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Vol.55, No.12, 862 ~ 870, 2017
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| Title |
| Effect of Heat-Treatment on the Elevated Temperature Compression and Compressive Creep Properties of Fe-14Cr Ferritic Oxide Dispersion Strengthened (ODS) Steel |
| 김영균 Young-kyun Kim , 주연아 Yeun-ah Joo , 박종관 Jong-kwan Park , 김휘준 Hwi-jun Kim , 공만식 Man-sik Kong , 이기안 Kee-ahn Lee |
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| Abstract |
| This study investigated the microstructure and the ambient-elevated temperature compression and elevated temperature creep properties of Fe-14Cr ferritic ODS steel manufactured by mechanical alloying (high energy ball milling) and hot extrusion processes. Initial microstructural observation of the as-extruded material identified elongated grains in the direction of extrusion; however, some recrystallization and grain growth were observed in the heat-treated material. The average grain sizes of the as-extruded material and heat-treated material were 0.4 and 1.1 μm, respectively. In addition, the heat treatment resulted in the increase in number density and the decrease in size of the nanocluster. A room temperature compression tests confirmed the heat-treated materials (1457 MPa) had relatively higher yield than the as-extruded material (1377 MPa), and a general tendency was observed that the difference in yield strength decreased as temperature increased. Furthermore, elevated temperature compressive creep tests confirmed that the heat-treated material had relatively greater creep resistance compared to the as-extruded material at all stress levels.
(Received July 14, 2017; Accepted September 18, 2017) |
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| Key Words |
| mechanical alloying, oxide dispersion strengthening, microstructure, high temperature compression, high temperature creep |
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