Ultrasonic evaluation of elastic properties in laser powder bed fusion manufactured AlSi10Mg components

Czink, Steffen; Dietrich, Stefan; Schulze, Volker

doi:10.1016/j.ndteint.2022.102729

Cited by 10 publications

(11 citation statements)

References 23 publications

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“…Currently, process monitoring is mainly focused on detecting individual defects and process characteristics [12,13]. Common approaches include optical [14], acoustic [15], X-ray [16], pyrometric [17], and spectroscopical [18] techniques.…”

Section: Introductionmentioning

confidence: 99%

Absorbance measurement for in situ process regime identification in laser processing

Wittemer

Grünewald

Wudy

2023

Int J Adv Manuf Technol

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Laser melting can be conducted in two different process regimes, the conduction and the keyhole mode, which exhibit significantly different characteristics, dynamics, and stability and are highly sensitive to a magnitude of process parameters. Despite these differences and the resulting high relevance of the prevailing process regime for process development, the regime is commonly deduced after specimen testing. An identification of the regime parallel to the process could speed up the process development of, for example, laser beam welding or laser-based powder bed fusion of metals. Therefore, the possibility of an in situ regime identification under process-near conditions is the aim of these investigations. For this, the absorbance is measured in situ by using an integrating sphere on an in-house-developed test rig. This test rig can mimic real production process conditions to detect the characteristic change in the degree of absorption when switching between the process regimes. These measurements were conducted during experiments in which only the laser power was varied. A significant change in absorption was detected at a threshold laser power of 100 W, which correlates with the transition between the process regimes’ conduction and keyhole regime. This threshold was proven by subsequent identification analysis of micrographic cross sections. This correlation promises the possibility of fast in situ process regime identification under near-real production process conditions with the potential of accelerating process development.

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Section: Introductionmentioning

confidence: 99%

Absorbance measurement for in situ process regime identification in laser processing

Wittemer

Grünewald

Wudy

2023

Int J Adv Manuf Technol

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“…It is commonly used in the aerospace, medical, and automotive industries, to produce prototypes, tooling, and end-use parts. LPBF technology can use a variety of metallic powders, including titanium, aluminium, nickel alloys, and stainless steel [1].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Manufacturing Parameters of Additively Manufactured 316l Steel Samples Using Ultrasound Fingerprinting

Zia¹,

Carlson²,

Åkerfeldt³

2023

Preprint

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“…Afterwards, the hatching of the inner areas (hatching area) takes place. Therefore, an increase in keyhole-porosity can be found in the interface between the contour and hatching area leading to an inhomogeneous distribution of pores in PBF-LB components [23,24]. During a cyclic load, pores can lead to crack initiation and have therefore a major impact on the fatigue performance of a component [25].…”

Section: Introductionmentioning

confidence: 99%

“…During a cyclic load, pores can lead to crack initiation and have therefore a major impact on the fatigue performance of a component [25]. However, porosity also has an influence on the material's strength and stiffness, which was investigated in a previous study [24].…”

Section: Introductionmentioning

confidence: 99%

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Process-Specific Topology Optimization Method Based on Laser-Based Additive Manufacturing of AlSi10Mg Components: Material Characterization and Evaluation

Czink

Holoch²,

Renz³

et al. 2023

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In the laser powder bed fusion process (PBF-LB), components are built up incrementally by locally melting metal powder with a laser beam. This process leads to inhomogeneous material properties of the manufactured components. By integrating these specific material properties into a topology optimization algorithm, product developers can be supported in the early phases of the product development process, such as design finding. For this purpose, a topology optimization method was developed, which takes the inhomogeneous material properties of components fabricated in the PBF-LB process into account. The complex pore architecture in PBF-LB components was studied with micro-computed tomography (µCT). Thereby, three characteristic regions of different porosity were identified and analyzed. The effective stiffness in each of these regions was determined by means of resonant ultrasonic spectroscopy (RUS) as well as finite element analysis. Afterward, the effective stiffness is iteratively considered in the developed topology optimization method. The resulting design proposals of two optimization cases were analyzed and compared to design proposals derived from a standard topology optimization. To evaluate the developed topology optimization method, the derived design proposals were additionally manufactured in the PBF-LB process, and the characteristic pore architecture was analyzed by means of µCT.

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Ultrasonic evaluation of elastic properties in laser powder bed fusion manufactured AlSi10Mg components

Cited by 10 publications

References 23 publications

Absorbance measurement for in situ process regime identification in laser processing

Absorbance measurement for in situ process regime identification in laser processing

Prediction of Manufacturing Parameters of Additively Manufactured 316l Steel Samples Using Ultrasound Fingerprinting

Process-Specific Topology Optimization Method Based on Laser-Based Additive Manufacturing of AlSi10Mg Components: Material Characterization and Evaluation

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