| 摘要 |
<p>An article (especially a glass processing tool) production process involves subjecting a blank of ultra-fine grained oxide dispersion strengthened alloy (especially nickel base alloy) to partial hot forming by pressing, secondary recrystallisation heat treatment to achieve abnormal grain growth and further hot forming by pressing to produce the article. Preferably, prior to the process, (a) a series of identical alloy specimens is pressed at different temperatures and secondary recrystallised to determine an optimal abnormal grain growth temperature range for blank pressing; and (b) a further series of specimens is pressed in this optimal temperature range but with variable deformation profiles and secondary recrystallised to determine a critical local deformation rate region which inhibits abnormal grain growth, the blank deformation rate during the partial hot forming step being chosen outside this critical region. Also claimed is a method of manufacture, using the above process, of a mineral (especially glass) fibre producing centrifuge dish having a chamber and a peripheral flange, in which the chamber and optionally an intermediate inclined flange are produced by the partial hot forming step and, after recrystallisation heat treatment, the peripheral flange of desired inclination is produced by the further hot forming step.</p> |
