Influence of Strain Rate on Grain Size Dependence of Strength of Sheet Steel.
Influence of Strain Rate on Grain Size Dependence of Strength of Sheet Steel.
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应变率对钢板强度晶粒尺寸依赖性的影响。
DOI：
10.2472/jsms.47.1053
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
S. Tanimura
中科院分区：
文献类型：
--
作者：
Miura Kazuya;S. Takagi;O. Furukimi;S. Tanimura
研究了440 MPa级和590 MPa级低碳钢及固溶硬化钢拉伸变形行为的晶粒尺寸依赖性与应变速率的关系。这些钢的晶粒尺寸为0.005 ~ 0.2mm。拉伸试验用Instron拉伸机在0.02/s和2/s的应变速率下进行，用分离式霍普金森压杆装置在2000/s下进行。屈服强度与晶粒尺寸的关系符合Hall-Petch关系，晶粒尺寸越小，在2000/s应变速率下变形时吸收的能量越大。440 MPa和590 MPa级钢屈服强度的晶粒尺寸依赖性随应变速率的增加而增强，而低碳钢屈服强度的晶粒尺寸依赖性几乎不受应变速率的影响。低碳钢的n值随应变速率的增加而显著降低。然而，晶粒尺寸并不影响n值。
Influence of strain rates on the grain size dependence of tensile deformation behavior was investigated on a mild steel and solid-solute hardened 440MPa and 590MPa grade steels. The grain size of these steels was ranged from 0.005mm to 0.2mm in diameter. Tensile tests were performed at strain rates of 0.02/s and 2/s with an Instron tensile machine, and at 2000/s with a split-Hopkinson pressure bar apparatus. The relationships between yield strength and grain size of the steels investigated were well represented by the Hall-Petch relationship, and the energy absorbed during deformation at the strain rate of 2000/s increased for finer grain size. The grain size dependence of the yield strength of the 440MPa and 590MPa grade steels was intensified with increase in strain rate, while, those of the mild steel were almost independent of the strain rate. The n-value of the mild steel was remarkably reduced with an increase of the strain rate. The grain size, however, didn't affect the n-value.