申发兰
,
陈明和
,
冯建超
宇航材料工艺
对TA15合金进行600～ 700℃下的应力松弛试验和675～800℃下的单向拉伸试验,研究其应力松弛行为的特征及影响因素,得出TA15合金在高温下的流变应力行为规律.结果表明,在600 ～ 700℃下TA15合金应力松弛行为可以分为两个阶段:第一阶段为应力松弛过程前100 s,试样内的残余应力快速下降；第二阶段残余应力下降缓慢,经过1 500s后剩余应力基本不变,趋向于某一个极限值；温度对应力松弛影响很大,温度越高,应力松弛越快；初应力、预应变、轧制方向对应力松弛影响不大,且随温度的升高影响变小.在675 ～800℃下TA15合金流变应力随温度的升高而降低,通过对单拉试验数据进行拟合,得出TA15合金流动应力符合第一类本构方程.
关键词:
TA15合金
,
应力松弛
,
流变应力
Yong LIU
,
Jingchuan ZHU
,
Zhongda YIN
,
Mingwei LI
材料科学技术（英文）
The effect of triple annealing on stress relaxation of Ti-6Al-4V alloy as well as the microstructure after stress relaxation were studied. The results showed that triple annealing treatment enhanced the resistance of stress relaxation performance, and when the temperature was rising, this effect became notable. The stress relaxation deformation mechanism is of dislocation creep at 400℃ and recovery creep at 600℃.
关键词:
Triple annealing
,
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