双相钛合金微观应力-应变分布的数值模拟

Numerical Simulation on Distribution of Micro Stress-Strain in Dual-Phase Titanium Alloys

摘要:

测量了α+β型Ti-8Mn双相钛合金的应力-应变曲线，设计了成分与Ti-8Mn双相钛合金中α和β相成分相近的单相α钛合金和β钛合金，根据这2个单相钛合金的应力-应变曲线，计算了Ti-8Mn双相钛合金的应力-应变曲线并与测量值进行了对比。结果表明：二者吻合得很好，说明所建立的有限元模型是有效的。根据上述模型，对在β相内存在一个α相的情况下，沿不同截面应力-应变的分布进行了数值模拟。结果表明：在外加应力的作用下，最小应力出现在中心α相内，最大应力出现在α-β边界，随着向两侧距离增加，应力值逐渐减小，而应变分布

Abstract:

The stress-strain curve of (α + β) Ti-8Mn alloys was measured, and α and β titanium alloys, whose compositions were close to those of α and β phase in the dual phase titanium alloy (Ti-8Mn) were designed. According to the above mentioned design, the stress-strain curve of Ti-8Mn alloy was calculated and compared with measuring one. The results show that they are in good agreement, which indicates that the model established is available. According to the model above, the distributions of stress and strain were simulated along different sections when only one α grain was distributed in the β crystal. And the result illustrates that the minimum stress exists at the center of α crystalline grain, while the maximum stress exists at the crystal boundary. The stress decreases gradually with increasing of the distance away to dual sides, while the distribution of strain is in opposition to the stress distribution.