Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 47A, Issue 7, Pages 3289-3294Publisher
SPRINGER
DOI: 10.1007/s11661-016-3544-1
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Funding
- Ford Motor Company (University Research Program)
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A series of Nb-bearing austenitic heat-resistant cast steels with variations of N/C ratios were investigated, and the morphological change of Nb(C,N) from faceted blocks, mixed flake-blocks to Chinese-script was observed as N/C ratios decreased. The creep behavior of these alloys was studied at 1273 K (1000 A degrees C), and the longest creep life and lowest creep rate occurred in model alloys with script Nb(C,N). Residual delta-ferrites and (Cr,Fe)(23)C-6 were adverse to creep properties. This work indicates that the control of N/C ratio is required for the as-cast microstructural strengthening.
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