| Q345B钢动态再结晶动力学模型研究 |
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| 作者姓名： | 杨 静 徐 光 韩 斌 补丛华 邹 航 |
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| 作者单位： | 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室;武汉钢铁(集团)公司研究院 |
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| 摘 要： | 在Gleeble 1500热模拟机上进行Q345B钢单道次压缩变形实验,得到其真应力-真应变曲线,结合加工硬化率曲线,确定了Q345B钢动态再结晶临界应变εC、峰值应变εP和稳态应变εS。根据实验结果得到Zener-Hollomon方程和动态再结晶状态图,利用Johnson-Mehl-Avrami(JMA)方程法得到再结晶体积分数实际值,采用3种不同的再结晶体积分数预报模型对实验数据进行回归,并对再结晶体积分数实测值和预报值进行对比。结果表明,Epsilon-S/Epsilon-C模型精度最高,Epsilon-S模型精度次之,Epsilon-P模型精度最差。
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| 关 键 词： | Q345B 动态再结晶 加工硬化率 动力学模型 |
| 收稿时间： | 2011/7/13 0:00:00 |
Study of dynamic recrystallization of Q345B steel |
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| Authors: | Yang Jing Xu Guang Han Bin Bu Conghua and Zou Hang |
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| Institution: | 1(1.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology,Wuhan 430081,China; 2.Research and Development Center,Wuhan Iron and Steel Corporation,Wuhan 430080,China) |
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| Abstract: | Single-pass compression deformation tests of Q345B steel were conducted on Gleeble 1500 hot simulator.Deformation values of the steel including critical strain,peak strain and steady strain were obtained according to the stain-stress data and work hardening data.The Zener-Hollomon parameter equation was given and status diagram of dynamic recrystallization(DXR) was plotted.Then measured DXR values were calculated by the method of Johnson-Mehl-Avrami(JMA).Three different DXR models were fitted with test data,and it is shown by the comparison of measured and predicted DXR values that the model considering steady and critical strain has the highest accuracy. |
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| Keywords: | Q345B dynamic recrystallization work hardening rate dynamic model |
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