High power laser powder bed fusion of Inconel 718 alloy: Effect of laser focus shift on formability, microstructure and mechanical properties

Zhong, Qiao; Wei, Kaiwen; Lu, Ziang; Yue, Xiaoze; Ouyang, Taoyuan; Zeng, Xiaoyan

doi:10.1016/j.jmatprotec.2022.117824

Cited by 17 publications

(2 citation statements)

References 23 publications

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“…This difference is well beyond the error bar of the determination and is above 15% of the actual stress value. Especially since in high-power PBF-LB (1000 W) strong cube-type textures (t ' 20) are realized (Zhong et al, 2023), texture-based methods should be employed in such a case. However, for texture indices J ODF < 3, the effect of texture on the RS values seems to rapidly decrease (Fig.…”

Section: Figure 11mentioning

confidence: 99%

Texture-based residual stress analysis of laser powder bed fused Inconel 718 parts

Schröder¹,

Evans²,

Luzin³

et al. 2023

J Appl Crystallogr

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Although layer-based additive manufacturing methods such as laser powder bed fusion (PBF-LB) offer an immense geometrical freedom in design, they are typically subject to a build-up of internal stress (i.e. thermal stress) during manufacturing. As a consequence, significant residual stress (RS) is retained in the final part as a footprint of these internal stresses. Furthermore, localized melting and solidification inherently induce columnar-type grain growth accompanied by crystallographic texture. Although diffraction-based methods are commonly used to determine the RS distribution in PBF-LB parts, such features pose metrological challenges in their application. In theory, preferred grain orientation invalidates the hypothesis of isotropic material behavior underlying the common methods to determine RS. In this work, more refined methods are employed to determine RS in PBF-LB/M/IN718 prisms, based on crystallographic texture data. In fact, the employment of direction-dependent elastic constants (i.e. stress factors) for the calculation of RS results in insignificant differences from conventional approaches based on the hypothesis of isotropic mechanical properties. It can be concluded that this result is directly linked to the fact that the {311} lattice planes typically used for RS analysis in nickel-based alloys have high multiplicity and less strong texture intensities compared with other lattice planes. It is also found that the length of the laser scan vectors determines the surface RS distribution in prisms prior to their removal from the baseplate. On removal from the baseplate the surface RS considerably relaxes and/or redistributes; a combination of the geometry and the scanning strategy dictates the sub-surface RS distribution.

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Section: Figure 11mentioning

confidence: 99%

Texture-based residual stress analysis of laser powder bed fused Inconel 718 parts

Schröder¹,

Evans²,

Luzin³

et al. 2023

J Appl Crystallogr

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“…(b) thermodynamic simulation of melt track X -Y, X -Z and Y -Z plane observations (modes with principal axis of elliptical beam parallel and perpendicular to scanning direction are denoted by LE and TE, respectively) [85,87] ; (c) SEM image at melt pool bottom of 316L alloy [85] ; (d) EBSD image of side of 316L alloy [86] 1002306 defocusing laser [88] ; (b) OM diagrams of IN718 alloy with defocus of 0, 5, 10, 15 and 20 mm, respectively [88] ; (c) OM diagram of AlSi10Mg alloy [91] ; (d) SEM and EBSD images of side of IN718 alloy [92] 1002306 -8…”

mentioning

confidence: 99%

多场调控金属激光增材制造研究现状与展望（特邀）

Gao Hairui,

Li Jikang,

Zhang Zhenwu

et al. 2024

中国激光

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Significance Laser additive manufacturing (LAM) technology uses a focused highenergy laser beam as the heat source to achieve integrated forming of complex metal components, avoiding the complex postprocessing steps of traditional processing techniques and achieving high forming efficiency, which makes it have broad application prospects in aerospace, automotive, medical and other fields. The metal additive manufacturing process based on laser and powder mainly includes two types: selective laser melting (SLM) and laser directed energy deposition (LDED). LAM has been widely used in the forming of various metal materials, including aluminum alloys, titanium alloys, copper alloys, nickelbased superalloys, magnesium alloys, steel, and so on.Due to the current widespread use of Gaussian laser in laser additive manufacturing technology, the peak intensity generated in the focusing area is very high. When laser interacts with metal powder, the widthtodepth ratio of the melt pool is small and there are large temperature gradient and cooling rate. The instability caused by complex melt flow dynamics and the accumulation of repeated heating and cooling cycles are prone to keyholes, splashing, spheroidization, residual stress, cracks, and anisotropic microstructures, which seriously affect the strength, toughness, and fatigue resistance of formed components in turn. Modifying the alloy composition 1002306 -23 特邀综述第 51 卷第 10 期/2024 年 5 月/中国激光 or adding strengthening phase particles can effectively eliminate the cracks and anisotropic columnar crystal structure in metal samples.

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High-Strain Rate and High-Temperature Properties of Additively Manufactured Nickel-Based Alloy 718

Sankar,

Mallaiah,

McCarthy

et al. 2024

The Minerals, Metals &Amp; Materials Series

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High power laser powder bed fusion of Inconel 718 alloy: Effect of laser focus shift on formability, microstructure and mechanical properties

Cited by 17 publications

References 23 publications

Texture-based residual stress analysis of laser powder bed fused Inconel 718 parts

Texture-based residual stress analysis of laser powder bed fused Inconel 718 parts

多场调控金属激光增材制造研究现状与展望（特邀）

High-Strain Rate and High-Temperature Properties of Additively Manufactured Nickel-Based Alloy 718

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