Abstract:The influence of nitrogen addition on the microstructure and mechanical properties of vanadium microalloyed steel was studied. Experiment steels with different vanadium and nitrogen content were processed by thermal deforming simulation and rolled by laboratory roller respectively. OM, SEM and TEM were used to investigate the microstructure. Test results show that bainite laths and granular bainite are dominant in base vanadium microalloying steel. Intragranular ferrite trasnformation is promoted by nitrogen addition, which leads to acicular ferrite microstructure and refines the martensite-austeniete component. The toughness is improved as well. However, addition of vanadium increases precipitation strengthening, but has little effect on the morphology. The toughness is not improved. Vanadium precipitates in austenite as VN for nitrogen-rich steel. While for the nitrogen-low steels, it precipitates in ferrite as VC even if the content of vanadium is increased. The lattice misfit degree of austenite-ferrite, VC-ferrite and VN-ferrite are 6.72%, 3.89% and 1.55% respectively. It indicates that VN precipitated in austenite acts as preferential nucleation sites and promotes the intragranular ferrite transformation.
收稿日期: 2014-07-22
出版日期: 2015-04-13
引用本文:
马江南,杨才福,王瑞珍. 增氮对钒微合金钢组织和性能的影响[J]. 钢铁, 2015, 50(4): 63-69.
MA Jiang-nan,YANG Cai-fu,WANG Rui-zhen. Influence of nitrogen addition on the microstructure and properties of vanadium microalloyed steel. Iron and Steel, 2015, 50(4): 63-69.
A. Kern, T. Nisessen, U. Schriever, H-J. Tschersich. Production and properties of thermomechanically rolled high strength steel plates with minimum yield strengths up to 700 MPa [J]. Ironmaking and Steelmaking, 2005,32 (4): 331-336.
[1]
A. Kern, T. Nisessen, U. Schriever, H-J. Tschersich. Production and properties of thermomechanically rolled high strength steel plates with minimum yield strengths up to 700 MPa [J]. Ironmaking and Steelmaking, 2005,32 (4): 331-336.
N. Tsunekage, K. Kobayashi, H. Tsubakino. Influence of sulphur and vanadium additions on toughness of bainitic steels [J]. Materials Science and Technology, 2001, 17(7):847-855.
[5]
N. Tsunekage, K. Kobayashi, H. Tsubakino. Influence of sulphur and vanadium additions on toughness of bainitic steels [J]. Materials Science and Technology, 2001, 17(7):847-855.
[6]
R. Lagneborg, T. Siwecki, S. Zajac, B. Hutchinson, The Role of Vanadium in Microallyed Steels[M], Stockholm: The Scandanavian Journal of Metallurgy, 1999.
[6]
R. Lagneborg, T. Siwecki, S. Zajac, B. Hutchinson, The Role of Vanadium in Microallyed Steels[M], Stockholm: The Scandanavian Journal of Metallurgy, 1999.
[7]
T. Senuma. Present Status of and Future Prospects for Precipitation Research in the Steel Industry [J] . ISIJ International, 2002, 42(1): 1-12.
[7]
T. Senuma. Present Status of and Future Prospects for Precipitation Research in the Steel Industry [J] . ISIJ International, 2002, 42(1): 1-12.
[8]
F. Ishikawa, T. Takahashi. The formation of intragranular ferrite plates in medium-carbon steels for hot-forging and its effect on the toughness [J]. ISIJ International, 1995, 35(9): 1128-1133.
[8]
F. Ishikawa, T. Takahashi. The formation of intragranular ferrite plates in medium-carbon steels for hot-forging and its effect on the toughness [J]. ISIJ International, 1995, 35(9): 1128-1133.
[9]
T. Siwecki. Vanadium Microalloyed Bainitic Hot Strip Steels [J]. ISIJ International, 2010,50(5): 760-767.
[9]
T. Siwecki. Vanadium Microalloyed Bainitic Hot Strip Steels [J]. ISIJ International, 2010,50(5): 760-767.
[10]
K. Nakai, T. Sakamoto, R. Asakura, Y. Kotani, N. Isomura, S. Kobayashi, M. Hamada, Y. Komizo. Nucleation of bainite at small angle dislocation network in austenite and its effects on mechanical properties in Steels [J]. ISIJ International, 2011,51(2): 274-279.
[10]
K. Nakai, T. Sakamoto, R. Asakura, Y. Kotani, N. Isomura, S. Kobayashi, M. Hamada, Y. Komizo. Nucleation of bainite at small angle dislocation network in austenite and its effects on mechanical properties in Steels [J]. ISIJ International, 2011,51(2): 274-279.
[11]
D. Glisic, N. Radovic, A. Koprivica, A. Fadel, D. Drobnjak. Influence of reheating temperature and vanadium content on transformation behavior and mechanical properties of medium carbon forging steels [J]. ISIJ International, 2010, 50(4): 601-606.
[11]
D. Glisic, N. Radovic, A. Koprivica, A. Fadel, D. Drobnjak. Influence of reheating temperature and vanadium content on transformation behavior and mechanical properties of medium carbon forging steels [J]. ISIJ International, 2010, 50(4): 601-606.
[12]
C. Capdevila, C. Garcia-mateo, J. Chao, F. G. Caballero. Effect of V and N precipitation on acicular ferrite formation in sulfur-lean vanadium steels [J]. Metallurgical and Materials Transactions A, 2009,40A(3):522-538.
[12]
C. Capdevila, C. Garcia-mateo, J. Chao, F. G. Caballero. Effect of V and N precipitation on acicular ferrite formation in sulfur-lean vanadium steels [J]. Metallurgical and Materials Transactions A, 2009,40A(3):522-538.
[13]
K. He, D. V. Edmonds. Formation of acicular ferrite and influence of vanadium alloying [J] . Materials Science and Technology, 2002, 18(3): 289-296.
[13]
K. He, D. V. Edmonds. Formation of acicular ferrite and influence of vanadium alloying [J] . Materials Science and Technology, 2002, 18(3): 289-296.
[14]
B. Bramfitt. The effect of carbide and nitride additions on the heterogeneous nucleation behavior of liquid iron [J]. Metallurgical Transactions, 1970, 1(7): 1987-1995.
[14]
B. Bramfitt. The effect of carbide and nitride additions on the heterogeneous nucleation behavior of liquid iron [J]. Metallurgical Transactions, 1970, 1(7): 1987-1995.