Abstract
The grain structures and microscopic features of a nickle-base Inconel 738LC were examined under various melting and casting conditions. Results show that the gain size of the γ matrix is reduced significantly by a treatment of lowing melt superheat temperature (LMST). By the addition of a trace intermetallic compound A1 x Ni y to the melt together with LMST treatment, a remarkable refinement could be obtained. The grain size over the whole section of castings could be refined to 0.5–0.8 mm, i.e. to ASTM grain size M11–12. In addition, the size of primary MC carbides in the alloy is reduced. The secondary dendrite arm spacing and phase constitution of the alloy are less sensitive to the additions.
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