Combined effects of irradiation and hydrogen on the mechanical and corrosion performances of the ferrite in duplex phase steels

Jiang, Baolong; Liang, Ningning; Xu, Lining; Gao, Lei; Peng, Qunjia; Jiao, Zhijie; Chen, Yongqing; Li, Weiguo; He, Yang; Wang, Luning; Qiao, Lijie

doi:10.1016/j.jnucmat.2022.154069

Cited by 1 publication

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“…These simulation experiments aim to study the impact of irradiated damage on the welded joints. It is well known that irradiation could increase the content of dislocation, voids and precipitates, which further affect the mechanical properties [26,27]. These irradiation-induced defects can enhance the elements' segregation of materials, leading to a synergy of the effects of the irradiation damage [28].…”

Section: Introductionmentioning

confidence: 99%

Irradiation-Assisted Microstructure Evolution and Mechanical Properties Loss of 310S Welded Joints

Jiang

Kan

et al. 2023

Metals

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In order to reveal the effect of irradiation damage caused by high-level liquid radioactive wastes on the welded joint of the container, the irradiation-induced microstructure evolution and mechanical properties degradation of the 310S stainless steel welded joints were investigated in this study. For this purpose, the 1.3 MeV 60Co and 2 MeV accelerators were used to simulate irradiation experiments on 310S welded joints. The uniaxial tensile tests characterized the specimens' mechanical properties and fracture morphology. The results revealed that elongation was reduced by about 5% of irradiation damage by 60Co, and the fracture morphology shows a large number of secondary cracks. In contrast, the elongation was recovered irradiated by the accelerator, and the fracture morphology showed a large number of dimples. Following the interrupted creep deformation, creep fracture tests were conducted for irradiation specimens. The 60Co irradiation damage significantly decreases the creep resistance, leading to deformation of creep, which is increased to 1.5 times that of those unirradiated specimens. At the same time, the ductility is seriously degraded for the irradiated creep fracture specimens. As a result, the creep fracture strain of 60Co specimens is reduced to 70% of that of unirradiated specimens. Further, ductility reduction was related to the irradiated hardening by 60Co, while Nano-indenter hardness was 5.9 GPa, higher by 44% than the unirradiated specimens. The results are shown in an enrichment of Cr, C and P elements at phase boundaries for 60Co irradiation specimens, while the magnitude of element segregation increased by the accelerator combination irradiation. Finally, the creep cracking analysis results show intergranular cracking was observed on the surfaces of the irradiated specimens, while the M23C6 has a primary relationship with the intergranular cracks. The synergic effect of irradiation promoted damage, and element segregation was the primary cause of the intergranular cracking of the 310S welded joints.

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Section: Introductionmentioning

confidence: 99%