| Title |
Effect of Heat-Treatment on the Elevated Temperature Compression and Compressive Creep Properties of Fe-14Cr Ferritic Oxide Dispersion Strengthened (ODS) Steel |
| Authors |
김영균(Young-kyun Kim); 주연아(Yeun-ah Joo); 박종관(Jong-kwan Park); 김휘준(Hwi-jun Kim); 공만식(Man-sik Kong); 이기안(Kee-ahn Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2017.55.12.862 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
mechanical alloying; oxide dispersion strengthening; microstructure; high temperature compression; high temperature creep |
| 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) |