Effect of annealing on microstructures and mechanical properties of PA-12 lattice structures proceeded by multi jet fusion technology

被引:29
作者
Ali, Mubasher [1 ]
Sari, Resy Kumala [2 ]
Sajjad, Uzair [3 ]
Sultan, Muhammad [4 ]
Ali, Hafiz Muhammad [5 ,6 ]
机构
[1] Natl Taiwan Univ Sci & Technol, High Speed 3D Printing Res Ctr, Keelung Rd, Taipei 106, Taiwan
[2] Univ Pahlawan Tuanku Tambusai, Dept Ind Engn, Riau 28412, Indonesia
[3] Natl Yang Ming Chiao Tung Univ, Dept Mech Engn, 1001 Univ Rd, Hsinchu 300, Taiwan
[4] Bahauddin Zakariya Univ, Dept Agr Engn, Bosan Rd, Multan 60800, Pakistan
[5] King Fahd Univ Petr & Minerals, Mech Engn Dept, Dhahran 31261, Saudi Arabia
[6] King Fahd Univ Petr & Minerals, Interdisciplinary Res Ctr Renewable Energy & Powe, Dhahran 31261, Saudi Arabia
关键词
Annealing heat-treatment; Additive manufacturing; Energy absorption; Lattice structures; Electronic scanning micrograph; Structural behavior; HEAT-TREATMENT; CYLINDRICAL-SHELLS; PARTS; NANOFLUID; IMPACT;
D O I
10.1016/j.addma.2021.102285
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Polymer based additive manufacturing is a robust manufacturing paradigm and facilitates production of highly customized parts with substantially improved mechanical properties. Therefore, the aim of this research is to investigate seven polymeric lattice structures namely: Diamond, Gyroid, Kelvin, Split-P, SUP, Primitive, and Octet. The annealing heat-treatment was used at two different tempartures:110 degrees C and 130 degrees C for a constant time period (2 h). In total, five specimens were investigated for each sample (such as for each case of annealed and as built samples). The SEM images show greater smoothness of microstructure with application of heat treatment. However, a higher temperature can have an adverse effect. For example, the roughness of Gyroid, Octet, and SUP is decreased compared to the As-built sample. In addition, it is shown that surface roughness is directly proportional to the mechanical strength. Among all the structures, Diamond and SUP structures (As-built) demonstrate higher performance in terms of load-bearing capacity (at densification point) and lower flexibility compared to their counter-part. For instance, Diamond and Octet structures' strength is increased by 22% and 20% whereas flexibility is decreased by 12% and 8%, respectively. Maximum energy absorption is achieved by the Diamond structure followed by the Gyroid, Split-P, Kelvin, SUP, and Primitive. Apparently, the heat treatment has induced brittleness in the structure making it prone to cracks. A newly designed SUP structure has demonstrated the maximum strength among all the tested structures whereas the Octet structure exhibited the least strength. In return, this increase in the strength of the SUP structure is achieved at a cost of a decrease in flexibility.
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页数:14
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