Microstructural control in metal laser powder bed fusion additive manufacturing using laser beam shaping strategy

Shi, Rongpei; Khairallah, Saad A.; Roehling, Tien T.; Heo, Tae Wook; McKeown, Joseph T.; Matthews, Manyalibo J.

doi:10.1016/j.actamat.2019.11.053

Cited by 253 publications

(98 citation statements)

References 30 publications

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“…The CP-Ti with optimized composite lattice structures were manufactured by SLM 125HL machine (SLM Solutions GmbH, Lübeck, Germany) under an argon gas atmosphere with O 2 content ＜0.05 wt% to reduce oxidation. The process begins with the preparation of CAD files which are subsequently sliced into two-dimensional layers by Materialise Magics [ 40 , 41 ]. The detailed process parameters are as follows based on our previous study [ 34 ]: the layer thickness is 30 μm; the scanning speed is 900 mm/s; the laser power is 200 W; the hatching space is 0.14 mm; and the hatching type is a continuous laser mode, which is alternated 33° between each layer.…”

Section: Methodsmentioning

confidence: 99%

Design and performance evaluation of additively manufactured composite lattice structures of commercially pure Ti (CP–Ti)

et al. 2021

Bioactive Materials

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Ti alloys with lattice structures are garnering more and more attention in the field of bone repair or regeneration due to their superior structural, mechanical, and biological properties. In this study, six types of composite lattice structures with different strut radius that consist of simple cubic (structure A), body-centered cubic (structure B), and edge-centered cubic (structure C) unit cells are designed. The designed structures are firstly simulated and analysed by the finite element (FE) method. Commercially pure Ti (CP–Ti) lattice structures with optimized unit cells and strut radius are then fabricated by selective laser melting (SLM), and the dimensions, microtopography, and mechanical properties are characterised. The results show that among the six types of composite lattice structures, combined BA, CA, and CB structures exhibit smaller maximum von-Mises stress, indicating that these structures have higher strength. Based on the fitting curves of stress/specific surface area versus strut radius, the optimized strut radius of BA, CA, and CB structures is 0.28, 0.23, and 0.30 mm respectively. Their corresponding compressive yield strength and compressive modulus are 42.28, 30.11, and 176.96 MPa, and 4.13, 2.16, and 7.84 GPa, respectively. The CP-Ti with CB unit structure presents a similar strength and compressive modulus to the cortical bone, which makes it a potential candidate for subchondral bone restorations.

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Section: Methodsmentioning

confidence: 99%

Design and performance evaluation of additively manufactured composite lattice structures of commercially pure Ti (CP–Ti)

et al. 2021

Bioactive Materials

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“…目前, CA法已广泛应用于金属增材制造中材料凝固组织演图13 (网络版彩图)选区激光熔融过程IN718合金一次枝晶间距对比 [77] . (a) 实验结果; (b) 预测结果(图片来自文献, 已取得授权) 化过程模拟 [37,49,[81][82][83] .…”

Section: Ca方法是应用较为广泛的材料微观组织介观尺unclassified

“…其中, 黄色箭头所示的β晶粒, 灰色箭头所示的中心晶粒和边缘处的细等轴晶都是横截面上微观组织形貌的典型特征(图片来自文献, 已取得授权) 图17 (网络版彩图) SEBM工艺Ti-6Al-4V合金熔池内微观组织演化过程按时间递增的计算结果. (a) 0.3492, (b) 1.1342, (c) 1.4291, (d) 1.8427 ms [37] (图片来自文献, 已取得授权) 此外, Shi等人 [83] 采用三维CA法研究了316L不锈钢选区激光熔融过程中材料微观组织的演化过程, 并详细对比分析了域内形核和外延式生长之间的竞争关系, 以及不同类型激光光源对微观组织的影响; Panwi-sawas等人 [85] 采用三维CA法模拟了激光增材制造过程中Ti-6Al-4V合金的微观组织初始相; Dezfoli等人除了上述的CA法, Zhu等人 [86] 进一步考虑了溶质 , 扫描速度变化范围为200-400 mm/min [49] (图片来自文献, 已取得授权) 图19 (网络版彩图)单道多层IN718合金的微观组织数值模拟结果 [49] . 再分布和固液界面曲率过冷度, 建立了一种改进的CA 法, 可模拟微观尺度的枝晶形貌.…”

Section: 拟问题的二次枝晶间距因此针对金属增材制造过程unclassified

Numerical simulation on metallic additive manufacturing

Chen

Xiong

Huang

et al. 2020

Sci. Sin.-Phys. Mech. Astron.

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“…4,5) Shi investigated CET for austenitic stainless steel by simulating control of the temperature gradient (G) and S/L interface growth rate (R). 6) CET proceeded preferentially when R was increased and G was decreased.…”

Section: Introductionmentioning

confidence: 98%

Control of Solidification Structure of Stainless Steel in Additive Manufacturing Process

et al. 2020

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Additive metal manufacturing-has been attracting attention for various applications such as aircraft parts. However, the parts manufactured exhibit anisotropy characteristics due to the columnar crystal structure induced by rapid melting and solidification. In this work, an equiaxed solidification structure is obtained by adding Zr to promote nucleation. Samples were fabricated by additive manufacturing using Zr-added SUS304L powder. Their microstructures were observed by scanning electron microscopy and transmission electron microscopy. The mechanical and corrosion resistance properties were evaluated by comparison with samples fabricated by additive manufacturing using SUS316L. The microstructure observation revealed that the formation of columnar crystals in the SUS304L-Zr-3DP samples was suppressed compared with the SUS316L-3DP samples and that the average grain size was reduced to 1/3 or less. The transmission electron microscopy revealed a ZrN crystallized substance, which may have contributed to the suppression of columnar crystal formation. Tensile test results showed that the SUS304L-Zr-3DP exhibited isotropic mechanical properties. Corrosion resistance tests using electrochemical methods showed that they exhibited higher corrosion resistance than the SUS316L-3DP. These results demonstrate that the solidification structure formed during additive manufacturing can be controlled by adding Zr into the alloy matrix as nucleation sites.

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Microstructural control in metal laser powder bed fusion additive manufacturing using laser beam shaping strategy

Cited by 253 publications

References 30 publications

Design and performance evaluation of additively manufactured composite lattice structures of commercially pure Ti (CP–Ti)

Design and performance evaluation of additively manufactured composite lattice structures of commercially pure Ti (CP–Ti)

Numerical simulation on metallic additive manufacturing

Control of Solidification Structure of Stainless Steel in Additive Manufacturing Process

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