微观组织状态对Ti-6Al-4V合金动态力学性能和绝热剪切敏感性的影响

发布时间：2018-06-22 05:53

本文选题：Ti-Al-V合金 + 微观组织　；参考：《稀有金属》2016年12期

【摘要】：采用分离式霍普金森压杆装置(SHPB)技术,对Ti-6Al-4V合金的等轴组织、双态组织、片层组织进行高应变速率下的动态压缩实验,研究了不同组织状态的动态力学性能及其绝热剪切敏感性,并进行了金相观察及分析。结果表明:在动态压缩载荷条件下,Ti-6Al-4V合金3种组织的真应力-应变曲线大致分为弹性阶段和塑性阶段,没有出现明显的屈服阶段,3种组织试样在高应变率条件下,表现出一定的应变率强化效应,但是应变强化效应不明显;在较大的应变率下,不同组织状态下的试样表现出一个共同的特征,即平均应变都较小,但其应力值却较大;等轴组织的动态压缩力学性能优于其他两种组织;从试样的横剖面和轴剖面的分析来看,不同组织对Ti-6Al-4V合金的绝热剪切敏感性有较大的影响,层片组织具有最大的绝热剪切敏感性,而等轴组织具有最小的绝热剪切敏感性,双态组织介于两者之间。
[Abstract]:The dynamic compression experiments of Ti-6Al-4V alloy at high strain rate were carried out by using split Hopkinson pressure bar (SHPB) technique. The dynamic mechanical properties and adiabatic shear sensitivity of different microstructures were studied and metallographically observed and analyzed. The results show that the true stress-strain curves of Ti-6Al-4V alloy can be divided into elastic stage and plastic stage under dynamic compression loading. It shows a certain strain rate strengthening effect, but the strain strengthening effect is not obvious. Under the larger strain rate, the specimen under different microstructure shows a common characteristic, that is, the average strain is smaller, but the stress value is larger. The dynamic compressive mechanical properties of the isometric microstructure are superior to those of the other two kinds of microstructures, and from the analysis of the cross section and axial section of the specimen, it is found that different structures have great influence on the adiabatic shear sensitivity of Ti-6Al-4V alloy. The lamellar structure has the largest adiabatic shear sensitivity, while the equiaxed structure has the least adiabatic shear sensitivity, and the bimodal structure is somewhere between the two.
【作者单位】：沈阳工业大学材料科学与工程学院;
【基金】：辽宁省教育厅创新团队项目(LT2013004)资助
【分类号】：TG146.23

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