Effect of building directions on the surface roughness, microstructure, and tribological properties of selective laser melted Inconel 625

Yan, Xingchen; Gao, Shuohong; Cheng, Ching-An; Huang, Jian; Khanlari, Khashayar; Dong, Dongdong; Ma, Wanbiao; Fenineche, N.; Liao, Hanlin; Liu, Min

doi:10.1016/j.jmatprotec.2020.116878

Cited by 60 publications

(16 citation statements)

References 28 publications

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“…However, the complexity of interaction and geometry of heat flow between the laser beam and the metallic powder bed results in a texturized microstructure leading to anisotropy that is not necessarily considered in the design of the built component. In addition, if the processing parameters are not chosen correctly, defects such as lack of fusion, keyholing and balling could be generated (Darvish et al , 2016; Li et al , 2019; Lin et al , 2019; Yan et al , 2021; AlFaify et al , 2019), diminishing the quality expected from a given alloy type. Therefore, producing parts by LPBF requires specialized manufacturing equipment and a controlled atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Microstructure simulation and experimental evaluation of the anisotropy of 316 L stainless steel manufactured by laser powder bed fusion

Barrionuevo

Ramos‐Grez²,

Walczak³

et al. 2022

RPJ

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Purpose The effect of processing parameters on the microstructure of steel produced by laser-based powder bed fusion (LPBF) is a recognized opportunity for property design through microstructure control. Because the LPBF generates a textured microstructure associated with high anisotropy, it is of interest to determine the fabrication plane that would generate the desired property distribution within a component. Design/methodology/approach The microstructure of 316 L produced by LPBF was characterized experimentally (optical, scanning electron microscopy, glow discharge emission spectrometry and X-ray diffraction), and a finite element method was used to study the microstructure features of grain diameter, grain orientation and thermal parameters of cooling rate, thermal gradient and molten pool dimensions. Findings The computational tool of Ansys Additive was found efficient in reproducing the experimental effect of varying laser power, scanning speed and hatch spacing on the microstructure. In particular, the conditions for obtaining maximum densification and minimum fusion defects were consistent with the experiment, and the features of higher microhardness near the component’s surface and distribution of surface roughness were also reproduced. Originality/value To the best of the author’s knowledge, this paper is believed to be the first systematic attempt to use Ansys Additive to investigate the anisotropy of the 316 L SS produced by LPBF.

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Section: Introductionmentioning

confidence: 99%

Microstructure simulation and experimental evaluation of the anisotropy of 316 L stainless steel manufactured by laser powder bed fusion

Barrionuevo

Ramos‐Grez²,

Walczak³

et al. 2022

RPJ

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“…The NiCrBSiC alloy is a well-known wear and corrosion resistant self-fluxing material, which is used as a coating with excellent mechanical properties [1][2][3]. This is a Ni-based alloy with precipitates of borides, carbides and silicon-containing phases of various sizes and shapes [4].…”

Section: Introductionmentioning

confidence: 99%

Microstructure of the deposited NiCrBSiC coating after laser polishing

Afanasieva

Pavlov

2022

Lett. Mater.

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The structure of the surface layers of NiCrBSiC coatings obtained by powder laser cladding and subsequent laser polishing with a multichannel CO 2 laser has been studied. XRD and TEM / STEM showed that the coatings are a γ-Ni matrix with Ni 3 B, Cr 3 C 2 and Ni 3 Si precipitates. It was shown that the matrix of the coating after laser cladding has a high density of dislocations, which form networks. XRD evidences a decrease in the number of the precipitates after laser polishing and TEM / STEM demonstrated a decrease in the density of dislocations and the appearance of nanostructured γ-Ni layers in the form of flat elongated plates. The width of nano-grains is ≈20 nm near the interface and increases with distance from it. Microhardness measurements showed an increase from 4.4 to 5 GPa after laser polishing.

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“…This L-PBF technique is also known as selective laser melting TM (SLM), where metal powder is selectively melted and solidified layer by layer. Several authors claim that SLM is the most successful and rapidly growing AM process, owing to the ability to manufacture end-use metal parts with complex inner and outer structures (Aboulkhair et al, 2014;Campanelli et al, 2014;Criales et al, 2016;GaoLe et al, 2020;Goossens et al, 2018;Kim et al, 2021;Kostevsek, 2018;Li et al, 2018c;Yan et al, 2021). Moreover, countless parameters are involved in the performance of the SLM technique, such as scan-related, laserrelated, powder-related and temperature-related (Aboulkhair et al, 2014;Li et al, 2021b) (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Selective laser melting: lessons from medical devices industry and other applications

Fé-Perdomo

Ramos‐Grez

Beruvides³

et al. 2021

RPJ

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Purpose The purpose of this paper is to outline some key aspects such as material systems used, phenomenological and statistical process modeling, techniques applied to monitor the process and optimization approaches reported. All these need to be taken into account for the ongoing development of the SLM technique, particularly in health care applications. The outcomes from this review allow not only to summarize the main features of the process but also to collect a considerable amount of investigation effort so far achieved by the researcher community. Design/methodology/approach This paper reviews four significant areas of the selective laser melting (SLM) process of metallic systems within the scope of medical devices as follows: established and novel materials used, process modeling, process tracking and quality evaluation, and finally, the attempts for optimizing some process features such as surface roughness, porosity and mechanical properties. All the consulted literature has been highly detailed and discussed to understand the current and existing research gaps. Findings With this review, there is a prevailing need for further investigation on copper alloys, particularly when conformal cooling, antibacterial and antiviral properties are sought after. Moreover, artificial intelligence techniques for modeling and optimizing the SLM process parameters are still at a poor application level in this field. Furthermore, plenty of research work needs to be done to improve the existent online monitoring techniques. Research limitations/implications This review is limited only to the materials, models, monitoring methods, and optimization approaches reported on the SLM process for metallic systems, particularly those found in the health care arena. Practical implications SLM is a widely used metal additive manufacturing process due to the possibility of elaborating complex and customized tridimensional parts or components. It is corroborated that SLM produces minimal amounts of waste and enables optimal designs that allow considerable environmental advantages and promotes sustainability. Social implications The key perspectives about the applications of novel materials in the field of medicine are proposed. Originality/value The investigations about SLM contain an increasing amount of knowledge, motivated by the growing interest of the scientific community in this relatively young manufacturing process. This study can be seen as a compilation of relevant researches and findings in the field of the metal printing process.

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Effect of building directions on the surface roughness, microstructure, and tribological properties of selective laser melted Inconel 625

Cited by 60 publications

References 28 publications

Microstructure simulation and experimental evaluation of the anisotropy of 316 L stainless steel manufactured by laser powder bed fusion

Microstructure simulation and experimental evaluation of the anisotropy of 316 L stainless steel manufactured by laser powder bed fusion

Microstructure of the deposited NiCrBSiC coating after laser polishing

Selective laser melting: lessons from medical devices industry and other applications

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