TY - JOUR
T1 - Competing crack initiation behaviors of a laser additively manufactured nickel-based superalloy in high and very high cycle fatigue regimes
AU - Yang, Kun
AU - Huang, Qi
AU - Wang, Qingyuan
AU - Chen, Qiang
N1 - Funding Information:
The financial support from the National Natural Science Foundation of China (Nos. 11832007 , 11572057 , 11772209 , and 11602038 ) is gratefully acknowledged. Moreover, Dr. Kun Yang highly appreciates the support of the JSPS Postdoctoral Fellowship for Overseas Researchers (No. P19730 ). Finally, the authors thank Dr. Yong Jie Liu and Dr. Chao He for their assistances in fatigue experiments.
Funding Information:
The financial support from the National Natural Science Foundation of China (Nos. 11832007, 11572057, 11772209, and 11602038) is gratefully acknowledged. Moreover, Dr. Kun Yang highly appreciates the support of the JSPS Postdoctoral Fellowship for Overseas Researchers (No. P19730). Finally, the authors thank Dr. Yong Jie Liu and Dr. Chao He for their assistances in fatigue experiments.
PY - 2020/7
Y1 - 2020/7
N2 - Ultrasonic fatigue tests were performed to investigate high and very high cycle fatigue behaviors of a laser additively manufactured Inconel 718 (IN718) alloy in the as-deposited condition. The results indicate that the competition failure behavior between the surface and interior crack initiation results in the separate S-N curve. Both manufacturing defects (e.g., gas pore, lack of fusion) and columnar grains (matrix) observed in the microstructure could act as the original fatigue micro-cracks due to the effective restriction on manufacturing defects. The fatigue sensitivity levels increase successively in terms of the type, size, and location of the maximal micro-crack.
AB - Ultrasonic fatigue tests were performed to investigate high and very high cycle fatigue behaviors of a laser additively manufactured Inconel 718 (IN718) alloy in the as-deposited condition. The results indicate that the competition failure behavior between the surface and interior crack initiation results in the separate S-N curve. Both manufacturing defects (e.g., gas pore, lack of fusion) and columnar grains (matrix) observed in the microstructure could act as the original fatigue micro-cracks due to the effective restriction on manufacturing defects. The fatigue sensitivity levels increase successively in terms of the type, size, and location of the maximal micro-crack.
UR - http://www.scopus.com/inward/record.url?scp=85081652957&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85081652957&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2020.105580
DO - 10.1016/j.ijfatigue.2020.105580
M3 - Article
AN - SCOPUS:85081652957
VL - 136
JO - International Journal of Fatigue
JF - International Journal of Fatigue
SN - 0142-1123
M1 - 105580
ER -