| 引用本文: | 宋剑锋,张文志,董永刚.41Cr4钢高温加工过程流变应力模型建立[J].材料科学与工艺,2010,18(1):137-140.DOI:10.11951/j.issn.1005-0299.20100130. |
| SONG Jian-feng,ZHANG Wen-zhi,DONG Yong-gang.Model establishment for flow stress of 41Cr4 steel in hot working[J].Materials Science and Technology,2010,18(1):137-140.DOI:10.11951/j.issn.1005-0299.20100130. |
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| 摘要: |
| 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. |
| 关键词: 流变应力 物理模拟 41Cr4钢 加工硬化 动态回复 动态再结晶 |
| DOI：10.11951/j.issn.1005-0299.20100130 |
| 分类号:TG142.15 |
| 基金项目: |
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| Model establishment for flow stress of 41Cr4 steel in hot working |
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SONG Jian-feng, ZHANG Wen-zhi, DONG Yong-gang
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College of mechanical engineering,Yanshan University,Qinhuangdao Hebei 066004,China
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| Abstract: |
| 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 beginning of deformation,the dislocation density increases quickly,so the flow-stress increases quickly. Therefore,the phenomenon of work hardening occurs. With the cumulation of strain,the increasing velocity of flowstress 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 dynamic recrystallization on the flow stress. Compared with the experimental data,it is proved that the model established is effective and can be used in practice. |
| Key words: flow stress physical simulation 41Cr4 steel work hardening dynamic recovery dynamic recrystallization |
