Formability and microstructure evolution of Ti-6Al-4 V alloy in electric hot incremental forming
Formability and microstructure evolution of Ti-6Al-4 V alloy in electric hot incremental forming
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DOI：
10.1007/s00170-021-08583-1
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
Chengxin Liu;Honggang Duan;X. Chu;He Li;Zhiyong Zhao;Dongwei Ao
中科院分区：
文献类型：
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作者：
Chengxin Liu;Honggang Duan;X. Chu;He Li;Zhiyong Zhao;Dongwei Ao
在自行搭建的实验平台上，对Ti-6Al-4合金的电热渐进成形进行了研究。刀头温度分别控制在300~500℃。研究了温度对Ti-6Al-4-V成形件的硬度、成形性及组织演变的影响。结果表明，随着温度的升高，合金的成形性提高。室温下平均断口深度为5.6 mm。当刀头控制在300和500℃时，成形零件的平均断裂深度分别为12.6和21.0 mm，分别增加了125%和275%。在500℃时成形的组织演变表明，随着成形深度的增加，β相的比例逐渐增加。此外，在500℃时，组织更加均匀。硬度测试结果也证实了高温削弱了成形构件不同方向的力学性能差异。然而，高温恶化了润滑条件，增加了成形零件的表面粗糙度。
Based on a self-built experiment platform, the research of electric hot incremental forming (EHIF) of Ti-6Al-4 V alloy was carried out. The temperature of the tool head was controlled at 300–500 ℃, respectively. The effects of temperature on the hardness and formability of Ti-6Al-4 V formed components and the microstructure evolution were investigated. The results showed that the formability increased with the increasing temperature. Average fracture depth of 5.6 mm was obtained at room temperature. When the tool head was controlled at 300 and 500 ℃, the average fracture depths of the formed components were 12.6 and 21.0 mm, which were increased by 125% and 275%, respectively. Microstructure evolution of the components formed at 500 ℃ showed that the ratio of β phase increased gradually as the forming depth increased. In addition, the microstructure was more uniform at 500 ℃. The hardness test results also confirmed that high temperature weakens the mechanical performance difference in different directions of the formed components. However, high temperature deteriorated the lubricant condition and increased the surface roughness of the formed components.