Very high cycle fatigue behavior of laser powder bed fusion additively manufactured Ti6Al4V alloy at elevated temperature

被引：10
作者：
Peng, Haotian [1 ,2 ]
Liu, Fulin [1 ,3 ]
Chen, Yao [1 ,2 ]
He, Chao [1 ,2 ]
Li, Lang [1 ,2 ]
Zhang, Hong [1 ,2 ]
Wang, Chong [1 ,2 ]
Wang, Qingyuan [1 ,2 ]
Liu, Yongjie [1 ,2 ]
机构：
[1] Coll Architecture & Environm, Failure Mech & Engn Disaster Prevent Key Lab Sichu, Chengdu 610207, Peoples R China
[2] Sichuan Univ, Coll Architecture & Environm, MOE Key Lab Deep Earth Sci & Engn, Chengdu 610065, Peoples R China
[3] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 171卷
关键词：
Laser powder bed fusion; Ti6Al4V alloy; Very high cycle fatigue; Crack initiation; High temperature; ALPHA/BETA-TITANIUM-ALLOY; CRACK INITIATION; TI-6AL-4V; STRENGTH; SLIP; PROPAGATION; MECHANISM; DEFECTS; FAILURE; GROWTH;
D O I：
10.1016/j.ijfatigue.2023.107599
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The crack initiation mechanism of laser powder bed fusion (LPBF) Ti6Al4V was investigated at elevated tem-perature up to very high cycle fatigue (VHCF) regime. The competition concerning defect location is elaborated using the stress intensity factor range and Z-parameter model. Additionally, localized high stress near the defects is responsible for plastic strain localization in the non-prior alpha' region, following the grain refinement and fragmentation in the larger grains nearby, which is strongly associated with the formation of microcracks and fine granular area. Meanwhile, the process is facilitated by reducing dislocation resistance and activating mul-tiple slip systems due to high temperature.
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页数：16
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