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本文利用现有数据,对Ti-6Al-4V合金的高温、室温蠕变性能及蠕变断裂性能进行了综合分析。分析结果表明,该合金长时间使用的极限温度为300℃或稍高于300℃;在300℃以下,退火状态的合金,同一温度的蠕变强度σ_(0.1)/100与屈服强度σ_(0.1)大致可用σ_(0.1)/100=1.355+0.836σ_(0.1)表示。200～400℃之间,σ_(100)与σ_b之比约为0.92～0.96。该合金存在着明显的室温蠕变现象,某些零部件不宜在高于90％屈服强度的应力下长期使用。显微组织对该合金的蠕变性能具有明显影响,β-加工或处理、淬火时效等可以提高其蠕变性能。
In this paper, the existing data were used to analyze the high temperature, room temperature creep properties and creep rupture properties of Ti-6Al-4V alloy. The results show that the ultimate temperature of the alloy for long time use is 300 ℃ or slightly higher than 300 ℃. When the alloy is annealed at 300 ℃, the creep strength σ 0.1 / 100 and the yield strength σ 0.1 ) Can be roughly represented as σ_ (0.1) /100=1.355+0.836σ_ (0.1). 200 ~ 400 ℃, the ratio of σ_ (100) to σ_b is about 0.92 ~ 0.96. The alloy has obvious creep phenomenon at room temperature, some parts should not be used at higher than 90% yield strength under long-term stress. The microstructure of the alloy creep properties have a significant impact, β-processing or processing, quenching aging can improve its creep properties.