Complexity of segregation behavior at localized deformation sites formed while in service in a 316 stainless steel baffle-former bolt

Lach, Timothy G.; Gussev, Maxim N.; Chen, Xiang

doi:10.1016/j.scriptamat.2024.116371

Complexity of segregation behavior at localized deformation sites formed while in service in a 316 stainless steel baffle-former bolt

Journal Article · Mon Sep 09 04:00:00 EDT 2024 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2024.116371· OSTI ID:2441084

^[1]; Gussev, Maxim N. ^[1]; ^[1]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Here, post-irradiation evaluation was performed on a 316 stainless steel baffle former bolt harvested after 40 years of service in a pressurized water reactor. Microstructure analysis revealed the presence of defect-free dislocation channels and strain-induced twins, indicative of loading at a stress level close to yield stress at least once while in service. Primary radiation-induced Ni/Si precipitates were destroyed during channel and twin formation, and secondary, significantly coarser Ni/Si precipitates formed along newly formed Σ3 boundaries during the continued irradiation. Additionally, an elevated phosphorus level was observed inside the strain-induced twin. Complex chemistry inside the strain-induced feature may overlap with dislocation pileups and impact localized corrosion, material long-term performance, and safety.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain. Advanced Fuel Campaign

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2441084

Alternate ID(s):: OSTI ID: 2440917

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Vol. 255; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Baffle former bolts
In-service radiation
Radiation-induced segregation (RIS)
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Complexity of segregation behavior at localized deformation sites formed while in service in a 316 stainless steel baffle-former bolt

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