Capturing the softening in T91 steel annealed with molten LBE through interfacial gradient plasticity

Wang, Bo; Kaede, Kyoko; Tsurekawa, Sadahiro; Aifantis, Katerina E.

doi:10.1016/j.mtcomm.2023.105719

Capturing the softening in T91 steel annealed with molten LBE through interfacial gradient plasticity

Journal Article · Mon Mar 06 23:00:00 EST 2023 · Materials Today Communications

DOI:https://doi.org/10.1016/j.mtcomm.2023.105719· OSTI ID:2420632

Wang, Bo ^[1]; Kaede, Kyoko ^[2]; Tsurekawa, Sadahiro ^[2]; ^[3]

Univ. of Florida, Gainesville, FL (United States); OSTI
Kumamoto University (Japan)
Univ. of Florida, Gainesville, FL (United States)

In order to study the effect of annealing with molten lead–bismuth eutectic alloy (mLBE) on the mechanical properties of T91 steel, micropillar compression tests were analyzed through the consideration of mechanical interface energy terms within gradient plasticity. The stress–strain curves of the micropillars showed significant stochastic effects, characterized by a different elastic and plastic behavior response for each pillar. Among the various pillars, some exhibited a similar trilinear behavior. Scanning electron microscopy (SEM) images of these specimens demonstrated localized slip deformation and slip planes after compression, while transmission electron microscopy (TEM) images showed the presence of a severe slip zone along the random grain boundaries (RGBs), indicating that the GBs played a dominant role in the deformation/slip. By employing interfacial gradient plasticity that can explicitly account for the presence of GBs, the trilinear response was captured, allowing for the determination of the mechanical interface parameter. As anticipated the pillars which underwent severe slip at the GBs had a lower value for the mechanical interface parameter. Finally, annealing with mLBE can, therefore, in some cases result in softening in the overall stress–strain, as it lowers the mechanical interface energy of GBs.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Japan Society for the Promotion of Sciences (JSPS) (KAKENHI)

Grant/Contract Number:: SC0017715

OSTI ID:: 2420632

Alternate ID(s):: OSTI ID: 1962192

Journal Information:: Materials Today Communications, Journal Name: Materials Today Communications Vol. 35; ISSN 2352-4928

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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