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Vol.53, No.8, 529 ~ 535, 2015
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| Title |
| Effects of Ti and Y2O3 Addition on the Microstructure and Mechanical Properties of 15Cr-1Mo Steel |
| 최지은 Ji Eun Choi , 홍순익 Sun Ig Hong , 최병권 Byoung Kwon Choi , 노상훈 Sanghoon Noh , 김가언 Ga Eon Kim , 김태규 Tae Kyu Kim |
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| 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) |
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| Key Words |
| 15Cr-1Mo steel, oxide dispersion strengthend, ODS, oxide particles, Y2Ti2O7 |
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