研究了980℃和950℃2种温度轧制的BT25钛合金棒材的室、高温拉伸性能、热稳定性能以及持久性能.研究结果表明,所研究的2种温度下得到的轧制棒材的性能均满足用户提出的标准要求.它们的高温拉伸性能、冲击韧性相当,980℃轧制棒材的室温拉伸性能优于950℃轧制棒材,但后者的热稳定性优于前者,550℃热暴露100 h后,后者塑性降低程度较小.BT25钛合金棒材组织比较均匀,均为初生α相和条状β转变组织构成的双态组织,且变形温度较低时,组织较细小,合金的综合性能较高,尤其是热稳定性能较好.%Tensile properties both at ambient and high temperature, thermal stabilities and duration time for BT25 titanium alloy bars rolled at 980 ℃ and 950℃ , respectively were determined. The results indicate that the properties for all the bars can meet the requirements for the corresponding standards which put forward by the users. Tensile properties at 500℃ and 550℃ and impact toughness for the rolled bars are almost the same. Tensile properties at ambient temperature for bars rolled at 980 ℃. are superior to that of bars rolled at 950 ℃. Thermal stabilities for bars rolled at 950 ℃ are superior to that of bars rolled at 980 ℃. and ductility decrease for bars rolled at 950 ℃ which have been exposed at 950 ℃. for 100 h is less than bars rolled at 980 ℃. Uniform bimodal microstructures can be found for the two kinds of bars rolled at 980 ℃ and 950 ℃ , respectively, which are composed of primary and strip-like transformed. The lower the deformation temperature, the finer the microstructures and favorite comprehensive properties can be got, especially with good thermal stabilities.
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