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拉伸断裂极限值是预测零件高温裂纹的主要依据。为了研究工业纯钛在高温拉伸下的断裂极限,采用理论模型和试验相结合的方法,通过GFL(Gleeble fracture limit)试验测得工业纯钛在不同温度下的真应力-应变曲线,并利用真应力-应变曲线求得工业纯钛的断裂极限值,分析了温度和应变速率对断裂极限值的影响。结果表明,温度和应变速率对断裂极限值有较大影响。温度升高使断裂极限增加,在应变速率为0.1 s-1下随着温度从800℃升高到1000℃,断裂极限值从1.798增加到2.343;在900℃相同温度下,随着应变速率从0.01 s-1的提高到1 s-1,断裂极限值从2.496降低到1.745。
Tensile fracture limit is the main basis for predicting hot cracking of parts. In order to study the fracture limit of industrial pure titanium under high temperature tensile, the true stress-strain curves of industrial pure titanium at different temperatures were measured by GFL (Gleeble fracture limit) The true stress-strain curves obtained the rupture limit value of commercial pure titanium, and analyzed the influence of temperature and strain rate on the rupture limit value. The results show that the temperature and strain rate have a greater impact on the fracture limit. The increase of the temperature increases the fracture limit. The fracture limit increases from 1.798 to 2.343 as the temperature increases from 800 ℃ to 1000 ℃ at a strain rate of 0.1 s-1. With the same temperature of 900 ℃, 0.01 s-1 is increased to 1 s-1, and the fracture limit is reduced from 2.496 to 1.745.