The influence of scan length on fabricating thin-walled components in selective laser melting

Li, Zhonghua; Xu, Renjun; Zhang, Zhengwen; Küçükkoç, İbrahim

doi:10.1016/j.ijmachtools.2017.11.012

Cited by 118 publications

(45 citation statements)

References 22 publications

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“…SLM technology is an additive manufacturing technique in which metal powder is completely melted under the action of the heat of a laser beam and solidified by cooling [3]. SLM is a promising additive manufacturing process that has the advantage of forming complex geometries [4]. SLM uses a high-energy laser beam to selectively melt metal powder and directly form dense metal parts, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Tensile Properties of AlSi10Mg Alloy Manufactured by Multi-Laser Beam Selective Laser Melting (SLM)

Kuai

Bai

et al. 2019

Metals

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The multi-beam selective laser forming system is a new type of powder bed laser forming equipment that is different from single-laser selective laser melting (SLM) printers. It is a new generation for a metal powder material moulding process that has high efficiency, large size and batch manufacturing. It is a new development of a powder bed laser forming process trend. In this paper, the microstructure and tensile properties of both the multi-laser-formed AlSi10Mg isolated and overlap areas are studied to ensure that the parts can achieve perfect seamless splicing and to identify whether the parts in different regions have the same performance. It was discovered that as the number of scans increases, the depth and width of the melt pool and microscopic grain structure in the overlap zone increase. The preferential crystallite growth orientation reaches the (200) plane. A small amount of smooth surface appeared at the fracture of the overlap area of the two scans, the dimples were reduced and the structure became larger, resulting in a decrease in tensile properties.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Tensile Properties of AlSi10Mg Alloy Manufactured by Multi-Laser Beam Selective Laser Melting (SLM)

Kuai

Bai

et al. 2019

Metals

Self Cite

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“…SLM can quickly and accurately produce metallic components of any complex shape on the SLM equipment through 3D CAD data directly [3,4,5]. In the SLM, the 3D CAD model is imported into the SLM software system and afterwards sliced into layers with a certain thickness [3].…”

Section: Introductionmentioning

confidence: 99%

The Heat Treatment Influence on the Microstructure and Hardness of TC4 Titanium Alloy Manufactured via Selective Laser Melting

Zhao

Bai

et al. 2018

Materials

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In this research, the effect of several heat treatments on the microstructure and microhardness of TC4 (Ti6Al4V) titanium alloy processed by selective laser melting (SLM) is studied. The results showed that the original acicular martensite α′-phase in the TC4 alloy formed by SLM is converted into a lamellar mixture of α + β for heat treatment temperatures below the critical temperature (T0 at approximately 893 °C). With the increase of heat treatment temperature, the size of the lamellar mixture structure inside of the TC4 part gradually grows. When the heat treatment temperature is above T0, because the cooling rate is relatively steep, the β-phase recrystallization transforms into a compact secondary α-phase, and a basketweave structure can be found because the primary α-phase develop and connect or cross each other with different orientations. The residence time for TC4 SLM parts when the treatment temperature is below the critical temperature has little influence: both the α-phase and the β-phase will tend to coarsen but hinder each other, thereby limiting grain growth. The microhardness gradually decreases with increasing temperature when the TC4 SLM part is treated below the critical temperature. Conversely, the microhardness increases significantly with increasing temperature when the TC4 SLM part is treated above the critical temperature.

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“…The structures in Figure 6 a exhibit characteristics of alternating light and dark lines, because of different crystal orientations. Due to the fast cooling rates in the SLM process, the microstructure of SLMed TC4 is mainly composed of acicular α′ martensite phase [ 28 ], as shown in Figure 6 b. SLMed TC4 consisting entirely of α′ phase generally exhibits a poor elongation at failure, because α′ martensite grains do not form slat colonies with the same orientation, and the effective slip length is limited to a single size [ 29 ]. However, the microstructure of SLMed TC4 changed after high temperature wetting with BNi2 filler metal.…”

Section: Resultsmentioning

confidence: 99%

Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate

Liu

Ouyang

et al. 2020

Materials

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The wetting kinetics of nickel-based filler metal (BNi2) over selective laser-melted Ti-6Al-4V (SLMed TC4) titanium alloy in a protective argon atmosphere is experimentally investigated using a real-time in situ hot stage equipped with an optical microscope. The spreading processes at different temperatures are similar, and the overall wetting/spreading process can be roughly divided into three stages: (i) an initial stage, (ii) a rapid spreading stage, and (iii) an asymptotic stage. Moreover, the wetting kinetics of the BNi2/SLMed TC4 system can be expressed by empirical power exponential function Rn~t with n = ~1. In the process of spreading, Ti-based solid solution (Ti(ss)) and intermetallic compound (Ti2Ni and TiB2) were formed at the interface within the reaction domain, and the phase transition of α’ martensitic to α-Ti and β-Ti also took place. The influence of elevated temperature on the spreading and wetting kinetics of the BNi2/SLMed TC4 system was studied, and the results show that the increase of temperature has a slightly promoting effect on the spreading, but a limited impact on the value of n. In addition, the spreading and wetting kinetics of BNi2/SLMed TC4 system are similar to those of BNi2 on conventional forged TC4 substrate.

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The influence of scan length on fabricating thin-walled components in selective laser melting

Cited by 118 publications

References 22 publications

Microstructure and Tensile Properties of AlSi10Mg Alloy Manufactured by Multi-Laser Beam Selective Laser Melting (SLM)

Microstructure and Tensile Properties of AlSi10Mg Alloy Manufactured by Multi-Laser Beam Selective Laser Melting (SLM)

The Heat Treatment Influence on the Microstructure and Hardness of TC4 Titanium Alloy Manufactured via Selective Laser Melting

Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate

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