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对工业纯钛TA2在150℃(精对苯二甲酸装置钛冷凝器的工作温度)下的蠕变行为进行了研究。单轴拉伸蠕变试验结果表明,150℃下TA2材料蠕变第1阶段服从指数规律ε=βta。第1阶段蠕变衰减速度(时间指数a值)分别在160~200MPa和220~240MPa的试验应力范围内呈分阶段恒定的趋势。在较低的应力条件下(低于200MPa),蠕变第1阶段的衰减速度较大,第2阶段存在蠕变饱和现象,且随着应力的降低,达到饱和所需的时间缩短。由此可以推论,第2阶段蠕变饱和的出现与第1阶段蠕变衰减速度密切相关,且在低温和较低的应力条件下,蠕变行为主要以第1阶段为主。
The creep behavior of commercial pure titanium TA2 at 150 ° C (operating temperature of the smelting terephthalic acid plant) was investigated. The results of uniaxial tensile creep tests show that the first stage of TA2 creep at 150 ℃ obeys exponential law ε = βta. The first stage of creep decay velocity (time index a value) in the 160 ~ 200MPa and 220 ~ 240MPa test stress range showed a steady trend in stages. At lower stresses (less than 200 MPa), the first stage of creep decays more slowly, while the second stage creeps and saturates. As the stress decreases, the time required to reach saturation is reduced. It can be inferred that the creep saturation in Stage 2 appears to be closely related to the Stage 1 creep decay rate. Under low temperature and low stress conditions, creep behavior is mainly dominated by Stage 1.