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在改装了的拉力试验机上测量了纯铁在范性形变过程中的内耗。研究了拉伸速率(在0.73×10~(-6)-50×10~(-6)/秒范围内)、测量频率(在0.3—3.6/秒范围内)、应变退火及含碳量等对纯铁范性形变过程中内耗的影响。所得结果表明,在屈服平台上,范性形变过程中内耗基本不变,且其值随范性形变速率的增加和测量频率倒数的增加而线性增加。将实验结果与范性形变过程内耗的位错动力学模型所得出的定量关系式进行了对比,得到了满意的符合。求得了退火纯铁在屈服平台上的位错动力学指数为10.8—12.3。 还讨论了形变过程内耗的位错动力学模型的适用范围。
The internal friction of pure iron in the process of normal deformation was measured on a modified tensile tester. The tensile rate (in the range of 0.73 × 10 -6 -650 / 10 -6 / s), the measurement frequency (in the range of 0.3-3.6 / s), strain annealing and carbon content Effect of Internal Consumption on the Normal Deformation of Pure Iron. The results show that on the yield platform, the internal friction during the normal deformation process is basically unchanged, and its value increases linearly with the increase of the normal deformation rate and the inverse of the measured frequency. The experimental results are compared with the quantitative relation obtained by the dislocation kinetic model of internal deformation during the process of the normal deformation, and the satisfactory agreement is obtained. The dislocation kinetic index of annealed pure iron on the yield platform was obtained as 10.8-12.3. The application of the dislocation kinetic model of internal friction during deformation is also discussed.