고강도 열연강판의 기계적 성질과 석출거동에 미치는 권취온도와 합금원소의 영향

강성수; 이오연; 한상호; 진광근; 성백석; S.S. Kang; O.Y. Lee; S.H. Han; K.G. Jin; B.S. Seong

Korean Journal of Materials Research, Vol.13, No.10, 683-690, October, 2003

DOI10.3740/MRSK.2003.13.10.683 Export Citation

고강도 열연강판의 기계적 성질과 석출거동에 미치는 권취온도와 합금원소의 영향

Effect of Coiling Temperature and Alloying Elements on the Mechanical Properties and Precipitation Behavior in High Strength Hot Rolled Steel Sheets

강성수, 이오연 ^†, 한상호¹, 진광근¹, 성백석 ²

전북대학교 신소재공학부, 신소재개발연구센터
¹POSCO 기술연구소 자동차강재연구센터
²한국원자력연구소 하나로이용연구단

S.S. Kang, O.Y. Lee^†, S.H. Han¹, K.G. Jin¹, and B.S. Seong²

School of Advanced Materials Engineering & RCAMD, Chunbuk National University, Chonju, Chonbuk, Korea
¹Automotive Steels Research Center, POSCO Technical Research Laboratories, Gwangyang, Jeonnam, Korea
²Korea Atomic Energy Research Institute, P.O.Box 105, Yusong, Daejon, Korea

E-mail:

The high strength low alloy(HSLA) steels microalloyed with Nb, Ti and V have been widely used as the automobile parts to decrease weight of vehicles. The effects of process conditions are investigated in the aspects of the precipitation behavior and the mechanical properties of HSLA steel microalloyed with Nb and Ti using TEM, SANS and mechanical testing. When Ti was added to a 0.07C-1.7Mn steel which was coiled at , the specimen revealed the property of higher tensile strength of 853.1 MPa and the stretch-flangeability of 60%. The stretch-flangeability was increased up to 97.8% for coiling temperature above . The precipitation hardening cannot be achieved in the 0.045C-1.65Mn steel which was the lower density of fine precipitates. However, the 0.07C-1.7Mn steels containing Nb and/or Ti which was coiled at X have a high precipitates density of $210^{ 5}$/㎥. The high strength of these steels was attributed to the precipitation hardening caused by a large volume froction of (Ti, Nb)C precipitates with a size below 5 nm in ferrite matrix.

Keywords:HSLA steel;Tensile properties;Stretch-flangeability;Precipitation density;Small Angle Neutron Scattering (SANS)

[References]

Kunishige K, CAMP-ISIJ, The Iron & Steel Inst. of Japan, 12, 428 (1999) (1999)
NKK Patent, P2001-172745 (2001)
NKK Patent, PCT/JP2001/09469 (2001)
Seong BS, Han YS, Lee CH, Lee JS, Hong KP, Park KN, Kim HJ, Appl. Phys. A, 74, S201 (2002)
Michalak JT, Hu H, Met. Trans., 10A, 975 (1979)
Speer JG, Hansen SS, Met. Trans., 20A, 25 (1989)
Kozasu I, Ouchi C, Sambei T, Okita T, Micro-alloying 75', 72 (1977)
Roberts W, Lidefelt H, Sandberg A, The Metals Society, 38 (1980)
Charleux M, Poole WJ, Militzer M, Deschamps, Met. Mater. Trans., 32A, 1635 (2001)
Kawano O, Wakita J, CAMP-ISIJ, The Iron & steel Inst, of Japan, 9, 1337 (1996) (1996)
Morita M, CAMP-ISIJ, The Iron and steel Inst, of Japan, 5, 1863 (1992) (1992)
Cho YR, Chung JH, Koo HH, Kim IB, Korean Journal of Mater. Research, 9, 1252 (1999)
Militzer M, Hawbolt EB, Meadowcroft TR, Met. Mater. Trans., 31A, 1247 (2000)
Mayer L, Heisterkamp F, Mueschenborn W, Microalloying, 75, 153 (1997)
Crooks MJ, Garratt-Reed AJ, Vander Sande JB, Owen WS, Met. Trans., 12A, 1999 (1981)
Stroms EK, Krikorian NK, J. Phys. Chem, 64, 1471 (1960)
Lee WB, Kang KB, Park CG, J. of the Korean Inst. of Met. & Mater., 37, 688 (1996)
Lifshitz IM, Slyozov VV, J. Phys. Chem. Solids, 19, 35 (1961)
Keiderling U, Wiedenmann A, Srdic V, Winterer M, Hahn H, J. Appl. Cryst., 33, 483 (2000)

[Related Articles]

[1] Kunishige K, CAMP-ISIJ, The Iron & Steel Inst. of Japan, 12, 428 (1999) (1999)

[2] NKK Patent, P2001-172745 (2001)

[3] NKK Patent, PCT/JP2001/09469 (2001)

[4] Seong BS, Han YS, Lee CH, Lee JS, Hong KP, Park KN, Kim HJ, Appl. Phys. A, 74, S201 (2002)

[5] Michalak JT, Hu H, Met. Trans., 10A, 975 (1979)

[6] Speer JG, Hansen SS, Met. Trans., 20A, 25 (1989)

[7] Kozasu I, Ouchi C, Sambei T, Okita T, Micro-alloying 75', 72 (1977)

[8] Roberts W, Lidefelt H, Sandberg A, The Metals Society, 38 (1980)

[9] Charleux M, Poole WJ, Militzer M, Deschamps, Met. Mater. Trans., 32A, 1635 (2001)

[10] Kawano O, Wakita J, CAMP-ISIJ, The Iron & steel Inst, of Japan, 9, 1337 (1996) (1996)

[11] Morita M, CAMP-ISIJ, The Iron and steel Inst, of Japan, 5, 1863 (1992) (1992)

[12] Cho YR, Chung JH, Koo HH, Kim IB, Korean Journal of Mater. Research, 9, 1252 (1999)

[13] Militzer M, Hawbolt EB, Meadowcroft TR, Met. Mater. Trans., 31A, 1247 (2000)

[14] Mayer L, Heisterkamp F, Mueschenborn W, Microalloying, 75, 153 (1997)

[15] Crooks MJ, Garratt-Reed AJ, Vander Sande JB, Owen WS, Met. Trans., 12A, 1999 (1981)

[16] Stroms EK, Krikorian NK, J. Phys. Chem, 64, 1471 (1960)

[17] Lee WB, Kang KB, Park CG, J. of the Korean Inst. of Met. & Mater., 37, 688 (1996)

[18] Lifshitz IM, Slyozov VV, J. Phys. Chem. Solids, 19, 35 (1961)

[19] Keiderling U, Wiedenmann A, Srdic V, Winterer M, Hahn H, J. Appl. Cryst., 33, 483 (2000)