15Cr-1Mo 강의 미세조직과 기계적 특성에 미치는 Ti 및 Y2O3 첨가의 영향

• Published in: 대한금속·재료학회지, 53(8) Vol. 53; no. 8; pp. 529 - 534
• Main Authors: 최지은, Ji Eun Choi, 홍순익, Sun Ig Hong, 최병권, Byoung Kwon Choi, 노상훈, Sanghoon Noh, 김가언, Ga Eon Kim, 김태규, Tae Kyu Kim
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 31.08.2015; 대한금속·재료학회
• Subjects: 15Cr-1Mo steel; ODS; oxide dispersion strengthend; oxide particles; Y2Ti2O7; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2015.53.8.529

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)