为了获得高温加工过程中41Cr4钢的动态再结晶体积百分数、真应力、真应变以及稳态应力和稳态应变,在不同变形温度、变形量和变形速度条件下,在GLEEBLE 3500试验机上完成了物理模拟试验.实验结果表明:变形刚开始时位错密度增大较快,因此应力迅速增大,产生加工硬化过程,随着应变的累积,动态回复的发生导致应力增加速度减慢,当应变进一步增大到超过临界应变时,动态再结晶软化导致流变应力降低.在此基础上建立41Cr4钢的流变应力模型时,考虑了加工硬化、动态再结晶以及动态回复对流变应力的影响,给出了与实验值比较接近的41Cr4钢的流变应力模型.
For obtaining the volume fraction of dynamic recrystallization, true-stress, true-strain, peak-stress , peak-strain of 41Cr4 steel in the hot working, a physical simulation test was performed by GLEEBLE 3500 subject under conditions of different temperatures, strain and strain rates. The result indicates that in the be-ginning of deformation, the dislocation density increases quickly, so the flow-stress increases quickly, There-fore, the phenomenon of work hardening occurs. With the cumulation of strain, the increasing velocity of flow-stress becomes slow little by little. When the strain rises to exceed the critical strain, the flow-stress decreases for the dynamic recrystallization softening. Based on this physical simulation test, a novel model for flow stress of 41Cr4 steel is established with consideration of the influence of work hardening, dynamic recovery and dy-namic recrystallization on the flow stress. Compared with the experimental data, it is proved that the model es-tablished is effective and can be used in practice.
参考文献
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