高强钛合金抗拉强度的理论计算

Theoretical Calculation for Tensile Strength of High Strength Titanium Alloys

利用高强钛合金相及相界面电子结构参数的统计值、结合制备工艺及相变,提出高强钛合金抗拉强度理论计算公式,即高强钛合金的抗拉强度应为基体β-Ti的强度与合金元素的固溶强化、界面强化(涵盖析出强化)产生的强化强度增量之和。以西北有色金属研究院设计的高强亚稳β钛合金Ti-B20的实验研究为基础,分别计算Ti-B20合金在β相区固溶处理、α+β相区固溶处理及780℃固溶+时效处理后的抗拉强度,计算结果与实验研究符合较好。

By means of the statistical data of valence electron structure parameters of metallic phase and phase interfaces combined with the preparation technology and phase transformation,the theoretical calculation formulae for the tensile strength of high strength titanium alloys were put forward,i.e.,the tensile strength of high strength titanium alloys is the sum of strength of β-Ti and the strengthening strength increments caused by solid-solution strengthening and interface strengthening including precipitation strengthening of alloying element. Based on the experimental data of the high strength metastable β titanium alloy Ti-B20 developed by Northwest Institute for Nonferrous Metal Research,its tensile strength was calculated when it was treated by solid solution above β transus,below β transus and at 780 °C followed by aging,respectively. The calculation results agree well with the experimental results.