-strengthened alloys of the refractory metals of the 4th, 5th and 6th subgroups of the Periodic Table for application in semi-finished products or preformed parts requiring high thermal creep-resistances, involves integrating dispersion-strengthening into the process in 2-4 partial operational steps through thermal reshaping, utilizing only 3-25% strain per partial step. Annealing processes are implemented between the individual reshaping processes at temperatures, which at least during some part of the annealing process, are below the respective recrystallization temperatures of the alloy materials. The maximum deformation of the alloy materials is 75%, but is normally substantially lower. Components manufactured from the materials produced according to the process include tools used in isothermic high-temperature forging or in rotating anode X-ray tubes.
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