템퍼링에 따른 Cu 첨가 고강도강의 미세조직과 기계적 특성

이상인; 황병철; Sang-In Lee; Byoungchul Hwang

Korean Journal of Materials Research, Vol.24, No.10, 550-555, October, 2014

DOI10.3740/MRSK.2014.24.10.550 Export Citation

템퍼링에 따른 Cu 첨가 고강도강의 미세조직과 기계적 특성

Effects of Tempering Treatment on Microstructure and Mechanical Properties of Cu-Bearing High-Strength Steels

이상인, 황병철 ^†

서울과학기술대학교 신소재공학과

Sang-In Lee, and Byoungchul Hwang^†

Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 139-743, Korea

E-mail:

The present study deals with the effects of tempering treatment on the microstructure and mechanical properties of Cu-bearing high-strength steels. Three kinds of steel specimens with different levels of Cu content were fabricated by controlled rolling and accelerated cooling, ; some of these steel specimen were tempered at temperatures ranging from 350 oC to 650 oC for 30 min. Hardness, tensile, and Charpy impact tests were conducted in order to investigate the relationship of microstructure and mechanical properties. The hardness of the Cu-added specimens is much higher than that of Cu-free specimen, presumably due to the enhanced solid solution hardening and precipitation hardening, result from the formation of very-fine Cu precipitates. Tensile test results indicated that the yield strength increased and then slightly decreased, while the tensile strength gradually decreased with increasing tempering temperature. On the other hand, the energy absorbed at room and lower temperatures remarkably increased after tempering at 350 oC; and after this, the energy absorbed then did not change much. Suitable tempering treatment remarkably improved both the strength and the impact toughness. In the 1.5 Cu steel specimen tempered at 550 oC, the yield strength reached 1.2 GPa and the absorbed energy at .20 oC showed a level above 200 J, which was the best combination of high strength and good toughness.

Keywords:Cu-bearing;tempering;microstructure;mechanical properties;high-strength steel

[References]

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Maruyama N, Sugiyama M, Hara T, Tamehiro H, Mater. Trans. JIM, 40, 268 (1999)
Takaki S, Fujioka M, Aihara S, Nagtataki Y, Yamashita T, Sano N, Adachi Y, Nomura M, Yaguchi H, Mater. Trans. JIM, 45, 2239 (2004)
Syarif J, Nakashima K, Tsuchiyama T, Takaki SS, ISIJ Int., 47, 340 (2007)
Elwazri AM, Fatehi A, Calvo J, Bai D, Yue S, ISIJ Int., 48, 107 (2008)
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Koo J, Luton MJ, Bangaru NV, Petkovic RA, Fairchild DP, Petersen CW, Asahi H, Hara T, Terada Y, Sugiyama M, Tamehiro H, Komizo Y, Okaguchi S, Hamada M, Yamamoto Y, Takeuchi I, Int. J. Offshore Polar Eng., 14, 2 (2004)
Hwang B, Lee CG, Kim SG, Metall. Mater. Trans. A, 42, 717 (2011)
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Ghosh A, Mishra B, Das S, Chatterjee S, Mater. Sci. Eng. A., 374, 43 (2004)
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[1] Krishnadev MR, Dionne S, Bowker JT, McGrath JT, in International Conference on Physical Metallurgy of Thermomechanical Processing of Steels and Other Metals (Tokyo, Japan, June 1988), Proceedings Vol. 2, ISIJ, 1988, p. 511., 511 (1988)

[2] Maruyama N, Sugiyama M, Hara T, Tamehiro H, Mater. Trans. JIM, 40, 268 (1999)

[3] Takaki S, Fujioka M, Aihara S, Nagtataki Y, Yamashita T, Sano N, Adachi Y, Nomura M, Yaguchi H, Mater. Trans. JIM, 45, 2239 (2004)

[4] Syarif J, Nakashima K, Tsuchiyama T, Takaki SS, ISIJ Int., 47, 340 (2007)

[5] Elwazri AM, Fatehi A, Calvo J, Bai D, Yue S, ISIJ Int., 48, 107 (2008)

[6] A. M. Elwazri, A. Fatehi, J. Calvo, D. Bai and S. Yue, ISIJ Int., 48, 107 (2008)

[7] Fatehi A, Elwazri AM, Calvo J, Yue S, in Proceedings of Materials Science and Technology (MS&T’08, Pittsburgh, Pennsylvania, USA, Oct. 2008), p. 1562., 1562 (2008)

[8] Koo J, Luton MJ, Bangaru NV, Petkovic RA, Fairchild DP, Petersen CW, Asahi H, Hara T, Terada Y, Sugiyama M, Tamehiro H, Komizo Y, Okaguchi S, Hamada M, Yamamoto Y, Takeuchi I, Int. J. Offshore Polar Eng., 14, 2 (2004)

[9] Hwang B, Lee CG, Kim SG, Metall. Mater. Trans. A, 42, 717 (2011)

[10] Tamura I, Sekine H, Tanaka T, Ouchi C, Thermomechanical Processing of High-Strength Low- Alloy Steels, Butterworth & Co. Ltd., London (1988). (1988)

[11] Gladman T, The Physical Metallurgy of Microalloyed Steels, The Institute of Materials, London (1997). (1997)

[12] Lee TH, Kim YO, Kim SJ, Phil. Mag., 87, 209 (2007)

[13] Hornbogen E, Glenn RC, Trans. TMS-AIME, 218, 1064 (1960)

[14] Youle A, Ralph B, Met. Sci., 6, 149 (1972)

[15] Goodman SR, Brenner SS, Low Jr JR, Metall. Trans. A, 4, 2363 (1973)

[16] Buswell JT, Proc. 14th Int. Symp. on Effect of Radiation in Materials, Nashville, Tennessee, ASTM STP (1968). (1968)

[17] Ghosh A, Mishra B, Das S, Chatterjee S, Mater. Sci. Eng. A., 374, 43 (2004)

[18] Ghosh SK, Haldar A, Chattopadhyay PP, Mater. Sci. Eng., A, 519, 88 (2009)