| 脉冲磁场处理对SKD11模具钢残余拉应力的影响机理分析 |
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| 引用本文： | 罗丞,李正龙,曹洪志,张祥林. 脉冲磁场处理对SKD11模具钢残余拉应力的影响机理分析[J]. 中国机械工程, 2016, 27(11): 1535 |
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| 作者姓名： | 罗丞 李正龙 曹洪志 张祥林 |
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| 作者单位： | 华中科技大学材料成形与模具技术国家重点实验室，武汉，430074 |
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| 基金项目： | 湖北省重大专项（2015BAA015）；国家科技重大专项（2009ZX04014-073-04） |
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| 摘 要： | 为了探究脉冲磁场处理对SKD11钢残余应力的影响机理，设计了单因素试验并得到了磁场强度、磁场频率、磁场方向以及磁处理时间等参数单独变化时试样残余拉应力的变化结果。同时从应力的本质入手，将磁处理过程划分为位错塞积开动和位错增殖两个阶段来分析，对试验现象做出了全面解释，推导出了在第一阶段中使位错塞积群克服点阵阻力所需的临界磁场强度Hp的公式，以及在第二阶段中使单个弗兰克-瑞德位错源增殖所需的临界磁场强度Hc的公式和使单个位错克服点阵阻力所需的临界磁场强度H'-p的公式。最后，以试验结果和理论推导为依据，建立了脉冲磁场处理在冲压模具的应用中需要遵循的原则。
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| 关 键 词： | SKD11钢 脉冲磁场处理 残余拉应力 位错 冲压模具 |
Influence Mechanism of Residual Tensile Stress in SKD11 Steel Caused by Pulse Magnetic Field Treatment |
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| Luo Cheng,Li Zhenglong,Cao Hongzhi,Zhang Xianglin. Influence Mechanism of Residual Tensile Stress in SKD11 Steel Caused by Pulse Magnetic Field Treatment[J]. China Mechanical Engineering, 2016, 27(11): 1535 |
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| Authors: | Luo Cheng Li Zhenglong Cao Hongzhi Zhang Xianglin |
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| Affiliation: | State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology,Wuhan,430074 |
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| Abstract: | Sevel single factor experiments were designed to explore the influence mechanism of residual tensile stress in the SKD11 steel by PMT.When the magnetic field strength, the magnetic field frequency, magnetic field direction and the processing time were varied individually,the changes of residual tensile stress in the sample were obtained.All experimental phenomena were explained from the angle of dislocation-nature of the stress. Process of PMT was divided into two stages in the explanation. The first stage was un-piling of the dislocation pile-up group and the second was multiplication of dislocation. Formula of Hp was deduced and Hp was the critical magnetic field strength which started the un-piling of dislocation pile-up group in the first stage. Formula of Hc and H'-pwere deduced. In the second stage,Hc was the critical magnetic field strength which started multiplication of a single Frank-Read dislocation source and H'-p was the critical magnetic field strength which made a single dislocation overcome the lattice resistance. The principals of PMT in the applications to stamping die were established based on the experiments and the theory. |
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| Keywords: | SKD11 steel pulse magnetic field treatment(PMT) residual tensile stress dislocation stamping die |
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