High-Throughput Nanoindentation Mapping of Additively Manufactured T91 Steel

Sau, Moujhuri; Hintsala, Eric D.; Chen, Youxing; Stauffer, Douglas D.; Maloy, Stuart A.; Eftink, Benjamin P.; Lienert, Thomas J.; Mara, Nathan A.

doi:10.1007/s11837-022-05189-0

High-Throughput Nanoindentation Mapping of Additively Manufactured T91 Steel

Journal Article · Thu Mar 03 23:00:00 EST 2022 · JOM. Journal of the Minerals, Metals & Materials Society

DOI:https://doi.org/10.1007/s11837-022-05189-0· OSTI ID:1873342

Sau, Moujhuri ^[1]; Hintsala, Eric D. ^[2]; Chen, Youxing ^[3]; Stauffer, Douglas D. ^[2]; ^[4]; ^[4]; Lienert, Thomas J. ^[5]; ^[1]

University of Minnesota, Minneapolis, MN (United States)
Bruker NANO, Eden Prairie, MN (United States)
University of Minnesota, Minneapolis, MN (United States); University of North Carolina, Charlotte, NC (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
T.J. Lienert Consulting, LLC, Los Alamos, NM (United States)

Here, this work aims to adapt nanoindentation mapping combined with a k-means algorithm as a high-throughput technique to study the nano-scale spatial changes in mechanical properties for a heterogeneous material. This technique can also classify the individual data points based on their properties. Hundreds to thousands of indents were performed on additively manufactured T91 at room temperature, 300°C, 400°C, and 500°C across a square area with a side length of 120 μm to 400 μm. From this data, the hardness and reduced modulus at each point could be calculated and mapped. Using k-means clustering, we were able to arrange the data into three or four clusters corresponding roughly to the ferritic and martensitic phases as well as one or two intermediate clusters sampling both the phases. The hardness of these two phases appears to be quite stable as a function of temperature. Nanoindentation mapping and the k-means algorithm can therefore be used to rapidly assess the feasibility of heterogeneous materials under extreme conditions, such as nuclear reactor steels.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP); Bruker NANO

Grant/Contract Number:: 89233218CNA000001; SC0013218

OSTI ID:: 1873342

Report Number(s):: LA-UR-21-32302

Journal Information:: JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 4 Vol. 74; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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