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Erschienen in: Journal of Materials Engineering and Performance 3/2019

26.02.2019

Effect of Grain Refining on Properties of a Cast Superaustenitic Stainless Steel

verfasst von: Dustin A. Arvola, Mark C. Emmendorfer, Ronald J. O’Malley, Simon N. Lekakh, Laura N. Bartlett

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 3/2019

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Abstract

The goal of this study was to evaluate the industrial performance of cast high-alloy superaustenitic 19Cr-17Ni-6Mo stainless steel by refining the as-cast structure. A grain-refined, as-cast structure was achieved by the in situ inoculation with titanium nitrides (TiN) co-precipitated on previously formed spinel (MgAl2O4) inclusions, thus promoting heterogeneous nucleation of austenite during solidification. A homogenization heat treatment of the casting did not provide significant changes of the as-cast grain macrostructure in either the base or grain-refined steels. However, it was found that a combination of inoculation with heat treatment is an effective way of reducing interdendritic segregation. The industrial performance which includes the mechanical properties, corrosion resistance, and machinability was evaluated in the heat-treated condition for both base and inoculated steels. Tensile testing revealed improvements in ultimate tensile strength, ductility, and yield strength of the inoculated steel. The room-temperature impact properties exhibited a slight decrease in average impact energy but showed reduced variability in the inoculated steel compared to the base steel. The machining results showed that the inoculated steel had a slight improvement in machinability. The inoculated steel exhibited a lower corrosion rate but showed an increase in mass loss due to pitting. The changes in steel performance were linked to microstructure and nonmetallic inclusion families obtained by automated ASPEX SEM/EDX analysis.

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Metadaten
Titel
Effect of Grain Refining on Properties of a Cast Superaustenitic Stainless Steel
verfasst von
Dustin A. Arvola
Mark C. Emmendorfer
Ronald J. O’Malley
Simon N. Lekakh
Laura N. Bartlett
Publikationsdatum
26.02.2019
Verlag
Springer US
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 3/2019
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-019-03895-6

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