Fe-0.7%C-2.3%Si강의 미세조직과 기계적 성질에 미치는 잔류 오스테나이트 변태 거동

손제영; 권도영; 김지훈; 김원배; 김학진; 예병준

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자료유형: 학술저널

저자정보: 손제영 (경북대학교) 권도영 (경북대학교) 김지훈 (중소기업진흥공단) 김원배 (기술보증기금) 김학진 (현대제철) 예병준 (경북대학교)

저널정보: 한국주조공학회 한국주조공학회지 (주조) 한국주조공학회지 제32권 제3호

발행연도: 2012.1

수록면: 138 - 143 (6page)

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This steel has been synthesized integrating concepts from Austempering Ductile Cast Iron (ADI) technology. While ADI has excellent mechanical and physical properties, the Young's modules of ADI is approximately 20% lower than steel. In addition, the presence of graphite nodules in ADI can be sites of crack initiation, where fracture takes place at graphite matrix interface. Because of this limitations of ADI, there has been a growing interest in austempered steels as structural materials in resent years. In this investigation, a new steel with microstructure composed of ferrite and austenite and with simultaneous high tensile strength (1,150 MPa) and high ductility (33%) was developed. The goal of this investigation is to obtain a better understanding of deformation and transformation behaviour in high carbon retained austenite(${\gamma}_{HC}$) and over-saturated ferrite(${\alpha}$) during the plastic deformation. A detailed study of the microstructure of this steel was carried out by means of X-ray diffraction (XRD) and electron back scattering diffraction (EBSD) technic. In this way it was shown that BCC phase (BCC) took up the larger part of the nominal strain whereas the a part of retained austenite responded to the mechanincal load by partial martensite transformation, and misorientation change in the retained austenite after plastic strain could be attributed to the large elongation.

#Austempering #Retained austenite #Carbon concentration #Misorientation

참고문헌 (10)

참고문헌 신청

V. F. Zackay / 1976 / Isothermal studies of bainitic and martensitic transformations in some low alloy steels / Metallugical transactions A 7(11):1800~1803

손제영 / 2010 / 주조 및 열간 압연된 Fe-0.7wt%C-2.3wt%Si-0.3wt%Mn 강의 프로세싱 윈도우와 기계적 성질에 미치는 오스템퍼링 조건의 영향 비교 / 한국주조공학회지 30(2):60~65

J. M. Velez / 1996 / Effect of silicon on kinetics of bainitic reaction in austempered ductile cast iron / Materials Science and Technology 12(4):329~337

K. Sugimoto / 1992 / Ductility and strain-induced transformation in a high-strength transformation-induced plasticity-aided dualphase steel / Met. Trans. A 23(11):3085~3091

P. Shewmon / 1978 / Phase transformations, stability and materials interactions / Materilas science and engineering 35(1):75~90