TY - JOUR
T1 - Effects of the building direction on fatigue crack growth behavior of Ti-6Al-4V manufactured by selective laser melting
AU - Sun, Wenbo
AU - Ma, Yu'E
AU - Ai, Xiaopeng
AU - Li, Jianghai
N1 - Publisher Copyright:
© 2018 The Authors.
PY - 2018
Y1 - 2018
N2 - Additive manufacturing selective laser melting (AM-SLM) are potential to be widely used in aircraft structural components. There are apparent layers along the building direction of titanium alloy samples manufactured by SLM. This will affect its fatigue properties. At present, few papers about effects of the building direction on fatigue crack growing behavior have been published. In this work, three kinds of titanium alloy Compact Tension (C(T)) specimens with different building directions were designed. Fatigue crack growth rate (FCGR) tests were performed. And fatigue crack growth rate versus stress intensity factor range (da/dN -ΔK) curves were obtained and then effects of the building direction on crack growth was analyzed. It is shown that FCGR of specimen with 90°building direction is the fastest, and then that of the 0°sample is slower, and 45°sample is the slowest. Fatigue life of 45°specimen is 1.49 times longer and 1.46 times longer than that of 90°and 0°specimen separately. Fracture morphology of samples was studied. It shows that the fracture surface with 0°building direction is smooth and fatigue striations are observed. The fracture surface with 45°building direction has a slope along the thickness. The fracture surface of the sample with 90°is cluttered, and its building layers can be observed. But its fatigue striations are not clear.
AB - Additive manufacturing selective laser melting (AM-SLM) are potential to be widely used in aircraft structural components. There are apparent layers along the building direction of titanium alloy samples manufactured by SLM. This will affect its fatigue properties. At present, few papers about effects of the building direction on fatigue crack growing behavior have been published. In this work, three kinds of titanium alloy Compact Tension (C(T)) specimens with different building directions were designed. Fatigue crack growth rate (FCGR) tests were performed. And fatigue crack growth rate versus stress intensity factor range (da/dN -ΔK) curves were obtained and then effects of the building direction on crack growth was analyzed. It is shown that FCGR of specimen with 90°building direction is the fastest, and then that of the 0°sample is slower, and 45°sample is the slowest. Fatigue life of 45°specimen is 1.49 times longer and 1.46 times longer than that of 90°and 0°specimen separately. Fracture morphology of samples was studied. It shows that the fracture surface with 0°building direction is smooth and fatigue striations are observed. The fracture surface with 45°building direction has a slope along the thickness. The fracture surface of the sample with 90°is cluttered, and its building layers can be observed. But its fatigue striations are not clear.
KW - Additive manufacturing selective laser melting
KW - Building directions
KW - Fatigue crack growth
KW - Fracture surface
KW - Titanium alloy
UR - http://www.scopus.com/inward/record.url?scp=85064678025&partnerID=8YFLogxK
U2 - 10.1016/j.prostr.2018.12.190
DO - 10.1016/j.prostr.2018.12.190
M3 - 会议文章
AN - SCOPUS:85064678025
SN - 2452-3216
VL - 13
SP - 1020
EP - 1025
JO - Procedia Structural Integrity
JF - Procedia Structural Integrity
T2 - 22nd European Conference on Fracture, ECF 2018
Y2 - 25 August 2018 through 26 August 2018
ER -