Dynamic Compression Properties of Ti-6Al-4V Titanium Alloy Extruded Sections
Dynamic Compression Properties of Ti-6Al-4V Titanium Alloy Extruded Sections
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DOI：
10.4028/www.scientific.net/msf.898.199
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
Rui Liu;S. Hui;W. Ye;Yang Yu;X. Song
中科院分区：
文献类型：
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作者：
Rui Liu;S. Hui;W. Ye;Yang Yu;X. Song
研究了Ti-6Al-4V钛合金型材的动态压缩性能。Ti-6Al-4V型材在β转变温度以上以85倍挤压比挤压，然后采用750°C常规退火和1200°C退火两种方式进行热处理。利用分离式霍普金森压杆系统研究了材料在应变速率为3000±200 s-1时的动态压缩性能。结果表明，挤压态试样的动态压缩性能与750°C常规退火后的试样相当。与常规退火获得的原始β晶粒尺寸为200 μm ~ 300 μm的魏氏组织相比，1200°C退火获得的由细小α-薄片组成的粗晶粒组织具有相当的动态强度，但塑性变形能力降低约20%。1200°C退火得到的粗晶组织为粗大的α-层状组织，其动态强度略有下降，塑性变形能力下降约60%。
This paper aimed to study the dynamic compression properties of Ti-6Al-4V titanium alloy sections. The Ti-6Al-4V sections were extruded above the β-transus temperature with extruding ratio of 85, and then heat treated by conventional annealing at 750°C, or annealing at 1200°C by two routes. Dynamic compression properties were investigated by Split Hopkinson Pressure Bar system at strain rate of 3000±200 s-1. The results show that the dynamic compression properties of as-extruded specimens are comparable to the specimens after conventional annealing at 750°C. Compared to Widmannstatten microstructure with original beta grains in size of 200 μm ~ 300 μm obtained by conventional annealing, the microstructure obtained by annealing at 1200°C with coarse grains consisted of fine α-lamellae exhibits comparable dynamic strength but the capability of plastic deformation reduced about 20%. For the microstructure obtained by annealing at 1200°C with coarse grains consisted of coarse α-lamellae, the dynamic strength slightly decreased, while the capability of plastic deformation reduced about 60%.