Long fatigue crack growth behavior of Ti–6Al–4V produced via high-power laser directed energy deposition

Yongming Ren, Xin Lin, Zengyun Jian, Haoran Peng, Weidong Huang

科研成果: 期刊稿件文章同行评审

26 引用 (Scopus)

摘要

The fatigue crack growth (FCG) behavior of long cracks was studied in Ti–6Al–4V alloy fabricated by high-power laser directed energy deposition. The results show the deposited parts under heat treated conditions have superior FCG resistance than that of the other reported additive manufactured Ti–6Al–4V, owing to the specimens with coarse prior-β grains and interior thick α-laths. Using linear elastic fracture mechanics and two (von Mises and Tresca) yielding criterions, we calculated the monotonic and cyclic plastic zone sizes, and found the FCG rates as a function of cyclic plastic zone sizes ahead of the crack tip during FCG region. A method was proposed to determine the typical microstructural characteristic unit of the additive manufactured Ti–6Al–4V parts with basket-weave structure, which shows the same length-scale as plastic zone sizes at the transition point in FCG curves.

源语言英语
文章编号141392
期刊Materials Science and Engineering: A
819
DOI
出版状态已出版 - 5 7月 2021

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