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These issues are primarily due to the complex process-microstructure-property (PSP) relationships inherent to AM. Computational models can greatly aid in understanding these relationships, but their widespread impact and adoption has been limited by a lack of validated, open-source, and computationally efficient PSP modeling frameworks and hardware limitations. This study leverages the ExaAM software suite and data from the AMBench-2018 series of laser powder bed fusion (LPBF) benchmark experiments to perform a comprehensive model assessment, including verification, validation, sensitivity analysis, and uncertainty quantification. The RADICAL-EnTK workflow manager was used to perform an ensemble of heat transport, solidification, and mechanical response simulations on the exascale computer Frontier, considering uncertainties in critical model inputs such as laser spot size and nucleation parameters, and consisting of 125 explicit grain structure simulations and 7875 crystal plasticity simulations. For a selected location within the Inconel 625 AMBench-2018 test artifact, sensitivity analysis and uncertainty quantification were performed using the predicted distributions of grain structure and mechanical properties. Qualitative agreement was found between the predicted grain size and texture and the observed AMBench-2018 microstructure, the mean predicted yield stress was within 5% of the experimental measurement mean, and the mean predicted engineering stress at 5% strain was within 10% of the experimental measurement mean. The insights gained from development and validation of the ExaAM PSP modeling framework will help guide future directions for enhancing the credibility and reliability of PSP models in AM, thereby accelerating the adoption of AM technologies in various industries.<\/jats:p>","DOI":"10.1177\/10943420251404105","type":"journal-article","created":{"date-parts":[[2025,12,6]],"date-time":"2025-12-06T05:28:11Z","timestamp":1764998891000},"page":"437-465","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Establishing model credibility for process-microstructure-property relationships in additive manufacturing using exascale computing"],"prefix":"10.1177","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3439-4207","authenticated-orcid":false,"given":"Matt","family":"Rolchigo","sequence":"first","affiliation":[{"name":"Oak Ridge National Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7261-3143","authenticated-orcid":false,"given":"John","family":"Coleman","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4490-2244","authenticated-orcid":false,"given":"Robert","family":"Carson","sequence":"additional","affiliation":[{"name":"Lawrence Livermore National Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2357-7382","authenticated-orcid":false,"given":"Mikhail","family":"Titov","sequence":"additional","affiliation":[{"name":"Brookhaven National Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4250-9476","authenticated-orcid":false,"given":"Samuel Temple","family":"Reeve","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2023-992X","authenticated-orcid":false,"given":"Gerald","family":"Knapp","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alex","family":"Plotkowski","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James","family":"Belak","sequence":"additional","affiliation":[{"name":"Lawrence Livermore National Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3577-3292","authenticated-orcid":false,"given":"Matthew","family":"Bement","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John","family":"Turner","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2025,12,5]]},"reference":[{"key":"e_1_3_5_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.addma.2018.03.021"},{"key":"e_1_3_5_3_1","doi-asserted-by":"publisher","DOI":"10.3390\/met13111846"},{"key":"e_1_3_5_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.addma.2020.101562"},{"key":"e_1_3_5_5_1","article-title":"EnsembleMD toolkit: scalable and flexible execution of ensembles of molecular simulations","author":"Balasubramanian V","year":"2016","unstructured":"Balasubramanian V, Treikalis A, Weidner O, et al. 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