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High Temperature Fatigue Crack Growth Behavior of Ti-6Al-4V

机译:Ti-6Al-4V的高温疲劳裂纹扩展行为

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摘要

Experimental evaluation of high temperature, Fatigue Crack Growth Rate (FCGR) data for Ti-6Al-4V, a titanium alloy, is presented. The FCGR data were measured at room temperature, 175, 230, 290 and 345℃ using the Direct Current Potential Difference (DCPD) technique. Compact Tension (CT) specimens were used in the program and crack growth rates (da/dN) vs. Mode I stress intensity factor ranges (AK) were plotted as a function of temperature. A temperature rise from 175 to 345℃ did not cause a substantial increase in crack growth rates within the Stage II region where a linear relationship describes the behavior. Formation of secondary cracks, observed at higher temperatures, may have slowed the crack propagation as observed in the fractography.
机译:给出了钛合金Ti-6Al-4V的高温,疲劳裂纹扩展率(FCGR)数据的实验评估。使用直流电势差(DCPD)技术在室温,175、230、290和345℃下测量FCGR数据。在程序中使用了紧凑拉伸(CT)标本,并根据温度绘制了裂纹扩展速率(da / dN)与模式I应力强度因子范围(AK)的关系图。从175℃升至345℃的温度并没有引起第二阶段区域内裂纹扩展速率的大幅增加,在第二阶段区域内线性关系描述了行为。高温下观察到的二次裂纹的形成可能减慢了裂纹扩展过程中观察到的裂纹扩展。

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