TY - JOUR
T1 - High-stiffness and strength porous maraging steel via topology optimization and selective laser melting
AU - Takezawa, Akihiro
AU - Koizumi, Yuichiro
AU - Kobashi, Makoto
N1 - Funding Information:
This work was partially supported by “Knowledge Hub Aichi”, Priority Research Project from Aichi Prefectural Government and JSPS KAKENHI Grant number 15K12557 .
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - Recent additive manufacturing technologies can be used to fabricate porous metals with precise internal pore structures and effective performance. We use topology optimization to derive an optimal pore structure shape with high stiffness that is verified experimentally. The design maximizes the effective bulk modulus and isotropic stiffness, and the performance is compared with Hashin–Shtrikman (HS) bounds. The optimized structure is fabricated via selective laser melting of maraging steel, which is a high-strength, iron-nickel steel that cannot easily be made porous with conventional methods. The optimal porous structure achieved 85% of the performance of the HS upper bound in numerical simulations, and at least 90% of them were realized in compressive testing. Finally, the performance is discussed relative to that of other metals.
AB - Recent additive manufacturing technologies can be used to fabricate porous metals with precise internal pore structures and effective performance. We use topology optimization to derive an optimal pore structure shape with high stiffness that is verified experimentally. The design maximizes the effective bulk modulus and isotropic stiffness, and the performance is compared with Hashin–Shtrikman (HS) bounds. The optimized structure is fabricated via selective laser melting of maraging steel, which is a high-strength, iron-nickel steel that cannot easily be made porous with conventional methods. The optimal porous structure achieved 85% of the performance of the HS upper bound in numerical simulations, and at least 90% of them were realized in compressive testing. Finally, the performance is discussed relative to that of other metals.
KW - Additive manufacturing
KW - Hashin–Shtrikman bound
KW - Porous metal
KW - Selective laser melting
KW - Topology optimization
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U2 - 10.1016/j.addma.2017.10.004
DO - 10.1016/j.addma.2017.10.004
M3 - Article
AN - SCOPUS:85042718859
SN - 2214-8604
VL - 18
SP - 194
EP - 202
JO - Additive Manufacturing
JF - Additive Manufacturing
ER -