Effect of Shielding Gas Volume Flow on the Consistency of Microstructure and Tensile Properties of 316L Manufactured by Selective Laser Melting

Ding, Ruochen; Ye, Jun; Du, B. X.; Li, Kailun; Li, Tao; Zhao, Lu; Guo, Yumeng

doi:10.3390/met11020205

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…4). Some occasionally circular shaped pores are still perceptible, which may have originated by gas entrapping during the processing [30]. These results allowed us to conclude that the applied laser energy density was enough to melt the IN718 material, without lack of fusion.…”

Section: Morphological Characterizationmentioning

confidence: 69%

Inconel 718–copper parts fabricated by 3D multi-material laser powder bed fusion: a novel technological and designing approach for rocket engine

Marques

Cunha

Gasik

et al. 2022

Int J Adv Manuf Technol

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A home-made 3D Multi-Material Laser Powder Bed Fusion (3DMMLPBF) system was used to produce novel multimaterial Inconel 718 (IN718) -Copper (Cu) parts with potential to be applied in rocket engines. This innovative approach combines IN718 high strength and Cu high thermal conductivity in a single part, fabricated at once.The main goal of this study was to validate the developed multi-material powder-based manufacturing technology as well to access both individual material zones and interface transition zone features in terms of metallurgical bonding and mechanical behavior. The multi-material IN718 -Cu specimens revealed a strong metallurgical bonding with a thin gradual chemical transition between two materials. Moreover, no significant pores, cracks or other defects were observed on both individual and interface zones as well no undesirable powders from the previous layers. IN718 hardness results were in agreement with literature (about 344 HV) and the results obtained for Cu (about 126 HV). The disparity on the hardness results between the IN718 and Cu is coherent with the thin diffusion zone reflected in the chemical compositional analysis. This multi-material material IN718 -Cu solution seems to be a promising approach since the two materials have a well-defined interface with no substantial defects, this, both IN718 and Cu are capable to maintain its most important individual properties, high strength and high thermal conductivity, respectively.

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Section: Morphological Characterizationmentioning

confidence: 69%

Inconel 718–copper parts fabricated by 3D multi-material laser powder bed fusion: a novel technological and designing approach for rocket engine

Marques

Cunha

Gasik

et al. 2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…Moreover, under the influence of heat input, the metal of the welded seam would be in a high-temperature state for a long time, and the quantity of heat transferred under the action of the temperature also increased. This could promote the migration of the grain boundary [33]. The grain size in the weld fusion zone in #10 was obviously coarser and larger than that of the #5, as shown in Figure 5i,j.…”

Section: Results Of Metallographic Testsmentioning

confidence: 94%

Effects of Flowrate of Additional Shielding Gas on the Properties of Welded Seam Using Twin-Wire GMAW Welding for Duplex Stainless Steel

Xue

2023

Metals

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Aiming to diminish the defects caused by high-speed pulsed GMAW (Gas Metal Arc Welding), such as lack of penetration, lack of fusion, humping and undercut, this paper proposes an improved twin-wire GMAW welding process by introducing the impact of additional shielding gas on the molten pool, and the effects of different shielding gas flowrates on the mechanical properties and microstructure of the welded seams were investigated. The purpose of introducing additional shielding gas was to use the airflow hood formed by gas injection to isolate air. The impact force generated by the jet might change the original natural solidification mode of the molten pool, which had the effect of improving weld formation and stirring the pool. The airflow hood formed during the process of the additional shielding gas jet impact welding of the molten pool might extend the protection time for the surface of the welding molten pool. The 2205 duplex stainless steel plate was used as the base material for the butt welding test, and the welded seams were subjected to a tensile test, hardness analysis, and metallographic analysis. The results indicated that as the flowrate of additional shielding gas increased in the range of 8 L/min~16 L/min, the width of the welded seam increased and the height of reinforcement decreased gradually. However, a weld seam with a lower middle region and higher sides would appear when the gas flowrate became excessively large. Under the identical welding current and for welding speeds of 160 cm/min, 180 cm/min and 200 cm/min, respectively, the joint formed under the flowrate of 12 L/min had the highest tensile strength (824.3 MPa) among the test specimens under different flowrates of 8 L/min, 12 L/min and 16 L/min. The test results indicated that the jet impact force was relatively moderate when the flowrate of the additional shielding gas was 12 L/min, and thus was optimal for the welded seam.

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“…The reason was that when the welding line energy increased, the corresponding weld cooling rate reduced and the secondary dendrite spacing obviously increased, which easily formed a coarser structure. Moreover, under the influence of line energy, the metal of the welded seam will be in a high-temperature state for a long time and the quantity of heat transferred under the action of the temperature difference also increases, which promoted the migration of the grain boundary [30].…”

Section: Results Of Metallographic Testsmentioning

confidence: 99%

Effects of Flowrate of Additional Shielding Gas on the Properties of Welded Seam by Twin-wire GMAW Welding for Duplex Stainless Steel

Yu¹,

Xue²

2023

Preprint

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Aiming to diminish the defects caused by high-speed pulsed GMAW welding, such as non-penetration, non-fusion, humping and undercut, the paper proposed an improved twin-wire double-pulsed high-speed welding process by introducing the impact of additional shielding gas on the welding pool and the effects of different shielding gas flowrates on the microstructure and mechanical properties of the welded seam was investigated. The 2205 duplex stainless steel plate was used as the base material for the butt welding test, and the welded seams were subjected to tensile test, metallographic analysis, hardness analysis, and nondestructive testing. The results indicate that as the flowrate of additional shielding gas increases in the range of 8 L/min~16 L/min, the width of the welded seam increases and the height of reinforcement decreases gradually. However, a grooved seam with a lower middle region and higher sides will appear when the gas flowrate becomes excessively large. The test results indicate that the jet impact force is relatively moderate when the flowrate of the additional shielding gas is 12 L/min and thus, is optimal for the welded seam.

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Effect of Shielding Gas Volume Flow on the Consistency of Microstructure and Tensile Properties of 316L Manufactured by Selective Laser Melting

Cited by 11 publications

References 14 publications

Inconel 718–copper parts fabricated by 3D multi-material laser powder bed fusion: a novel technological and designing approach for rocket engine

Inconel 718–copper parts fabricated by 3D multi-material laser powder bed fusion: a novel technological and designing approach for rocket engine

Effects of Flowrate of Additional Shielding Gas on the Properties of Welded Seam Using Twin-Wire GMAW Welding for Duplex Stainless Steel

Effects of Flowrate of Additional Shielding Gas on the Properties of Welded Seam by Twin-wire GMAW Welding for Duplex Stainless Steel

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