钒微合金化600MPa级高强钢筋的组织与性能

发布时间：2019-04-22 16:42

【摘要】：结合Gleeble3500热力模拟与工业试验,通过显微组织观察、硬度测试、拉伸试验与TEM研究了形变与冷却工艺对钒微合金化600 MPa级钢筋组织、力学性能及析出相的影响。结果表明:试验钢的铁素体转变范围广,无变形且冷速大于5℃/s时,组织中开始形成贝氏体与马氏体。相变前粗大的原奥氏体晶粒将促进贝氏体与板条马氏体形成;原奥氏体晶粒细小与低温形变有利于铁素体与岛状马氏体的形成。冷速较小时,试验钢经形变后的硬度值大于无形变后的硬度值。冷速较大时,试验钢无形变的硬度值大于形变后的硬度值。为了获得细小铁素体与珠光体以及细小弥散的氮化钒,最佳生产工艺为:终轧温度大于1000℃,冷速为3℃/s;或终轧温度为900℃,冷速为5℃/s。
[Abstract]:The effects of deformation and cooling process on microstructure, mechanical properties and precipitated phase of vanadium microalloyed 600MPa steel bar were studied by means of microstructure observation, hardness test, tensile test and TEM combined with Gleeble3500 thermal simulation and industrial test. The results show that the bainite and martensite begin to form in the microstructure when the ferrite transformation range is wide and the cooling rate is higher than 5 鈩，

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