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| Ti-3Al基合金高温变形行为及其流动应力模型 |
| High Temperature Deformation Behavior and Flow Stress Model of Ti-3Al Based Alloy |
| Received:September 10, 2012 Revised:November 10, 2012 |
| DOI： |
| 中文关键词: Ti-3Al基合金 流动应力-应变曲线 逐步回归 流动应力模型 |
| 英文关键词: Ti-3Al based alloy flow stress-strain curve stepwise regression flow stress model |
| 基金项目:江西省教育厅科技项目（GJJ11156）； 轻合金加工科学和技术国防重点学科实验室开放基金（GF200901008） |
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| 中文摘要: |
| 在Thermecmastor-Z 型热模拟试验机上对Ti-3Al 基合金进行等温恒应变速率压缩实验，实验选取的变形温度范围为950～1350 ℃，应变速率范围为0.001～10 s-1，高度压下量为70%。利用实验数据绘制出流动应力-应变曲线，研究了Ti-3Al 基合金的高温变形行为，并运用逐步回归方法构建出该合金的流动应力模型。结果表明，Ti-3Al 基合金的流动应力随着应变速率的增加而升高，随温度的升高而降低。误差分析表明，该流动应力模型具有较高的精度，可用于指导Ti-3Al基合金热加工工艺的制定。 |
| 英文摘要: |
| The hot compression tests of Ti-3Al based alloy were carried out in the temperature range of 950~1350 ℃ and strain rate range of 0.001~10.0 s-1 up to a height reduction of 70% using a Thermermastor-Z simulator. The flow stress-strain curves were plotted using hot compression experimental data, and the high temperature deformation behavior of Ti-3Al based alloy was investigated, and the flow stress model of Ti-3Al based alloy was constructed by adopting stepwise regression method. The results show that flow stresses of Ti-3Al based alloy increase with increasing strain rates and decreasing temperatures. Error analysis shows that flow stress model can exactly predict flow stresses of Ti-3Al based alloy in different deformation conditions and can be applied in the design of the hot working process. |
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