METHOD OF PREPARING HIGH-QUALITY MONOCRYSTALLINE BLANKS Russian patent published in 1999 - IPC

FIELD: metallurgy. SUBSTANCE: invention basically relates to technology of preparing cast monocrystalline blanks from alloys containing Fe-Co-Al- Cu-Ti and consists in that monocrystalline inoculum is of alloy containing all components of desired polycrystalline blank composition except titanium, content of which in initial polycrystalline blank is augmented relative to required composition by a value determined from formula: ΔC_blank= h/H•C_alloy where C_alloy is required content of titanium in monocrystalline blank; H height of initial polycrystalline blank, cm; and h is height of solder zone on inoculum, cm. Content of one or several components in inoculum is augmented by the value of titanium content in alloy, while contents of these components in blank are correspondingly lowered. Augmentation of titanium content in initial polycrystalline blank is necessary to compensate it in inoculum containing no titanium. Because of lack of titanium in inoculum, contents of other alloy components should be augmented. EFFECT: optimized technology. 1 tbl