보자력 측정에 의한 아공석강 및 공석강의 열처리에 따른 미세조직 평가

변재원; 김정석; 권숙인; Jai Won Byeon; C.S. Kim; S.I. Kwun

Korean Journal of Materials Research, Vol.14, No.8, 565-572, August, 2004

DOI10.3740/MRSK.2004.14.8.565 Export Citation

보자력 측정에 의한 아공석강 및 공석강의 열처리에 따른 미세조직 평가

Characterization of Microstructures of Variously Heat Treated Hypoeutectoid and Eutectoid Steel by Magnetic Coercivity Measurement

변재원, 김정석¹, 권숙인^{1, †}

고려대학교 공학기술연구소
¹고려대학교 재료공학부

Jai Won Byeon, C.S. Kim¹, and S.I. Kwun^{1, †}

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

E-mail:

he microstructures of variously heat treated hypoeutectoid( 0.45% carbon) and eutectoid( 0.85% carbon) steel were characterized by magnetic coercivity measurement. The effect of spheroidization of cementites on the coercivity was investigated for 0.45% carbon steel. In case of 0.85% carbon steel, microstructural parameters such as prior austenite grain size, phase and pearlite interlamellar spacing were measured along with coercivity to investigate the relationships between them. Prior austenite grain size had little effect on the measured coercivity. Coercivity was observed to be high in order of martensite, pearlite and ferrite phases. The linear decrease of coercivity with increasing pearlite interlamellar spacing was found. The effect of each microstructural factor on the coercivity and the potential of coercivity as a nondestructive evaluation parameter for assessing microstructures of steel products are discussed.

Keywords:magnetic coercivity;microstructure;carbon steel;nondestructive evaluation

[References]

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Bramfitt BL, Marder AR, Mater. Charact., 39, 199 (1997)
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[1] Byeon JW, Kwun SI, Mater. Trans., 44, 2184 (2003)

[2] Byeon JW, Kwun SI, Mater. Lett., 58, 94 (2004)

[3] Altpeter I, J. Nondestruct. Eval., 15(2), 45 (1996)

[4] Byeon JW, Kwun SI, Phys. Stat. Sol. B, 241(7), 1756 (2004)

[5] Kwun SI, Hong ST, Choo WY, J. Mater. Sci. Lett., 19(16), 1453 (2000)

[6] Vedula KM, Heckel RW, Metall. Trans., 1, 9 (1970)

[7] Krauss G, Steels: Heat Treatment and Processing Principles, p.67, Materials Park, Ohio, (1995) (1995)

[8] Underwood E, Quantitative Stereology, p.56, Addison-Wesley, New York, (1972) (1972)

[9] Hyzark JH, Bernstein IM, Metall. Trans., 7A, 1217 (1976)

[10] Marder AR, Bramfitt BL, Metall. Trans., 7A, 365 (1976)

[11] Cullity BD, Introduction to Magnetic Materials, 2nd ed., p.317, Addison-Wesley, New York, (1972) (1972)

[12] Lo CCH, Jakubovics JP, Scruby CB, J. Appl. Phys., 81(8), 4069 (1997)

[13] Hetherington MG, Jakubovics JP, Szpunar JA, Tanne BK, Phil. Mag., 56B, 561 (1987)

[14] Bramfitt BL, Marder AR, Mater. Charact., 39, 199 (1997)

[15] Yamaura S, Furuya Y, Watanabe T, Acta Mater., 49, 3019 (2001)

[16] Sakamoto H, Okada M, Homma M, IEEE Trans. Magn., 23, 2236 (1987)

[17] Kim DW, Kwon D, J. Magn. Magn. Mater., 257, 175 (2003)

[18] Jiles DC, J. Phys. D, 21, 1186 (1988)

[19] Nakai N, Furuya Y, Obata M, Mater. Trans., 30, 197 (1989)

[20] Kwun H, Burkhardt GL, J. Appl. Phys., 61, 1576 (1987)