Effect of heat treatment on microstructure and mechanical properties of laser melting deposited Ni-base superalloy Rene′41

Li, J.; Wang, H.M.; Tang, Hao

doi:10.1016/j.msea.2012.04.037

Cited by 47 publications

(20 citation statements)

References 17 publications

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“…A debate for the presence of a transition at this temperature is also for Inconel 718 -which shows the same behavior at this temperature. Several authors [7][8][9][10] debate on the γ' precipitation starts temperature.…”

Section: Dilatometric Analysismentioning

confidence: 99%

“…The strengthening phase, denoted γ' also with a FCC crystal structure and a Ni3Al chemical formula, is a precipitate phase, often coherent with the matrix. Rene 41 owes its strength and stability both to the stable austenitic matrix, the gamma prime size and morphology and carbides -which are strongly affected by heat treatment [7]. In an optimally aged alloy the boundaries between γ and γ' particles are a substantial barrier for dislocation movement [8].…”

Section: Introductionmentioning

confidence: 99%

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Preliminary research for using Rene 41 in confectioning extrusion dies

Schwartz

Ciocoiu

Gheorghe

et al. 2015

WIT Transactions on Engineering Sciences

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The dies used for copper/brass hot extrusion made of tool steels failed after a small number of runs. The die must be either refurbished (reconditioned) either discarded or replaced by a new die. These results are not satisfactory for a good production, so we took into account a new alloy to use for confectioning the dies. Before the first die was readily made, an experiment was performed to justify the migration to this new alloy.Heating cycles are performed to observe microstructure evolution in Rene 41. These heating cycles mimic the usage conditions of the die in service, except the stresses during extrusion. The alloy at specific number of cycles is analyzed by optic and electron microscopy (SEM), X-ray diffraction analysis (XRD), Vickers microhardness investigations and dilatometric tests.Minor changes occurred in the microstructure: M23C6 carbides appeared at grain boundary and depleted adjacent regions in alloying elements.

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Section: Dilatometric Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preliminary research for using Rene 41 in confectioning extrusion dies

Schwartz

Ciocoiu

Gheorghe

et al. 2015

WIT Transactions on Engineering Sciences

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“…A very large amount of experimental research suggests that material properties are dependent on feedstock characteristics and process parameters [5][6][7][8]. Choren et al attempted to gather correlations describing Young's modulus and porosities for additive-manufacturing processes as a foundation for designers and process engineers.…”

Section: Introductionmentioning

confidence: 99%

Metal additive-manufacturing process and residual stress modeling

Megahed

Mindt

N’Dri

et al. 2016

Integr Mater Manuf Innov

225

113

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Additive manufacturing (AM), widely known as 3D printing, is a direct digital manufacturing process, where a component can be produced layer by layer from 3D digital data with no or minimal use of machining, molding, or casting. AM has developed rapidly in the last 10 years and has demonstrated significant potential in cost reduction of performance-critical components. This can be realized through improved design freedom, reduced material waste, and reduced post processing steps. Modeling AM processes not only provides important insight in competing physical phenomena that lead to final material properties and product quality but also provides the means to exploit the design space towards functional products and materials. The length-and timescales required to model AM processes and to predict the final workpiece characteristics are very challenging. Models must span length scales resolving powder particle diameters, the build chamber dimensions, and several hundreds or thousands of meters of heat source trajectories. Depending on the scan speed, the heat source interaction time with feedstock can be as short as a few microseconds, whereas the build time can span several hours or days depending on the size of the workpiece and the AM process used. Models also have to deal with multiple physical aspects such as heat transfer and phase changes as well as the evolution of the material properties and residual stresses throughout the build time. The modeling task is therefore a multi-scale, multi-physics endeavor calling for a complex interaction of multiple algorithms. This paper discusses models required to span the scope of AM processes with a particular focus towards predicting as-built material characteristics and residual stresses of the final build. Verification and validation examples are presented, the over-spanning goal is to provide an overview of currently available modeling tools and how they can contribute to maturing additive manufacturing.

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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%

“…In the deposited sample the coarse and fine particles sizes where approximately 0.35 p,m and 0.08 p,m, respectively whereas the cast sizes for the coarse and fine particles where 0.75 p,m and 0.14 p,m, respectively. • J. Li et al [37] investigated the effect of solution heat treatment on laser deposited…”

Section: B U Ild -U P D Ire C Tio Nmentioning

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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Effect of heat treatment on microstructure and mechanical properties of laser melting deposited Ni-base superalloy Rene′41

Cited by 47 publications

References 17 publications

Preliminary research for using Rene 41 in confectioning extrusion dies

Preliminary research for using Rene 41 in confectioning extrusion dies

Metal additive-manufacturing process and residual stress modeling

Review of Laser Deposited Superalloys Using Powder as an Additive

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