铀-钛合金高温拉伸性能研究

测试了铸态高碳和低碳铀-钛合金从室温～800℃温度范围内的拉伸性能.结果表明:室温下低碳铀-钛合金的拉伸性能优于高碳铀-钛合金.随着温度升高,两种合金的强度下降;塑性在低于500℃时变化不大,高于500℃后随温度上升而增加.在700℃附近,高碳铀-钛合金的塑性明显降低,而低碳铀-钛合金的塑性增长减缓.这是由于在该温度下,合金中产生了β相.此外,高碳铀-钛合金中存在较多的碳化钛夹杂物,也是导致其晶间强度下降的一个因素.

Effect of carbon content on tensile property of U-Ti alloys at elevated temperature

High-temperature tensile properties of high carbon and low carbon U-Ti alloys have been studied .Their strength and plasticity were also determined in the range from room temperature to 800℃.The results indicate that the tensile properties of a low carbon U-Ti alloy is better than that of a high carbon U-Ti alloy at room temperature. Their strengthes decrease with the rise of temperature. Their plasticities change little from room temperature to 500℃, but increases rapidly with the rise of temperature above 500℃.At about 700℃, the rate of increase of low carbon U-Ti alloys' plasticity slows and high carbon U-Ti alloys' plasticity decreases clearly.The reason is that the β-phase is produced in the alloys at 700 ℃.Furthermore, much impurities of TiC in high carbon U-Ti alloys make the strength of grain boundaries drop.ure .Theirplasticitieschangelit