Dynamic strength and failure behavior of titanium alloy Ti-6Al-4V for a variation of heat treatments
Dynamic strength and failure behavior of titanium alloy Ti-6Al-4V for a variation of heat treatments
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DOI：
10.1007/s11043-008-9060-y
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发表时间：
2008-07
影响因子：
2.5
通讯作者：
L. Meyer;L. Krüger;Kristin Sommer;T. Halle;M. Hockauf
中科院分区：
文献类型：
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作者：
L. Meyer;L. Krüger;Kristin Sommer;T. Halle;M. Hockauf
在我们的研究中，Ti-6Al-4V 样品经过时效处理的修改，其中固溶退火和最终时效的温度以及冷却速率发生变化。将钛合金在高于和低于β-转变温度下退火，然后在真空炉中冷却或通过水淬。此外，最终退火温度也发生变化。进行准静态和动态加载速率下的压缩测试以确定流动应力和应变硬化行为。此外，在室温下对 U 型缺口样品进行了仪器化夏比冲击试验，以监测变形和断裂的负载时间响应。讨论了所获得的高速机械性能并将其与当前的微观结构相关联。我们的结果揭示了微观结构对材料行为的强烈影响，并将有助于选择适当的热处理技术，特别是在必须考虑冲击载荷或安全结构的情况下。
In our study, samples of Ti-6Al-4V were subjected to modifications of an aging treatment where temperatures for solution annealing and final aging as well as the cooling rate were varied. The titanium alloy was annealed above and below theβ-transus temperature followed by cooling in a vacuum furnace or by water quenching. Additionally, the final annealing temperature was varied. Compression tests under quasistatic and dynamic loading rates were performed to determine the flow stress and strain hardening behavior. Furthermore, instrumented Charpy impact tests on U-notch specimen were performed at room temperature to monitor the load-time response of deformation and fracturing. The obtained high rate mechanical properties are discussed and correlated with the present microstructure. Our results reveal a very strong effect of the microstructure on the material behavior and will assist to choose the appropriate heat treatment technology, especially if impact loaded or safety structures have to be considered.