Stress and deformation evaluation of the subarea scanning effect in direct laser-deposited Ti-6Al-4V

Yan, Hui; Shen, Lida; Wang, Xiao; Tian, Zongjun; Xu, Guojian; Xie, Dexin; Liang, Huixin

doi:10.1007/s00170-018-1983-0

Cited by 25 publications

(13 citation statements)

References 22 publications

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“…Krzyzanowski et al [24] used numerical simulation methods to study the roles of temperature and thermal stress in laser cladding, and reduced the thermal stress of the cladding layer via preheating. Yan et al [25] studied the influences of the laser-scanning mode on the deformation and residual stress distribution of formed parts, and reduced the deformation by changing the scanning mode. Yan et al [26] carried out the on-site monitoring of the temperature under different process parameters via infrared cameras and thermocouples, and studied the effect of temperature on laser cladding deformation.…”

Section: Introductionmentioning

confidence: 99%

Study on the Deformation Control and Microstructures of Thin-Walled Parts Repaired by Laser Cladding

Huang

2020

Coatings

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To reduce the deformation and improve the quality of thin-walled parts repaired by laser cladding, a three-factor, three-level orthogonal experimental scheme was employed to clad Ni60 powder on thin-walled parts with a thickness of 3.5 mm. To measure the deformation of the thin-walled parts, a method of combining the meshing of the backs of the thin-walled parts and fixing one end of the parts during cladding was used. The effects of the powder feed rate, laser power, and scanning speed on the deformation of the thin-walled parts were studied via visual analysis and analysis of variance, and the process parameters that resulted in the minimum deformation were determined. The deformation process of the thin-walled parts and the causes of cladding stress were also studied, and the microstructure of the cladding layer with the minimum deformation was analyzed via scanning electron microscopy (SEM). The results reveal that the deformation of the thin-walled parts increased with the increase of laser power. The increases of the scanning speed and powder feed rate were found to reduce the deformation of thin-walled parts; the laser power was found to have a significant effect, and the powder feed rate was found to have no significant effect, on the deformation of thin-walled parts. The order of the influence of factors on the deformation of thin-walled parts from greatest to least was determined to be as follows: laser power > scanning speed > powder feed rate. The optimal parameters to obtain the minimum deformation and good metallurgical bonding of thin-walled parts were found to be a powder feed rate of 1.4 r/min, a laser power of 1100 W, and a scanning speed of 8 mm/s. From the bottom to the top, the crystal structure of the coating with the minimum deformation was found to be coarse dendrite, dendritic crystal, and equiaxed crystal.

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Section: Introductionmentioning

confidence: 99%

Study on the Deformation Control and Microstructures of Thin-Walled Parts Repaired by Laser Cladding

Huang

2020

Coatings

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“…He found that the pattern has a significant effect on the distortion of the laser melted part. Yan found that island strategy can effectively decrease the maximum distortion in TC4 laser additive manufacturing [18]. Cao [19] has found that the preheating effectively mitigates the final distortion and the residual stress in EBM Ti-6Al-4V.…”

Section: Introductionmentioning

confidence: 99%

Assumption of Constraining Force to Explain Distortion in Laser Additive Manufacturing

et al. 2018

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Distortion is a common but unrevealed problem in metal additive manufacturing, due to the rapid melting in metallurgy and the intricate thermal-mechanical processes involved. We explain the distortion mechanism and major influencing factors by assumption of constraining force, which is assumed between the added layer and substrate. The constraining force was set to act on the substrate in a static structural finite element analysis (FEA) model. The results were compared with those of a thermal-mechanical FEA model and experiments. The constraining force and the associated static structural FEA showed trends in distortion and stress distribution similar to those shown by thermal-mechanical FEA and experiments. It can be concluded that the constraining force acting on the substrate is a major contributory factor towards the distortion mechanism. The constraining force seems to be primarily related to the material properties, temperature, and cross-sectional area of the added layer.

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“…This result clearly revealed that it is impossible to fabricate a precision injection mold with microstructures only by the use of AM. A distinct advantage of a precision injection mold fabricated by the proposed method is no residual thermal stress inside the mold compared to that fabricated by DMLS [30].…”

Section: Resultsmentioning

confidence: 99%

A Cost-Effective Method for Rapid Manufacturing a Precision Mold With Microstructures Using Hybrid Manufacturing Technologies

Kuo¹,

Lin²,

Luo³

2021

Preprint

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Injection molding is a cost-effective to manufacture molded products by injection molding machine. A precision part with microstructures can be fabricated effectively through a precision mold. In this study, a cost-effective method for rapid manufacturing a precision component and a precision injection mold with microstructures by integrating additive manufacturing, rapid tooling, and computer numerical control milling. It was found that of the dimensional accuracy of a precision component in the length, width, and height can be controlled at approximately 30 µm. Injection molding was performed using an injection mold with microstructures with a microstructure of 950 µm and the dimensional accuracy of a molded part in the length, width, and microstructure can be controlled at approximately 60 µm, 50 µm, and 10 µm, respectively. The remarkable findings of this study can be used for the fabrication of molds or dies efficiently and economically for trial production in the mold industry since the quality of the precision component and the precision mold can meet the standards of the general industry.

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Stress and deformation evaluation of the subarea scanning effect in direct laser-deposited Ti-6Al-4V

Cited by 25 publications

References 22 publications

Study on the Deformation Control and Microstructures of Thin-Walled Parts Repaired by Laser Cladding

Study on the Deformation Control and Microstructures of Thin-Walled Parts Repaired by Laser Cladding

Assumption of Constraining Force to Explain Distortion in Laser Additive Manufacturing

A Cost-Effective Method for Rapid Manufacturing a Precision Mold With Microstructures Using Hybrid Manufacturing Technologies

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