Nanoscale serration characteristics of additively manufactured superalloys

Rowe, Russell A.; Tajyar, Ali; Munther, Michael; Johanns, Kurt E.; Allison, P. G.; Momeni, Kasra; Davami, Keivan

doi:10.1016/j.jallcom.2020.156723

Cited by 8 publications

(2 citation statements)

References 88 publications

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“…Efficient computational tools have been developed to perform simulations within timespans not accessible to experimental studies [ 22 , 23 ]. We may refer to large-scale continuum simulations [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ], phase-field simulations for capturing the microstructure [ 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ], MD simulations to capture the atomistic mechanisms [ 2 , 47 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 ], and multiscale simulations to capture the broad spectrum of materials and processes response [ 24 , 25 , 46 ,…”

Section: Introductionmentioning

confidence: 99%

A Modified Embedded-Atom Method Potential for a Quaternary Fe-Cr-Si-Mo Solid Solution Alloy

et al. 2023

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Ferritic-martensitic steels, such as T91, are candidate materials for high-temperature applications, including superheaters, heat exchangers, and advanced nuclear reactors. Considering these alloys’ wide applications, an atomistic understanding of the underlying mechanisms responsible for their excellent mechano-chemical properties is crucial. Here, we developed a modified embedded-atom method (MEAM) potential for the Fe-Cr-Si-Mo quaternary alloy system—i.e., four major elements of T91—using a multi-objective optimization approach to fit thermomechanical properties reported using density functional theory (DFT) calculations and experimental measurements. Elastic constants calculated using the proposed potential for binary interactions agreed well with ab initio calculations. Furthermore, the computed thermal expansion and self-diffusion coefficients employing this potential are in good agreement with other studies. This potential will offer insightful atomistic knowledge to design alloys for use in harsh environments.

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Section: Introductionmentioning

confidence: 99%

A Modified Embedded-Atom Method Potential for a Quaternary Fe-Cr-Si-Mo Solid Solution Alloy

et al. 2023

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“…Inconel 625 (IN 625) is a solid-solution, nickelchromium-niobium-molybdenum alloy with outstanding resistance to high temperature and corrosive environments as well as excellent creep and fatigue characteristics [1,2]. This material has drawn particular interest in various industrial sectors including power generation, aeronautical, marine, and petrochemical applications, due to its excellent attributes [3][4][5]. In recent years an additive manufacturing technology coined laser powder bed fusion (LPBF) has emerged as a successful tool for the fabrication of IN 625 parts with high density, good surface finish, and mechanical properties [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Multi-cycling nanoindentation in additively manufactured Inconel 625 before and after laser peening

Tajyar¹,

Brooks²,

Vaseghi³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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In this research, a room temperature multicycle nanoindentation technique was implemented to evaluate the effects of the laser peening (LP) process on the surface mechanical behavior of additively manufactured (AM) Inconel 625. Repetitive deformation was introduced by loading-unloading during an instrumented nanoindentation test on the as-built (No LP), 1-layer, and 4-layer laser peened (1LP and 4LP) conditions. It was observed that laser-peened specimens had a significantly higher resistance to penetration of the indenter and lower permanent deformation. This is attributed to the pre-existing dislocation density induced by LP in the material which affects the dislocation interactions during the cyclic indentation. Moreover, high levels of compressive stresses, which are greater in the 4LP specimen than the 1LP specimen, lead to more effective improvement of surface fatigue properties. The transition of the material response from elastic-plastic to almost purely elastic in 4LP specimens was initiated much earlier than it did in the No LP, and 1LP specimens. In addition to the surface fatigue properties, hardness and elastic modulus were also evaluated and compared.

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Two types of η phase synergistically improving the mechanical properties of LDED CoCrFeNiTi high-entropy alloy

Zhang,

Mu,

Cai

2024

J Mater Sci

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Nanoscale serration characteristics of additively manufactured superalloys

Cited by 8 publications

References 88 publications

A Modified Embedded-Atom Method Potential for a Quaternary Fe-Cr-Si-Mo Solid Solution Alloy

A Modified Embedded-Atom Method Potential for a Quaternary Fe-Cr-Si-Mo Solid Solution Alloy

Multi-cycling nanoindentation in additively manufactured Inconel 625 before and after laser peening

Two types of η phase synergistically improving the mechanical properties of LDED CoCrFeNiTi high-entropy alloy

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