Crystallographic orientation control of pure chromium via laser powder bed fusion and improved high temperature oxidation resistance

Gokcekaya, Ozkan; Hayashi, Naohiro; Ishimoto, Takuya; Ueda, Kyosuke; Narushima, Takayuki; Nakano, Takayoshi

doi:10.1016/j.addma.2020.101624

Cited by 51 publications

(47 citation statements)

References 58 publications

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“…27 Following that study, many other papers reporting positive control of the crystal orientation to control product functionality have been published. 33,37,38 As described above, the melt-pool shape significantly affects the texture development behavior via the change in the growth direction of the elongated cells. Because the melt-pool shape varies with the energy density during L-PBF, as shown in the previous section, texture variations depending on the laser power are expected under specific circumstances.…”

Section: Texture Development Mechanism In Fcc and Bcc Materialsmentioning

confidence: 99%

Control of Anisotropic Crystallographic Texture in Powder Bed Fusion Additive Manufacturing of Metals and Ceramics—A Review

Hagihara

Nakano

2021

JOM

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Additive manufacturing (AM) enables the production of complex, net-shape geometries. Additionally, in AM of metal and ceramics, which has received less attention, the microstructure and texture of the product can be arbitrarily controlled by selecting appropriate process parameters, thereby enabling unprecedented superior properties. This paper discusses recent progress pertaining to texture evolution mechanisms and control methods, with an emphasis on selective laser melting. One of the unique characteristics of AM is that the texture can be varied as a function of position within the product by controlling the scan strategy. The transient behavior of the texture and the factor used to control it via the scan strategy are discussed. In addition, the texture evolution behavior of face- and body-centered cubic as well as noncubic materials is discussed. The importance of the crystallographic “multiplicity” of the preferential crystal growth direction is described to understand the evolution behavior of the texture in such materials.

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Section: Texture Development Mechanism In Fcc and Bcc Materialsmentioning

confidence: 99%

Control of Anisotropic Crystallographic Texture in Powder Bed Fusion Additive Manufacturing of Metals and Ceramics—A Review

Hagihara

Nakano

2021

JOM

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“…[11] under Creative Commons CC BY NC ND license, (b) pure Cr texture control with changes in energy density reused from Ref. [12] under Creative Commons CC-BY license, (c) nickel superalloy 718 texture control with laser power and laser power profile shape reused from Ref. [13] with permission.…”

Section: List Of Figuresmentioning

confidence: 99%

“…The three examples in Fig. 1 show (a) manipulation of crystal texture in the X-plane with laser scan strategy [11], (b) crystallographic texture intensity decreasing with decreasing volumetric energy density [12], and (c) manipulation of crystal texture with laser power and power profile shape [13]. DebRoy et al [8] summarize the texture development process as competitive growth where easy growth crystal orientations aligned with the maximum heat flow outgrow slower, misaligned crystal orientations.…”

Section: Crystallographic Texturementioning

confidence: 99%

Understanding anisotropic tensile properties of laser powder bed fusion additive metals :

Weaver¹,

Rosenthal²

2021

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There are several physical reasons for anisotropic mechanical properties in additively manufactured metals. These include but are not limited to directionally dependent grain and phase morphology; crystallographic texture; directional porosity/defects; and heterogeneity associated with the melt pool, layer wise microstructure. All of these are prevalent in most additive manufacturing processes, and it is difficult to separate out the role that each play in the mechanical anisotropy. This review focuses on studies that have attempted to or reasonably isolate one or two of these sources rather than simply report on trends in mechanical properties. This is not an exhaustive review covering all additive process or mechanical properties; the main assessment is on laser powder bed fusion (LPBF) metals and tensile test results (modulus, yield strength, ultimate tensile strength (UTS), elongation, and fracture surface analysis). In summary, the primary sources of anisotropic tensile properties for LPBF alloys are crystallographic texture, anisotropic microstructure morphologies, lack of fusion defects, and the melt pool macrostructure. Within anisotropic microstructures, elongated grains appear to be secondary compared to the preferential distribution of phases and features (e.g., grain boundary alpha, precipitates, etc.). Anisotropic modulus and yield strength are primarily caused by crystallographic texture. This is supported by crystal plasticity simulations. Anisotropic elongation is primarily caused by anisotropic microstructure morphologies, lack of fusion defects, and melt pool macrostructure. The evidence to support this comes from fracture surfaces that follow these features. Melt pool macrostructure is the most challenging to experimentally isolate from the list of other sources of anisotropy. Strategies to characterize and manipulate crystallographic texture, porosity, grain and phase morphology, and melt pool macrostructures are required to better understand and control mechanical anisotropy in AM metals.

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“…Furthermore, this technique has been proven to be extremely useful for controlling the microstructure of metallic materials, particularly their crystallographic textures. 15) Crystallographic texture is a significant metallographic feature that governs mechanical properties such as Young's modulus 1) and yield stress, 4) and chemical properties such as oxidation resistance, 5) of metals independently of shape. Its flexible control is indispensable for enhancing the functionality of metallic parts.…”

Section: Introductionmentioning

confidence: 99%

Modified Cellular Automaton Simulation of Metal Additive Manufacturing

2021

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Metal additive manufacturing (AM) technologies are attracting attentions not only as a fabrication process of complicated threedimensional parts but also as microstructure controlling processes. In powder bed fusion (PBF)-type AM, crystallographic texture can be controlled by scanning strategies of energy beam. To optimize microstructures, computer simulations for predicting microstructures play very important roles. In this work, we have developed simulation programs to explain the mechanism of the crystal orientation control. First, we simulated the shape of melt pool by analyzing the heat transfer using apparent heat conductivity when the penetration of laser beam through keyholes was taken into consideration because of the evaporation and accompanying convections. It was assumed that the primary crystal growth direction can be determined by the temperature gradient, and the crystals grow keeping the growth direction as generally recognized. The shapes of simulated melt pools agree well with experimental observations. The modified cellular automaton simulations successfully reproduced two typical textures with different preferential orientations along the building directions of ©100ª and ©110ª when the bidirectional scanning with and without a rotation of 90°, respectively, was accomplished between the layers.

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Crystallographic orientation control of pure chromium via laser powder bed fusion and improved high temperature oxidation resistance

Cited by 51 publications

References 58 publications

Control of Anisotropic Crystallographic Texture in Powder Bed Fusion Additive Manufacturing of Metals and Ceramics—A Review

Control of Anisotropic Crystallographic Texture in Powder Bed Fusion Additive Manufacturing of Metals and Ceramics—A Review

Understanding anisotropic tensile properties of laser powder bed fusion additive metals :

Modified Cellular Automaton Simulation of Metal Additive Manufacturing

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