Effect of supporting structure design on residual stresses in selective laser melting of AlSi10Mg

Jiang, Xiaohui; Yu, Chunbo; Guo, Honglan; Gao, Shan; Zhang, Yong

doi:10.1007/s00170-021-08010-5

Cited by 17 publications

(5 citation statements)

References 37 publications

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“…Metals 2024, 14, x FOR PEER REVIEW 9 of 18 agreed by Xiaohui et al [26], the extreme temperature gradient does have a substantial consequence on structural integrity and the proper functioning of the constructed components; therefore, it is vital to work on the microstructure, residual stress, and mechanical characteristics of the material. The expelled silicon is not agglomerated, as was observed in the stress-relieved samples, but is scattered on the surface of the aluminium matrix, which could be the cause of the difference in hardness.…”

Section: Optical Microscope (Om) and Scanning Electron Microscope (Se...mentioning

confidence: 99%

Optimisation of the Heat Treatment Profile for Powder-Bed Fusion Built AlSi10Mg by Age Hardening and Ice-Water Quenching

Mfusi,

Popoola,

Mathe

2024

Metals

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During powder-bed fusion (PBF), the irradiated material causes undesirable thermal stresses while experiencing large temperature oscillations over a rapid period. This requires the components produced by this technique to undergo thermal treatment. The characteristics of additively manufactured materials, which are rapid heating and cooling, do not accept conventional methods, such as thermal treatment, that alleviate stress for the removal of thermal stresses. In this research, the thermal treatment of age hardening is explored, in which AlSi10Mg is subjected to lower temperatures for longer periods of time. Other samples were thermally treated at 300 °C and 400 °C for various hours and quenched in ice water. This is conducted to identify the acceptable temperature and conditions that will improve the properties after thermal treatment without jeopardising other properties of the material and to investigate the effects of the thermal treatment profiles on the microstructural and mechanical characteristics of the AlSi10Mg samples.

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Section: Optical Microscope (Om) and Scanning Electron Microscope (Se...mentioning

confidence: 99%

Optimisation of the Heat Treatment Profile for Powder-Bed Fusion Built AlSi10Mg by Age Hardening and Ice-Water Quenching

Mfusi,

Popoola,

Mathe

2024

Metals

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“…Metal additive manufacturing (AM) [10,11] techniques can create LSR injection molds with CHC and CCC. However, there are many distinct processing defects, including cracking [12], warpage [13], and residual stress [14]. Additionally, little has been reported on the injection mold with CCC and CHC simultaneously hitherto.…”

Section: Introductionmentioning

confidence: 99%

Development of an Injection Mold with High Energy Efficiency of Vulcanization for Liquid Silicone Rubber Injection Molding of the Fisheye Optical Lens

Kuo

Tasi

Hunag³

et al. 2023

Polymers

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Liquid silicone rubber (LSR) techniques are experiencing exponential growth, particularly in the field of high technology due to the low-temperature flexibility, superior heat stability, chemical resistance, and aging resistance of LSR components. Enhancing the curing rate of LSR parts in liquid silicone rubber injection molding is an important research topic. In this study, an injection mold with high energy efficiency of vulcanization for the liquid silicone rubber injection molding of a fisheye lens was developed and implemented. The LSR injection mold has a conformal heating channel (CHC) and conformal cooling channel (CCC) simultaneously. The function of CHC is to enhance the curing rate of a fisheye lens in the LSR injection molding to meet the requirements of sustainable manufacturing. The curing rates of a fisheye lens were numerically examined using the Moldex3D molding simulation software. It was found that the curing rate of the fisheye optical lens cured by injection mold with CHC was better than that of the injection mold with a conventional heating channel. The curing efficiency could be increased by about 19.12% when the heating oil temperature of 180 °C was used to cure the fisheye optical lens. The simulation results showed that the equation y = −0.0026x3 + 1.3483x2 − 232.11x + 13,770 was the most suitable equation for predicting the curing time (y) through the heating oil temperature (x). It was found that the trend of the experimental results was consistent with the simulation results. In addition, the equation y = −0.0656x2 + 1.5827x − 0.894 with the correlation coefficient of 0.9974 was the most suitable equation for predicting the volumetric shrinkage of the fisheye optical lens (y) through the heating oil temperature (x). The volume shrinkage of the fisheye optical lens cured by injection mold with CHC was very similar to that of the injection mold with a conventional heating channel. The maximum volume shrinkage of the fisheye optical lens cured at 180 °C was about 8.5%.

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“…Gyung [21] found that preheating the substrate could improve the cooling rate during the SLM forming process of CoCrMo alloy, which inhibited the transformation from FCC α-Co phase to martensitic ε-Co phase, resulting in reduced residual stress and improved mechanical properties. Jiang [22] designed a supporting structure for forming SLM components with different structural characteristics to reduce the residual stress in the overhanging structure of the components. The result showed that the forming effect is relatively good when the contact area of single supporting tooth structure and component overhanging structure is 0.25 mm 2 and the X/Y interval of main supporting structure is 2.5 mm.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation into Residual Stress Control of 24CrNiMo Alloy Steel by Selective Laser Melting

et al. 2023

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Residual stresses are a major problem in SLM forming of large-sized parts of high-performance materials. The purpose of this study is to investigate the effects of scanning strategy, preheating temperature, and heat treatment on residual stresses in SLM formed high-strength steels. An experimental method was used to investigate the residual stresses in SLM forming of high-strength steels. The peak and distribution of residual stresses can be changed by optimizing the scanning strategy. The most suitable scanning method is the strip rotation scanning strategy. The optimum substrate preheating temperature is 200 °C, and the residual stress of SLM forming can be significantly reduced by 62.5%. The annealing temperature has a clear effect on the residual stress release, and also has an impact on the microstructure and mechanical properties. After annealing treatment at 550 °C for 3 h, the residual stresses can be effectively released, while the uniformity of microstructure and mechanical properties is improved. Finally, the control strategy of residual stress, microstructure and mechanical properties of 24CrNiMo high-strength steel was obtained.

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Effect of supporting structure design on residual stresses in selective laser melting of AlSi10Mg

Cited by 17 publications

References 37 publications

Optimisation of the Heat Treatment Profile for Powder-Bed Fusion Built AlSi10Mg by Age Hardening and Ice-Water Quenching

Optimisation of the Heat Treatment Profile for Powder-Bed Fusion Built AlSi10Mg by Age Hardening and Ice-Water Quenching

Development of an Injection Mold with High Energy Efficiency of Vulcanization for Liquid Silicone Rubber Injection Molding of the Fisheye Optical Lens

An Experimental Investigation into Residual Stress Control of 24CrNiMo Alloy Steel by Selective Laser Melting

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