Low-cycle dwell-time fatigue in Ti-6242
Low-cycle dwell-time fatigue in Ti-6242
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DOI：
10.1007/s11661-999-0246-y
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发表时间：
1999-07
期刊：
影响因子：
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通讯作者：
M. E. Kassner;Y. Kosaka;J. S. Hall
中科院分区：
文献类型：
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作者：
M. E. Kassner;Y. Kosaka;J. S. Hall
对Ti-6Al-2Sn-4 Zr-2 Mo-0.1Si（Ti-6242）进行了室温、低周停留时间和常规低周疲劳试验。试样在低于β转变的各种温度下进行固溶退火，以控制初级α相的体积分数，随后进行喷丸处理。测定了初生α相的变化对低周停留时间疲劳寿命（LCDF）的影响，并与合金的常规低周疲劳（LCF）性能进行了比较。120秒的停留时间显著减少了失效循环次数，尽管从停留时间开始LCF的系数降低，一般来说，随着应力的降低而减少。与较低固溶温度相关的初生α相的增加似乎增加了对低循环停留时间疲劳的敏感性。它也出现了驻留疲劳的敏感性可能与环境温度，时间依赖性，循环（蠕变）塑性。
Ambient-temperature, low-cycle dwell-time and conventional low-cycle fatigue tests were performed on Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242). Specimens were solution annealed at various temperatures below the beta transus to control the volume fraction of primary alpha phase and were subsequently shot-peened. The influence of the changes in primary alpha phase on the low-cycle dwell-time fatigue life (LCDF) were determined and compared to the conventional low-cycle fatigue (LCF) properties of the alloy. A 120-second dwell significantly decreased the number of cycles to failure, although the factor decrease of LCF from a dwell, in general, diminished with decreasing stress. The Increasing primary alpha phase associated with lower solution temperatures appears to increase susceptibility to low-cycle dwell-time fatigue. It also appears that the susceptibility to dwell fatigue may be associated with ambient-temperature, time-dependent, cyclic (creep) plasticity.