| Title |
Effects of Ti and Y2O3 Addition on the Microstructure and Mechanical Properties of 15Cr-1Mo Steel |
| Authors |
최지은(Ji Eun Choi); 홍순익(Sun Ig Hong); 최병권(Byoung Kwon Choi); 노상훈(Sanghoon Noh); 김가언(Ga Eon Kim); 김태규(Tae Kyu Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2015.53.8.529 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
15Cr-1Mo steel; oxide dispersion strengthend; ODS; oxide particles; Y2Ti2O7 |
| Abstract |
The effects of Ti and Y2O3 addition on the microstructure and mechanical properties of a 15Cr-1Mo steel were evaluated. The 15Cr-1Mo and 15Cr-1Mo-0.3Ti-0.35Y2O3 steels were prepared by a mechanical alloying, hot isostatic pressing and hot rolling processes. Microstructural observation of these steels indicated that the Ti and Y2O3 addition to 15Cr-1Mo steel acted to refine a grain size and to form nano-sized oxide particles such as an Y2Ti2O7. As a result, the yield and tensile strengths at room temperature and at 700 ℃ were considerably enhanced. Considerable improvement of creep properties at 700 ℃ was also observed. These improvements could be mainly attributed to the formation of nano-sized oxide particles as well as the refined grain size. It is thus concluded that the Ti and Y2O3 addition to the 15Cr-1Mo steel would be very effective in improving the mechanical properties especially at high temperatures. (Received December 05, 2014) |