Effects of low-temperature neutron irradiation on the microstructure and tensile properties of duplex 2304 stainless steel and its electron-beam welds

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:823

Article

Silva, Chinthaka M.^1,2  Leonard, Keith J.^1,3  Garrison, Lauren M.¹  Bryan, Chris D.¹ 

[1] Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 USA

[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[3] Torch Technol, 6 11th Ave, Shalimar, FL 32579 USA

关键词: Duplex stainless steel 2304;    Low temperature neutron irradiation;    Ferrite;    Austenite;    Chromium nitride;    e-beam welding;   

DOI  :  10.1016/j.msea.2021.141780

来源: Elsevier

【 摘 要 】

A lean duplex stainless steel material (2304-grade) in its base metal and electron beam (e-beam) welded conditions were studied microstructurally and mechanically as a function of irradiation conditions to evaluate its use as a structural material at low temperatures (60-100 degrees C). Neutron irradiation up to a fluence of 1.40 x 10(19) n/ cm(2) (E > 0.1 MeV) or similar to 0.011 dpa decreased the total elongation of both base metal and e-beam welded samples. Overall, radiation hardening was observed in all the samples. The transversely cut irradiated samples showed some nonuniform quasi-cleavage and shearing in their fracture surfaces, indicating the variance of ductile nature of the two-phased (deformable austenite and harder ferrite) duplex structure. The e-beam welded samples also showed quasi-cleavage fracture, which is a characteristic of radiation-induced embrittlement. These observations of the e-beam welded samples were attributed to the formation of coarse ferrites, grain boundary and intragranular phases such as gamma(2) and gamma(3), and minor impurity phases such as CrN and Cr2N in the weld pool and/or heataffected zone of the samples. Radiation-induced elemental segregation was also identified in the post-irradiated base metal.

【 授权许可】

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