자기적 방법에 의한 0.85% 탄소강의 열처리에 따른 미세조직 및 기계적 성질 평가

변재원; 권숙인; Jai Won Byeon; S.I. Kwun

Korean Journal of Materials Research, Vol.13, No.2, 81-87, February, 2003

DOI10.3740/MRSK.2003.13.2.081 Export Citation

자기적 방법에 의한 0.85% 탄소강의 열처리에 따른 미세조직 및 기계적 성질 평가

Evaluation of Microstructures and Mechanical Property of Variously Heat Treated 0.85% Carbon Steel by Magnetic Method

변재원^†, 권숙인¹

고려대학교 공학기술연구소
¹고려대학교 재료금속공학부

Jai Won Byeon^†, and S.I. Kwun¹

Research Institute of Engineering and Technology, Korea University, Korea
¹Division of Materials Science and Engineering, Korea University, Korea

E-mail:

Microstructures and mechanical properties of variously heat treated 0.85% carbon steel(eutectoid steel) were evaluated by magnetic property measurements. Microstructural analysis (pearlite interstellar spacing), measurement of mechanical properties(Rockwell hardness, yield stress, fracture stress) and magnetic properties(coercivity, remanence, hysteresis loss, saturation magnetization) were performed to clarify mutual relationships among these parameters. Water quenched specimens with martensite structure showed much higher coercivity and remanence than air cooled or furnace cooled specimens with pearlite structure. The linear dependence of coercivity and remanence on pearlite interlamellar spacing as well as on Rockwell hardness, yield stress and fracture stress was observed in the pearlitic steel. Hysteresis loss and saturation magnetization showed no distinct trend with pearlite interlamellar spacing.

Keywords:pearlite interlamellar spacing;microstructure;carbon steel;nondestructive evaluation;magnetic property

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