0.002% 보론첨가 저탄소강의 미세조직 및 기계적 성질에 미치는 열처리의 영향

임종호; 김종식; 박병호; 이진현; 최정묵; Jong-Ho Lim; Jong-Sik Kim; Byung-Ho Park; Jin-Hyeon Lee; Jeong-Mook Choi

Korean Journal of Materials Research, Vol.21, No.6, 303-308, June, 2011

DOI10.3740/MRSK.2011.21.6.303 Export Citation

0.002% 보론첨가 저탄소강의 미세조직 및 기계적 성질에 미치는 열처리의 영향

Effects of Heat Treatment on the Micro-structures and the Mechanical Properties of 0.002% Boron-added Low Carbon Steel

임종호, 김종식, 박병호, 이진현^†, 최정묵¹

(재)포항금속소재산업진흥원
¹(주)진합

Jong-Ho Lim, Jong-Sik Kim, Byung-Ho Park, Jin-Hyeon Lee^†, and Jeong-Mook Choi¹

Pohang Institute of metal Industry Advancement, Pohang 790-784, Korea
¹Jinhap Co., Ltd., Taejon 306-220, Korea

E-mail:

The effect of heat treatment on the micro-structures and the mechanical properties of 0.002% boron added low carbon steel was investigated. The tensile strength reached the peak at about 880-890oC with the rising quenching temperature and then the hardness decreased sharply, but the tensile strength hardly decreased. The tensile and yield strength decreased and the total elongation increased with a rising tempering temperature, but the tensile and yield strength sharply fell and the total elongation prominently increased from above a 400-450oC tempering temperature. Tempered martensite embrittlement (TME) was observed at tempering condition of 350-400oC. In the condition of quenching at 890oC and tempering at 350oC, the boron precipitates were observed as Fe-C-B and BN together. The hardness decreased in proportion to the tempering temperature untill 350oC and dropped sharply above 400oC regardless of the quenching temperature.

Keywords:boron-added steel;heat treatment;mechanical properties;precipitation behavior

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[6] Sharma RC, Purdy GR, Metall. Mater. Trans., 5, 939 (1974)

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[10] Swarr T, Krauss G, Metall. Meter. Trans., 7A, 41 (1976)

[11] Lee JM, Kim YH, Hahn BH, J. Kor. Inst. Met. & Mater., 26, 1190 (1988)

[12] Takahashi N, Fujita T, Testu-to-Hagane, 61, 2604 (1975)

[13] Yamamoto K, Suzuki HG, Oono Y, Noda N, Inoue T, Tetsu-to-Hagane, 73, 115 (1987)

[14] Maitrepierre P, Thivellier D, Tricot R, Metall. Mater. Trans., 6A, 287 (1975)

[15] Karlsson L, Norden H, Acta Metall., 36, 35 (1988)

[16] Ahn BK, Lee KS, J. Kor. Inst. Met. & Mater., 34, 166 (1996)

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[18] Jadenska WJ, Morral JE, Metall. Mater. Trans., 3A, 2933 (1972)