Crystallographic Orientation Control of 316L Austenitic Stainless Steel via Selective Laser Melting

Ishimoto, Takuya; Wu, Siqi; Ito, Yukinobu; Sun, Shang; Amano, Hiroki; Nakano, Takayoshi

doi:10.2355/isijinternational.isijint-2019-744

Cited by 74 publications

(36 citation statements)

References 32 publications

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“…In [23], it was shown that the L-PBF sample of 316L steel prepared with a laser scan perpendicular to the gas flow direction had a weak {110}<001> Goss texture. By varying the operating modes of the 3D laser printer, it was shown that two types of texture <110> or <100>, as well as textureless samples (random orientation) could be obtained in the L-PBF 316L steel sample [19,24,25].…”

Section: Analysis Of the Structure And Mechanical Properties Of The D...mentioning

confidence: 99%

Micromechanisms of Deformation and Fracture in Porous L-PBF 316L Stainless Steel at Different Strain Rates

Казанцева

Krakhmalev

Åsberg

et al. 2021

Metals

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The process of an unstable plastic flow associated with the strain rate sensitivity of mechanical properties was studied in porous 316L austenitic steel samples manufactured by laser powder bed fusion (L-PBF). Different micromechanisms of deformation and fracture of porous samples dependent on strain rate were found. It was found that despite the porosity, the specimens showed high strength, which increased with the loading rate. Porosity led to lower ductility of the studied specimens, in comparison with literature data for low porous 316L L-PBF samples and resulted in de-localization of plastic deformation. With an increase in strain rate, nucleation of new pores was less pronounced, so that at the highest strain rate of 8 × 10−3 s−1, only pore coalescence was observed as the dominating microscopic mechanism of ductile fracture.

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Section: Analysis Of the Structure And Mechanical Properties Of The D...mentioning

confidence: 99%

Micromechanisms of Deformation and Fracture in Porous L-PBF 316L Stainless Steel at Different Strain Rates

Казанцева

Krakhmalev

Åsberg

et al. 2021

Metals

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“…When the curvature radius at the melt pool bottom is small, even if grains oriented in the Z direction grow there, they are eliminated by the grains grew from the melt pool sides with ©110ª//Z orientation. 4,20) Such grains are also observed in the actual product as shown in the upper row of Fig. 8.…”

Section: Crystallographic Orientation Distributionmentioning

confidence: 60%

Modified Cellular Automaton Simulation of Metal Additive Manufacturing

2021

Self Cite

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Metal additive manufacturing (AM) technologies are attracting attentions not only as a fabrication process of complicated threedimensional parts but also as microstructure controlling processes. In powder bed fusion (PBF)-type AM, crystallographic texture can be controlled by scanning strategies of energy beam. To optimize microstructures, computer simulations for predicting microstructures play very important roles. In this work, we have developed simulation programs to explain the mechanism of the crystal orientation control. First, we simulated the shape of melt pool by analyzing the heat transfer using apparent heat conductivity when the penetration of laser beam through keyholes was taken into consideration because of the evaporation and accompanying convections. It was assumed that the primary crystal growth direction can be determined by the temperature gradient, and the crystals grow keeping the growth direction as generally recognized. The shapes of simulated melt pools agree well with experimental observations. The modified cellular automaton simulations successfully reproduced two typical textures with different preferential orientations along the building directions of ©100ª and ©110ª when the bidirectional scanning with and without a rotation of 90°, respectively, was accomplished between the layers.

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“…In recent years, more and more attention has been attracted on additive manufacturing (AM) technology due to its solid freeform fabrication, material saving, time saving and so on. [1][2][3][4][5] Selective laser melting (SLM), which is one of additive manufacturing technology, has got notice from a series of industries like military field, automotive field and aerospace field as it can achieve the formation of the metal part. [6][7][8][9][10] What's more, as the layer by layer forming from the bottom of the manufactured part, this method makes it possible to manufacture any complex structure part in theory.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Laser Power and Scan Speed in SLM

Han¹,

Duan

Mao

et al. 2022

ISIJ Int.

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With the rapid development of selective laser melting technology, the effect of different process parameters on the quality of the printed parts was studied by many researchers in recent years. In this work, a comparison on the effect of laser power and scan speed which was considered as two main factors to affect laser power density, was studied. An inner structure part with overhanging surface was designed and printed to better study the influence on the surface quality caused by these two factors. The testing results revealed that with the same energy density, different performance can be observed on the overhanging and side surface quality caused by laser power and scan speed. With the increasing of the laser power, side surface roughness value showed an increasing trend due to the increasing of the temperature gradient of the molten pool while the overhanging surface quality had a descending trend. It was mainly due to the fact that to keep the same laser power density, the scan speed decreased which resulted to the increasing time for solidification of the molten pool. This phenomenon lead to the increasing of the sinking distance and the overhanging surface quality showed a decline trend. KEY WORDS: selective laser melting (SLM); inner structure part; laser power; scan speed; inner surface quality.

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Crystallographic Orientation Control of 316L Austenitic Stainless Steel via Selective Laser Melting

Cited by 74 publications

References 32 publications

Micromechanisms of Deformation and Fracture in Porous L-PBF 316L Stainless Steel at Different Strain Rates

Micromechanisms of Deformation and Fracture in Porous L-PBF 316L Stainless Steel at Different Strain Rates

Modified Cellular Automaton Simulation of Metal Additive Manufacturing

Comparison of Laser Power and Scan Speed in SLM

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