Mesoscale Simulations for AM Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: closed (1 April 2022) | Viewed by 2926

Special Issue Editor


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Guest Editor
Oak Ridge National Laboratory, Computational Sciences and Engineering Division, Oak Ridge, TN 37830, USA
Interests: simulations; processing-structure-property; additive manufacturing; high-performance computing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The special issue will focus on advances in computational approaches, data-driven approaches, and the use of high-performance computing platforms to address the challenges involved in simulating processing-microstructure-property linkages in AM alloys. Specifically, this topic will focus on the following topics: (1) simulating the solidification microstructures and solid-state phase transformations that occur under thermal conditions typical of AM processes for structural, multi-component alloys using either laser or e-beam sources using realistic AM process thermal boundary conditions, (2) post-process heat treatments to optimize structure for meeting specific property requirements, and (3) mesoscale simulations of mechanical response of AM microstructures using crystal plasticity based approaches. The overall goal is to quantify how changes in AM process parameters and/or changes in local cross-sections in an AM component can affect the local microstructure and the local mechanical properties. The emphasis is to highlight how realistic modeling of AM processes can be handled utilizing emerging high performance computational platforms and recent developments in computational approaches including the utilization of GPUs to allow handling of statistically significant computational domain sizes with the spatial resolution required to handle the local structural features and their mechanical response. Finally, the special issue will also include data-driven approaches including machine-learning concepts to develop reduced order models for processing-structure and structure-property relationships for AM-processed structural alloys.

Dr. Balasubramaniam Radhakrishnan
Guest Editor

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Keywords

  • high performance computing
  • data-driven approaches
  • machine learning
  • processing
  • structure properties

Published Papers (1 paper)

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Review

15 pages, 5023 KiB  
Review
Modern Powder Metallurgy: Chemical Composition Design for Improved Heat Resistant Alloys
by Igor Razumovskii, Alla Logacheva, Vsevolod Razumovskiy, Ivan Logachev and Mikhail Razumovsky
Metals 2021, 11(8), 1215; https://doi.org/10.3390/met11081215 - 30 Jul 2021
Cited by 2 | Viewed by 2315
Abstract
The modern approach to the design of heat-resistant metal alloys (HRAs) is analyzed, according to which the creep rupture characteristics of an alloy are mostly determined by the strength of interatomic bonding at grain boundaries (GBs) and in the bulk of a matrix [...] Read more.
The modern approach to the design of heat-resistant metal alloys (HRAs) is analyzed, according to which the creep rupture characteristics of an alloy are mostly determined by the strength of interatomic bonding at grain boundaries (GBs) and in the bulk of a matrix phase. The main attention is paid to the concept of “low alloying additions” to polycrystalline alloys with transition metals, because of which the cohesive strength of the GBs and the cohesion energy of the alloy matrix are increased. This approach is especially important in relation to alloys obtained by powder metallurgy, which, in the compacted state, are fine-grained polycrystals. The methodology for calculating the key parameters of the theory (the energy of impurity segregation to the grain boundaries Egb and to the free surface Efs, as well as the values of the partial molar energy of the cohesion of the alloys) from the first principles is given. The results of applying the theory to the study of Ni-, Cr- and Ti-based alloys and the development of new HRAs based on them are presented. Typical defects in the microstructures of objects obtained using additive technologies (AT) and the application efficiency of standard methods of processing powder alloys (Hot Isostatic Pressing (HIP), heat treatment (HT)) to improve the microstructure and increase the mechanical properties are considered. Full article
(This article belongs to the Special Issue Mesoscale Simulations for AM Alloys)
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