Effect of hatch spacing and laser power on microstructure, texture, and thermomechanical properties of laser powder bed fusion (L-PBF) additively manufactured NiTi

Saghaian, Sayed Ehsan; Nematollahi, Mohammadreza; Toker, Guher P.; Hinojos, Alejandro; Moghaddam, Narges Shayesteh; Saedi, Soheil; Lu, Charles Y.; Mahtabi, Mohammad J.; Mills, Michael J.; Elahinia, Mohammad; Karaca, H.E.

doi:10.1016/j.optlastec.2021.107680

Cited by 27 publications

(16 citation statements)

References 75 publications

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“…Saghaian et al (2022) printed samples of NiTi alloy with different hatch spacing, and the results showed that by increasing hatch spacing, the resulting microstructure changed from columnar to equiaxed. The developed G-R map also exhibited that increasing hatch spacing will decrease the G/R and hence the microstructure tends to be less columnar.…”

Section: Resultsmentioning

confidence: 99%

“…Shi et al (2020) showed that the samples fabricated with high layer thickness resulted in grain coarsening, which is also demonstrated by the developed G-R map in the present study. Saghaian et al (2022) printed samples of NiTi alloy with different hatch spacing, and the results showed that by increasing Different solidification characteristics affect the grain evolution and produce a crystallographic texture; as a result, the mechanical properties of the printed part also vary. The findings of the current study exhibited that the resulting microstructure of parts fabricated by LPBF can be tailored by varying the solidification characteristics through input LPBF process parameters.…”

Section: Solidification or G-r Mapmentioning

confidence: 99%

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Development of process-structure linkage for Inconel 718 processed by laser powder bed fusion: a numerical modeling approach

Kumar,

Shukla

2023

RPJ

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Purpose Understanding and tailoring the solidification characteristics and microstructure evolution in as-built parts fabricated by laser powder bed fusion (LPBF) is crucial as they influence the final properties. Experimental approaches to address this issue are time and capital-intensive. This study aims to develop an efficient numerical modeling approach to develop the process–structure (P-S) linkage for LPBF-processed Inconel 718. Design/methodology/approach In this study, a numerical approach based on the finite element method and cellular automata was used to model the multilayer, multitrack LPBF build for predicting the solidification characteristics (thermal gradient G and solidification rate R) and the average grain size. Validations from published experimental studies were also carried out to ensure the reliability of the proposed numerical approach. Furthermore, microstructure simulations were used to develop P-S linkage by evaluating the effects of key LPBF process parameters on G × R, G/R and average grain size. A solidification or G-R map was also developed to comprehend the P-S linkage. Findings It was concluded from the developed G-R map that low laser power and high scan speed will result in a finer microstructure due to an increase in G × R, but due to a decrease in G/R, columnar characteristics are also reduced. Moreover, increasing the layer thickness and decreasing the hatch spacing lowers the G × R, raises the G/R and generates a coarse columnar microstructure. Originality/value The proposed numerical modeling approach was used to parametrically investigate the effect of LPBF parameters on the resulting microstructure. A G-R map was also developed that enables the tailoring of the as-built LPBF microstructure through solidification characteristics by tuning the process parameters.

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Section: Resultsmentioning

confidence: 99%

Section: Solidification or G-r Mapmentioning

confidence: 99%

Development of process-structure linkage for Inconel 718 processed by laser powder bed fusion: a numerical modeling approach

Kumar,

Shukla

2023

RPJ

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“…This intricate process typically occurs within a preheated chamber under controlled temperature and atmosphere, often involving an inert gas depending on the specific material and processing parameters. Notably, variations in these parameters significantly influence the final product’s properties, encompassing its microstructure, mechanics, and even physicochemical characteristics [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ].…”

Section: Production Of Niti and Methods Of Additive Manufacturingmentioning

confidence: 99%

A Review on Additive Manufacturing Methods for NiTi Shape Memory Alloy Production

Kubášová,

Drátovská,

Losertová

et al. 2024

Materials

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The NiTi alloy, known as Nitinol, represents one of the most investigated smart alloys, exhibiting a shape memory effect and superelasticity. These, among many other remarkable attributes, enable its utilization in various applications, encompassing the automotive industry, aviation, space exploration, and, notably, medicine. Conventionally, Nitinol is predominantly produced in the form of wire or thin sheets that allow producing many required components. However, the manufacturing of complex shapes poses challenges due to the tenacity of the NiTi alloy, and different processing routes at elevated temperatures have to be applied. Overcoming this obstacle may be facilitated by additive manufacturing methods. This article provides an overview of the employment of additive manufacturing methods, allowing the preparation of the required shapes of Nitinol products while retaining their exceptional properties and potential applications.

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“…Saedi et al [10] indicated that when the energy density was up to 222.2 J/mm3, the AM fabricated samples showed excellent recoverable strains 5.5 % after the 10th cycle. Saghaian et al [11] found that the part's microstructure and associated thermo-mechanical properties showed a strong dependence on scanning spacing. The heat conduction and convection within the melt pool would be altered with the change of scanning spacing.…”

Section: Superelasticity and Strain Recovery Of Additively Manufactur...mentioning

confidence: 99%

A review on the superelasticity and tribological properties of NiTi shape memory alloys fabricated by additive manufacturing

Shi

et al. 2023

Fourth International Conference on Optoelectronic Science and Materials (ICOSM 2022)

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NiTi shape memory alloys (SMAs) were utilized in electronics, medicine and aerospace, etc. One difficult point is the solid-state phase transformation of NiTi alloy during machining operations. Additive manufacturing offers a promising solution to this dilemma, which proves a new way for complex structure NiTi alloy. In this paper, we briefly introduce the research progress and status of additive manufacture (AM)-fabricated NiTi alloy at home and abroad. The phase transformation behavior was analyzed by varying AM parameters. Afterward, the previously reported superelasticity of as-built NiTi alloys in compressive and tensile stress states was summarized. The final section summarizes the main findings of tribological properties of NiTi alloys and outlines the trend for future work.

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Effect of hatch spacing and laser power on microstructure, texture, and thermomechanical properties of laser powder bed fusion (L-PBF) additively manufactured NiTi

Cited by 27 publications

References 75 publications

Development of process-structure linkage for Inconel 718 processed by laser powder bed fusion: a numerical modeling approach

Development of process-structure linkage for Inconel 718 processed by laser powder bed fusion: a numerical modeling approach

A Review on Additive Manufacturing Methods for NiTi Shape Memory Alloy Production

A review on the superelasticity and tribological properties of NiTi shape memory alloys fabricated by additive manufacturing

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