TY - JOUR
T1 - Dynamic constitutive behavior of LPBFed metal alloys
AU - Alkhatib, Sami E.
AU - Xu, Shanqing
AU - Lu, Guoxing
AU - Karrech, Ali
AU - Sercombe, Timothy B.
N1 - Funding Information:
The authors would like to thank the Australian Government Research Training Program Scholarship from The University of Western Australia.
Publisher Copyright:
© 2023 The Author(s)
PY - 2023/7/1
Y1 - 2023/7/1
N2 - Laser powder bed fused (LPBFed) metal alloys, such as titanium, aluminium, and steel exhibit high specific strength and hold great potential for utilization in the automotive and aerospace sectors. Since automotive and aerospace structures require the materials to withstand dynamic impacts, accurately predicting the flow behavior of LPBF-based alloys under high strain rates becomes critical. In this paper, the dynamic behavior of LPBFed CPTi, AlSi10Mg, and 316L stainless steel under strain rates of approximately 500–3000 s−1 was investigated using a Split Hopkinson Pressure Bar (SHPB). The study compared the stress-strain response and strain rate sensitivity of LPBFed alloys to those of conventionally produced counterparts. Furthermore, Johnson-Cook constitutive model was adopted to predict the flow behavior. The results showed that all alloys exhibit positive strain rate sensitivity under the tested strain rate range, with LPBFed CPTi demonstrating higher flow stress than conventionally built counterparts due to the fine grain size resulting from the additive manufacturing method. Additionally, differences in the performance of AlSi10Mg observed in this study, as compared to the literature, are attributed to differences in building direction and post-processing. Finally, it was demonstrated that the Johnson-Cook model accurately predicts flow behavior for the selected alloys with relatively low error.
AB - Laser powder bed fused (LPBFed) metal alloys, such as titanium, aluminium, and steel exhibit high specific strength and hold great potential for utilization in the automotive and aerospace sectors. Since automotive and aerospace structures require the materials to withstand dynamic impacts, accurately predicting the flow behavior of LPBF-based alloys under high strain rates becomes critical. In this paper, the dynamic behavior of LPBFed CPTi, AlSi10Mg, and 316L stainless steel under strain rates of approximately 500–3000 s−1 was investigated using a Split Hopkinson Pressure Bar (SHPB). The study compared the stress-strain response and strain rate sensitivity of LPBFed alloys to those of conventionally produced counterparts. Furthermore, Johnson-Cook constitutive model was adopted to predict the flow behavior. The results showed that all alloys exhibit positive strain rate sensitivity under the tested strain rate range, with LPBFed CPTi demonstrating higher flow stress than conventionally built counterparts due to the fine grain size resulting from the additive manufacturing method. Additionally, differences in the performance of AlSi10Mg observed in this study, as compared to the literature, are attributed to differences in building direction and post-processing. Finally, it was demonstrated that the Johnson-Cook model accurately predicts flow behavior for the selected alloys with relatively low error.
KW - 316LSS
KW - AlSi10Mg
KW - CP-Ti
KW - High strain rate
KW - Johnson-cook model
UR - http://www.scopus.com/inward/record.url?scp=85161003775&partnerID=8YFLogxK
U2 - 10.1016/j.jmrt.2023.05.252
DO - 10.1016/j.jmrt.2023.05.252
M3 - Article
AN - SCOPUS:85161003775
SN - 2238-7854
VL - 25
SP - 581
EP - 592
JO - Journal of Materials Research and Technology
JF - Journal of Materials Research and Technology
ER -