Correlative STEM-APT characterization of radiation-induced segregation and precipitation of in-service BWR 304 stainless steel

JOURNAL OF NUCLEAR MATERIALS

卷:549

Article

Lach, Timothy G.^1,2,5  Olszta, Matthew J.¹  Taylor, Sandra D.³  Yano, Kayla H.¹  Edwards, Dan J.¹  Byun, Thak Sang^1,2,5  Chou, Peter H.⁴  Schreiber, Daniel K.¹ 

[1] Pacific Northwest Natl Lab, Energy & Environm Directorate, 902 Battelle Blvd, Richland, WA 99352 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, 1 Bethel Valley Rd, Oak Ridge, TN 37380 USA

[3] Pacific Northwest Natl Lab, Phys & Computat Sci Directorate, 902 Battelle Blvd, Richland, WA 99352 USA

[4] Elect Power Res Inst, 3420 Hillview Ave, Palo Alto, CA 94304 USA

[5] Oak Ridge Natl Lab, Current Address Mat Sci & Technol Div, 1 Bethel Valley Rd, Oak Ridge, TN 37380 USA

关键词: Scanning transmission electron microscopy (STEM);    Atom probe tomography (APT);    Energy dispersive spectroscopy (EDS);    Radiation-induced segregation (RIS);    Stainless steel;   

DOI  :  10.1016/j.jnucmat.2021.152894

来源: Elsevier

【 摘 要 】

Radiation induced segregation and precipitation phenomena in an in-service boiling water reactor 304 stainless steel component were investigated using directly correlated 3D-atom probe tomography and scanning transmission electron microscopy. Significant quantitative differences in measured segregation at grain boundaries were found between the atom probe and energy dispersive spectroscopy measure-ments of the exact same locations. In particular, a much stronger Si segregation (similar to 10 atomic% via atom probe versus similar to 4 atomic% via electron microscopy) and different Cr profile shapes were detected that are critical to models of radiation induced segregation and stress corrosion cracking behavior. These quan-titative differences highlight the need for comparative microscopy and critical evaluation of limitations in each analytical method. Elemental segregation to dislocations and conjoined-clusters were also high-lighted by atom probe; confirming and expanding upon what has been observed in test reactor neutron and accelerator-based ion irradiations. (C) 2021 Published by Elsevier B.V.

【 授权许可】

Free