Microstructures and mechanical properties of A356 (AlSi7Mg0.3) aluminum alloy fabricated by selective laser melting

Kimura, Tsuyoshi; Nakamoto, Tetsuji

doi:10.1016/j.matdes.2015.10.065

Cited by 301 publications

(108 citation statements)

References 17 publications

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“…These formations are generally thought to be caused by the different solidification rates in the molten pool area along the direction of the thermal gradient. A similar observation has also been reported in the literature, where SLM has been employed to process aluminium alloys [6,26,27].…”

Section: Resultssupporting

confidence: 84%

Effect of heat treatment and laser surface remelting on AlSi10Mg alloy fabricated by selective laser melting

Han

Jiao

2019

Int J Adv Manuf Technol

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The selective laser melting (SLM) of aluminium alloys is of interest to researchers because of these alloys' potential applications in the aerospace and automotive domains. Post-processing is generally required in order to enhance the mechanical properties of devices that involve moving parts, where surface mechanical properties are significant factors. This paper describes a preliminary study that was conducted to investigate the effect of post-processing on the microstructure and mechanical properties of SLM fabricated AlSi10Mg alloy, with an emphasis on the laser surface remelting (LSR) process. The experimental results demonstrate that the heat treatment degraded tensile strength while improving ductility by achieving grain growth and residual stress release. The yield strength obtained in the experiment was reduced from 200 to 100 MPa, whereas the elongation increased from 6 to 22%. The LSR process was found to contribute to an improvement in surface finish. The surface roughness indicator R a was determined to be 0.93 μm in the LSR post-processed sample, compared to a fairly high value of 19.3 μm in the as-fabricated samples. The LSR process also enhanced the microhardness by refining the microstructure; the Si eutectic dendritic structure that formed was found to be finer than that of the as-fabricated samples. Compared to the as-fabricated samples, the LSR process contributed to a 19.5% increase in microhardness. The findings suggest that the microstructure and mechanical properties of SLM-fabricated AlSi10Mg parts could be tailored by suitable post-processing such as heat treatment and LSR. The significance of this research is its proposal of a novel technique to enhance surface hardness using LSR, which is a significant step towards the combination of SLM and LSR processes to manufacture customised aluminium components for the automotive and aerospace sectors.

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Section: Resultssupporting

confidence: 84%

Effect of heat treatment and laser surface remelting on AlSi10Mg alloy fabricated by selective laser melting

Han

Jiao

2019

Int J Adv Manuf Technol

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“…[37,[111][112][113][114] Secondly, the scan speed has a noteworthy impact on the shape of the melt pool, with increasing scan speeds the melt pool width decreases, which requires to reduce hatch distances to account for it, while the melt pool length increases. References pure Al >99.5 [143] AlSi0.5 $100 [120] Al6061 (AlMg1SiCu) 96.5 [144] Al7075 (AlZn5.5MgCu) 95.1 [145] Al7075 þ 4 wt% Si 98.9 [145,146] A356 (AlSi7Mg0.3) 99.8 [147] A357 (AlSi7Mg0.6) 99.5 [148] A360 (AlSi9.5Mg0.5) 99.8 [146] AlSi10Mg 99.5 %100 [36,64,73,115,120,122,131,137,[149][150][151][152][153] AlSi25 %100 [120] AlMg3 %100 [120] AlSi9Cu3 99.5 [137] Al-3.5Cu-1.5Mg-1Si >98 [154] AlMgScZr (Scalmalloy) >99 %100 [100,116,137] AlSi10Mg reinforced with 5 wt% TiC 99.5 [155] AlSi10Mg reinforced with 1 wt% TiB 2 99.2 [152] AlSi10Mg reinforced with 10 wt% TiB 2 98 [152] AlSi10Mg reinforced with 0.5 wt% MgAl 2 O 4 99.3 [152] a) common relates to consistent results found in multiple publications. In addition to the complexity of determining a suitable set of fabrication parameters, various raw materials differ widely in their requirements and their absorptivity of the laser power, and their heat conductivity.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

et al. 2018

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Additive manufacturing has multiple advantages over conventional fabrication techniques, such as the geometrical freedom and, to a great extent, the omission of tooling equipment. Hence, futuristic designs and non-standard topology-optimized structures can be fabricated without causing noteworthy extra cost, since the geometrical complexity is, exaggeratedly spoken, for free. The manufacturing time and the amount of required raw material are the key criteria, which determine the expenses. What at first glance appears as an engineer's dream, introduces its complexity in the description of the material's characteristics and their volatility to the manufacturing conditions. Within this study, the main properties (i.e., surface hardness, tensile, and compression strength, as well as fracture toughness) and their anisotropic and inhomogeneous nature are addressed. Detailed overviews of the progress to date for aluminum, iron, titanium, cobalt, and nickel based raw materials are provided. Furthermore, an overview about the state-of-the-art in the medical sector is included, comprising the areas of utilization and several trail studies.

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“…While, the vertical cross section exhibits elongated acicular microstructures along the melting layer stacking direction. These fine cellular and acicular microstructures are exclusive to the SLM process, it would form in response to the instant melting and rapid solidification with extreme high cooling rate of the powder alloy during the laser irradiation [13]. …”

Section: Overlap Stripsmentioning

confidence: 99%

Microstructure and Mechanical Properties of 18Ni-300 Maraging Steel Fabricated by Selective Laser Melting

Tan¹,

Zhou²,

Tong³

et al. 2016

Proceedings of the 2016 6th International Conference on Advanced Design and Manufacturing Engineering (ICADME 2016)

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High-strength 18Ni-300 maraging steel parts were fabricated by selective laser melting (SLM) additive manufacturing. Aging treatment at 490 ºC for 6 hours was applied for improving the mechanical properties of SLM fabricated parts. The microstructure and properties of the as-fabricated SLM 18Ni-300 parts were carefully characterized and analyzed. The results show that the relatively low surface roughness, with 4.16μm for horizontal surface and 4.79μm for vertical surface, certified the high accuracy of forming process. The almost fully dense microstructures of the as-fabricated SLM specimens were consisted of sub-micron dendritic cellular structures for horizontal cross-section and elongated acicular structures for vertical cross section. Due to precipitated-phase strengthening, the hardness increased from 35~36 HRC to 51~55 HRC after heat treatment. Meanwhile, the ultimate tensile strength (Rm) increases from 1165 MPa to 2014 MPa, which increased by about 73%; while the break elongation (ε) was reduced from 12.44% to 3.28%, owing to the increased embrittlement caused by the heat treatment. The substantial plastic deformation and dispersively distributed dimples in the fracture morphologies indicated a ductile fracture of as-fabricated tensile specimens, while the age-hardened tensile specimen encountered with a main fracture mode of brittle fracture.

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Microstructures and mechanical properties of A356 (AlSi7Mg0.3) aluminum alloy fabricated by selective laser melting

Cited by 301 publications

References 17 publications

Effect of heat treatment and laser surface remelting on AlSi10Mg alloy fabricated by selective laser melting

Effect of heat treatment and laser surface remelting on AlSi10Mg alloy fabricated by selective laser melting

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

Microstructure and Mechanical Properties of 18Ni-300 Maraging Steel Fabricated by Selective Laser Melting

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