Abstract：In order to get a lower yield ratio and higher toughness of the high performance bridge steel Q500qE, relationship between microstructure and mechanical properties of the test steel varied with cooling rate was investigated with the Gleeble-3800 simulator. The results indicated that the microstructure of the test steel is primarily acicular ferrite (AF) and granular bainite ferrite (GBF) in all cooling rate, dispersed with M-A constituent under 5-25 ℃/s. Grain size of ferrite and maximum chord of M-A constituents decreased with the increasing of cooling rate, while the strength and yield ratio increased. The proper range of cooling rate for 500 MPa graded high performance bridge steel has been confirmed as 15-20 ℃/s.
收稿日期: 2013-11-13
出版日期: 2014-08-05
引用本文:
吴年春， 崔 强， 范 益， 李恒坤， 李 翔. 控冷冷速对高性能桥梁钢组织和力学性能的影响[J]. 钢铁, 2014, 49(8): 94-99.
WU Nian-chun, CUI Qiang, FAN Yi, LI Heng-kun, LI Xiang. Effect of Controlled Cooling Rate on Microstructure and Mechanical Properties of a High Perfomance Steel for Bridge. Iron and Steel, 2014, 49(8): 94-99.
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