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

doi:10.1016/j.msea.2021.141392

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

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

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.

Original language	English
Article number	141392
Journal	Materials Science and Engineering: A
Volume	819
DOIs	https://doi.org/10.1016/j.msea.2021.141392
State	Published - 5 Jul 2021

Keywords

Additive manufacturing
Directed energy deposition
Fatigue crack growth
Plastic zone
Titanium alloy

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10.1016/j.msea.2021.141392

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

abstract = "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.",

keywords = "Additive manufacturing, Directed energy deposition, Fatigue crack growth, Plastic zone, Titanium alloy",

author = "Yongming Ren and Xin Lin and Zengyun Jian and Haoran Peng and Weidong Huang",

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doi = "10.1016/j.msea.2021.141392",

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TY - JOUR

T1 - Long fatigue crack growth behavior of Ti–6Al–4V produced via high-power laser directed energy deposition

AU - Ren, Yongming

AU - Lin, Xin

AU - Jian, Zengyun

AU - Peng, Haoran

AU - Huang, Weidong

PY - 2021/7/5

Y1 - 2021/7/5

N2 - 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.

AB - 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.

KW - Additive manufacturing

KW - Directed energy deposition

KW - Fatigue crack growth

KW - Plastic zone

KW - Titanium alloy

UR - https://www.scopus.com/pages/publications/85107294015

U2 - 10.1016/j.msea.2021.141392

DO - 10.1016/j.msea.2021.141392

M3 - 文章

AN - SCOPUS:85107294015

SN - 0921-5093

VL - 819

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

M1 - 141392

ER -

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

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Keywords

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