Grain structure and texture of the SLM single track

Yu, Chunhui; Xing, Leilei; Li, Kailun; Chen, Jinhan; Liu, Wei; Ma, Jing; Shen, Zhijian

doi:10.1016/j.jmatprotec.2020.116591

Cited by 51 publications

(16 citation statements)

References 22 publications

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“…4b), as reported by D. Kong et al (Ref 26). Finally, the characterization of this cellular structure can be done considering the G/R ratio and the product of G and R: the morphology and the size of solidification structure were described by the first and the second values, respectively, as reported by (Ref [25][26][27][28].…”

Section: Microstructure and Mechanical Properties Of As-builtmentioning

confidence: 99%

Effect of the Distance from Build Platform and Post-Heat Treatment of AlSi10Mg Alloy Manufactured by Single- and Multi-Laser Selective Laser Melting

Cerri

Ghio

Bolelli

2021

J. of Materi Eng and Perform

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In the present study, AlSi10Mg samples produced by selective laser melting (SLM) were studied. Samples were machined from two types of bars obtained through different methods: either single laser (SL) or multiple laser (ML) machine setup. The bars were built perpendicular to the platform, which was pre-heated at 150 °C (working temperature), up to a height of 300 mm. The effect of the distance from the platform on the mechanical properties was investigated through tensile samples in as-built condition and after unconventional heat treatments (U-HT). Tensile strength changed by 80 MPa along the Z-axis (build direction) for SL case and by 100 MPa for ML case in the as-built samples. Vickers microhardness revealed an analogous gradient. This was correlated to a gradient in intra-granular precipitates' distribution along the Z-axis, as revealed by scanning electron microscopy (SEM). An unconventional heat treatment at 175 °C for 6h slightly improves the mechanical strength; higher temperature treatments at 200 and 225 °C for the same duration cause a progressive decrease in strength with an increase in elongation. The amount and size of the precipitates and the thickness of eutectic Si change with the heat treatment temperature, justifying the mechanical behavior.

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Section: Microstructure and Mechanical Properties Of As-builtmentioning

confidence: 99%

Effect of the Distance from Build Platform and Post-Heat Treatment of AlSi10Mg Alloy Manufactured by Single- and Multi-Laser Selective Laser Melting

Cerri

Ghio

Bolelli

2021

J. of Materi Eng and Perform

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“…In LPBF, the directed solidification initially determines the texture as the material is exposed with a focused laser beam. The grain growth and the texture in a LPBF manufactured specimen are influenced by the melt pool geometry and the thermal gradients acting in the component [2]. As the melt pool solidifies, grains nucleate at the solidification front.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

“…During the subsequent grain growth, grains with different orientations compete [3]. Several studies found that grains with an orientation parallel to the melt pool boundary normal dominate during this phase [2,[4][5][6]. This preferred orientation results from the heat flow, which has its largest magnitude in the melt pool boundary's normal direction [7].…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

In situ microstructure analysis of Inconel 625 during laser powder bed fusion

et al. 2021

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Laser powder bed fusion is an additive manufacturing process that employs highly focused laser radiation for selective melting of a metal powder bed. This process entails a complex heat flow and thermal management that results in characteristic, often highly textured microstructures, which lead to mechanical anisotropy. In this study, high-energy X-ray diffraction experiments were carried out to illuminate the formation and evolution of microstructural features during LPBF. The nickel-base alloy Inconel 625 was used for in situ experiments using a custom LPBF system designed for these investigations. The diffraction patterns yielded results regarding texture, lattice defects, recrystallization, and chemical segregation. A combination of high laser power and scanning speed results in a strong preferred crystallographic orientation, while low laser power and scanning speed showed no clear texture. The observation of a constant gauge volume revealed solid-state texture changes without remelting. They were related to in situ recrystallization processes caused by the repeated laser scanning. After recrystallization, the formation and growth of segregations were deduced from an increasing diffraction peak asymmetry and confirmed by ex situ scanning transmission electron microscopy. Graphical Abstract

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“…As shown in Fig. 7a, the elongated grains grow perpendicular to the semicircular melt-pool boundary and toward the centerline of the melt pool, which is the hottest point 76 When processing of a whole part, each point in the part experiences several remelting processes during the process because of the neighboring tracks and subsequent layers. This repetitive remelting overgrows the elongated grains in the build direction with the highest temperature gradient.…”

Section: Microstructure Of Niti Alloy Processed By Lpbf: Grain Morphology Texture and Precipitationmentioning

confidence: 99%

Additive Manufacturing of NiTi Shape Memory Alloy for Biomedical Applications: Review of the LPBF Process Ecosystem

Safaei

Abedi

Nematollahi

et al. 2021

JOM

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NiTi shape memory alloys (SMAs) are used in a broad range of biomedical applications because of their unique properties including biocompatibility and high corrosion and wear resistance as well as functional properties such as superelasticity and the shape memory effect. The combination of SMAs and additive manufacturing can lead to revolutionary changes to the uses of SMAs in the biomedical industry. This article discusses the potential biomedical applications of NiTi that benefit from the AM process. We share the lessons learned in processing NiTi alloys with a focus on the laser powder bed fusion (LPBF) technique. The manufacturability, build quality, stable phases and transformation temperatures, microstructure, thermomechanical properties, microstructure tailoring, and functional properties of NiTi alloys produced via AM processing are reviewed. Current challenges such as expanding the process window, controlling the chemistry, and the performance and property responses are discussed, and potential opportunities including alloy design are discussed.

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Grain structure and texture of the SLM single track

Cited by 51 publications

References 22 publications

Effect of the Distance from Build Platform and Post-Heat Treatment of AlSi10Mg Alloy Manufactured by Single- and Multi-Laser Selective Laser Melting

Effect of the Distance from Build Platform and Post-Heat Treatment of AlSi10Mg Alloy Manufactured by Single- and Multi-Laser Selective Laser Melting

In situ microstructure analysis of Inconel 625 during laser powder bed fusion

Additive Manufacturing of NiTi Shape Memory Alloy for Biomedical Applications: Review of the LPBF Process Ecosystem

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