Potential of direct metal deposition technology for manufacturing thick functionally graded coatings and parts for reactors components

Thivillon, L.; Bertrand, Ph.; Laget, Bernard; Smurov, I.

doi:10.1016/j.jnucmat.2008.11.023

Cited by 111 publications

(40 citation statements)

References 6 publications

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“…They can also be implemented to perform repair operations in situations that would otherwise require fabrication of replacement parts or molds [14,15]. Furthermore, based on the state-of-the-art techniques, functionally graded material can be easily obtained through adjusting the multi-channel powder feeder [16][17][18] or combining powder and wire deposition [19,20].…”

Section: Introductionmentioning

confidence: 99%

Characterization of stainless steel parts by Laser Metal Deposition Shaping

et al. 2014

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Section: Introductionmentioning

confidence: 99%

Characterization of stainless steel parts by Laser Metal Deposition Shaping

et al. 2014

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“…These elements include: aluminum, boron, carbon, chromium, cobalt, hafnium, iron, magnesium, manganese, molybdenum, niobium, rhenium, tantalum, titanium, tungsten, and zirconium [15]. A broad range of superalloys has been evaluated for LMD including Alloy-625 [13,[16][17][18][19][20], Alloy-718 [6,[21][22][23][24][25][26][27][28][29][30][31], Alloy-738 [12,32], CMSX4 [33][34][35], Rene41 [36,37] and Waspaloy [10,38]. There are some parameters of particular importance to LMD, as listed in Table 1, to have a controlled deposition.…”

Section: Materials Characteristics and Process Parametersmentioning

confidence: 99%

Review of Laser Deposited Superalloys Using Powder as an Additive

Segerstark¹,

Andersson²,

Svensson³

2014

8th International Symposium on Superalloy 718 and Derivatives (2014)

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In this paper laser metal deposition (LMD) with blown powder was reviewed with respect to the material behavior of nickel and nickel-iron based superalloys. The key benefits of LMD are claimed to be increased design freedom of components as well as reduced environmental impact since it enables near net shape manufacturing. This review considers the LMD processing parameters such as laser power, powder feed rate, spot size, standoff distance, and traverse speed, together with aspects related to the powder e.g. morphology, porosity, inclusion and satellite content. Special emphasis was put on how these parameters affect the deposit and substrate in terms of cracking, porosity, inclusions, phase transformations, and other material related phenomena. A characteristic microstructure of LMD deposited superalloys has a columnar dendrite growth in the vertical build up direction. The grain growth can however be manipulated, making it more equiaxed by, for instance, altering process parameters and/or scanning path. Residual stresses in LMD samples are unevenly distributed and large residual tensile stresses can be found at the surface of the deposit while large compressive stresses are located close to the substrate in the core of the deposit. One of the most important parameter is considered to be the specific energy input which largely influences the m elt pool during deposition which in turn can be related to the microstructure, residual stress and, process related defects such as porosity, cracking, lack of fusion and, dilution.

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“…It has an outstanding fatigue and thermalfatigue strength, good oxidation and corrosion resistance, excellent resistance to stress corrosion cracking and pitting resistance at elevated temperature, and excellent characteristics for welding and brazing [24]. It derives its strength from the stiffening effect of molybdenum and niobium on its nickel-chromium matrix; thus, precipitation-hardening treatments are not required [25]. Thus, Inconel-625 is an alloy with many ongoing and potential applications in various engineering industries.…”

Section: Details Of Materialsmentioning

confidence: 99%

Studies on laser rapid manufacturing of cross-thin-walled porous structures of Inconel 625

Paul

Mishra

Premsingh

et al. 2011

Int J Adv Manuf Technol

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An in-house developed continuous wave CO 2 laser-based rapid manufacturing was deployed to fabricate porous structures of Inconel-625 using a new cross-thinwall fabrication strategy. Studies on the mechanical and metallurgical properties of these porous structures were carried out with laser energy per unit traverse length in the range of 150-300 kJ/m, powder fed per unit traverse length in the range of 16.67-36.67 g/m and transverse traverse index in the range of 0.7-1.3. The processing parametric dependence showed that the powder fed per unit traverse length was a predominating parameter in determining the porosity of the structures, followed by transverse traverse index and laser energy per unit traverse length. The compression testing of fabricated porous structures showed that the material had anisotropy up to 20% for 0.2% yield strength. It was found that the yield strength of the fabricated structures followed the power law and decreased from 423±8 MPa for 2.63±0.14% porosity to 226± 6.8 MPa for 11.57±0.52% porosity. Scanning electron microscopy showed that shape of the pores was triangular due to the cross-thin-wall fabrication strategy and the observed values of microhardness were in the range 256-370 VHN 0.98N . These studies are expected to augment our knowledge on the fabrication of porous structures with independent control on porosity and yield strength, which are important prerequisites for some of the prosthetic and engineering components in niche areas of applications.

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Potential of direct metal deposition technology for manufacturing thick functionally graded coatings and parts for reactors components

Cited by 111 publications

References 6 publications

Characterization of stainless steel parts by Laser Metal Deposition Shaping

Characterization of stainless steel parts by Laser Metal Deposition Shaping

Review of Laser Deposited Superalloys Using Powder as an Additive

Studies on laser rapid manufacturing of cross-thin-walled porous structures of Inconel 625

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