Laser rapid forming of SS316L/Rene88DT graded material

Lin, Xin; Yue, Tai Man; Yang, Haiou; Huang, Weidong

doi:10.1016/j.msea.2004.08.072

Cited by 122 publications

(54 citation statements)

References 31 publications

(36 reference statements)

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“…Hardness values of LPBF 316 L steel have been collected from our own measurements and from the literature [19,22,23]. For a comparison, hardness for 316 L steel manufactured by direct laser deposition was collected from [36,[53][54][55][56]. Hardness for conventional and nanoscale 316 L steel was found in [57][58][59].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure, Solidification Texture, and Thermal Stability of 316 L Stainless Steel Manufactured by Laser Powder Bed Fusion

Krakhmalev

Fredriksson

Svensson

et al. 2018

Metals

144

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This article overviews the scientific results of the microstructural features observed in 316 L stainless steel manufactured by the laser powder bed fusion (LPBF) method obtained by the authors, and discusses the results with respect to the recently published literature. Microscopic features of the LPBF microstructure, i.e., epitaxial nucleation, cellular structure, microsegregation, porosity, competitive colony growth, and solidification texture, were experimentally studied by scanning and transmission electron microscopy, diffraction methods, and atom probe tomography. The influence of laser power and laser scanning speed on the microstructure was discussed in the perspective of governing the microstructure by controlling the process parameters. It was shown that the three-dimensional (3D) zig-zag solidification texture observed in the LPBF 316 L was related to the laser scanning strategy. The thermal stability of the microstructure was investigated under isothermal annealing conditions. It was shown that the cells formed at solidification started to disappear at about 800 • C, and that this process leads to a substantial decrease in hardness. Colony boundaries, nevertheless, were quite stable, and no significant grain growth was observed after heat treatment at 1050 • C. The observed experimental results are discussed with respect to the fundamental knowledge of the solidification processes, and compared with the existing literature data.

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Section: Mechanical Propertiesmentioning

confidence: 99%

“…This is an important observation because the primary cell spacing can be directly controlled through alterations of laser power and laser scanning speed [7]. [19,22,23,36,[53][54][55][56][57][58][59].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructure, Solidification Texture, and Thermal Stability of 316 L Stainless Steel Manufactured by Laser Powder Bed Fusion

Krakhmalev

Fredriksson

Svensson

et al. 2018

Metals

144

View full text Add to dashboard Cite

show abstract

“…Accordingly, the solidification velocity will reach a maximum at the top surface of the melt pool and it will be close to the laser scanning velocity. Under such a condition, a columnar to equiaxed transition (CET) of crystal growth is often found in laser melting and laser cladding, especially towards the final stage of the solidification process [28]. However, such a phenomenon was not observed in the laser re-melted layer (Figure 3).…”

Section: Columnar To Equiaxed Transitionmentioning

confidence: 99%

Microstructure of Laser Re-Melted AlCoCrCuFeNi High Entropy Alloy Coatings Produced by Plasma Spraying

Yue

Xie

Lin

et al. 2013

Entropy

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An AlCoCrCuFeNi high-entropy alloy (HEA) coating was fabricated on a pure magnesium substrate using a two-step method, involving plasma spray processing and laser re-melting. After laser re-melting, the microporosity present in the as-sprayed coating was eliminated, and a dense surface layer was obtained. The microstructure of the laser-remelted layer exhibits an epitaxial growth of columnar dendrites, which originate from the crystals of the spray coating. The presence of a continuous epitaxial growth of columnar HEA dendrites in the laser re-melted layer was analyzed based on the critical stability condition of a planar interface. The solidification of a columnar dendrite structure of the HEA alloy in the laser-remelted layer was analyzed based on the Kurz-Giovanola-Trivedi model and Hunt's criterion, with modifications for a multi-component alloy.

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“…This induces a high temperature gradient ahead of the solidliquid interface; meanwhile the interface moving velocity is low at the bottom of the molten pool [16,17] . So a columnar dendrite structure will be fi rst developed at the solidifi ed zone.…”

Section: Microstructurementioning

confidence: 99%

Fabrication and microstructure of CaTiO3 coating by laser cladding

Lü

Lin

et al. 2011

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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In order to explore the way to improve the adhesion of the calcium phosphate bioceramic coating to Ti substrate, the CaTiO 3 coating was fabricated on Ti substrate by laser cladding (LC) using powders of CaCO 3 and CaHPO 4 , and then the composition and microstructure of the coatings were investigated. During LC, CaCO 3 can hardly react with Ti, and the coating fabricated using CaCO 3 powder is mainly composed of the process of CaO, the decomposition product of CaCO 3 . Moreover, the coating has a loosened structure and part of it has peeled off from the substrate. CaHPO 4 reacts vigorously with Ti, and the coating fabricated using CaHPO 4 mainly consists of CaTiO 3 which is one of the reaction products between Ti and CaHPO 4 . Chemical bonding is formed at the interface between coating and substrate, which may enhance the adhesion of the CaTiO 3 coating to Ti substrate. Furthermore, CaTiO 3 dendrite and eutectic of CaTiO 3 and Ca 2 P 2 O 7 are found on the surface of the coating, implying that a transition can be formed between CaTiO 3 and some calcium phosphate bioceramic. So CaTiO 3 coating fabricated using CaHPO 4 can be a potential candidate to improve the adhesion between calcium phosphate coating and Ti substrate. However, there are also pores and cracks existing in the coating, which may degrade the mechanical properties of the coating.

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Laser rapid forming of SS316L/Rene88DT graded material

Cited by 122 publications

References 31 publications

Microstructure, Solidification Texture, and Thermal Stability of 316 L Stainless Steel Manufactured by Laser Powder Bed Fusion

Microstructure, Solidification Texture, and Thermal Stability of 316 L Stainless Steel Manufactured by Laser Powder Bed Fusion

Microstructure of Laser Re-Melted AlCoCrCuFeNi High Entropy Alloy Coatings Produced by Plasma Spraying

Fabrication and microstructure of CaTiO3 coating by laser cladding

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