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http://dx.doi.org/10.3740/MRSK.2017.27.9.507

Effect of Powder Synthesis Method on the Microstructure of Oxide Dispersion Strengthened Fe-Cr-Al Based Alloys  

Park, Sung Hyun (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Publication Information
Korean Journal of Materials Research / v.27, no.9, 2017 , pp. 507-511 More about this Journal
Abstract
An optimum route to fabricate oxide dispersion strengthened ferritic superalloy with desired microstructure was investigated. Two methods of high energy ball milling or polymeric additive solution route for developing a uniform dispersion of $Y_2O_3$ particles in Fe-Cr-Al-Ti alloy powders were compared on the basis of the resulting microstructures. Microstructural observation revealed that the crystalline size of Fe decreased with increases in milling time, to values of about 15-20 nm, and that an FeCr alloy phase was formed. SEM and TEM analyses of the alloy powders fabricated by solution route using yttrium nitrate and polyvinyl alcohol showed that the nano-sized Y-oxide particles were well distributed in the Fe based alloy powders. The prepared powders were sintered at 1000 and $1100^{\circ}C$ for 30 min in vacuum. The sintered specimen with heat treatment before spark plasma sintering at $1100^{\circ}C$ showed a more homogeneous microstructure. In the case of sintering at $1100^{\circ}C$, the alloys exhibited densified microstructure and the formation of large reaction phases due to oxidation of Al.
Keywords
Fe-base superalloy; oxide particle dispersion; polymeric additive solution; spark plasma sintering;
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Times Cited By KSCI : 2  (Citation Analysis)
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