BCC-Fe is the critical and major component of the reactor pressure vessel (RPV) steel. With long-tern neutron irradiation, many point defects can be obtained in RPV steel. In this paper, the points defects (vacancy, interstitial and Frenkel pair) effects on the tensile strength of Fe are studied by molecular dynamics simulations at 300K. The uni-axial tensile load is along \[001\] direction of the Fe samples. The Fe atoms are added or removed randomly to generate point defects. For point defects, three types of point defects can decrease the tensile strength containing yield stress and strain of Fe. In addition, the tensile strength decreases with the increase of point defect concentration. With the same defect concentration, interstitials decrease the yield stress the most seriously compared with the vacancies and Frenkel pairs. Apart from that, the morphology and evolution of the microstructure of Fe with point defects are also investigated under tension. Through dislocation analysis (DXA), both 1/2&lt;111&gt; and &lt;100&gt; dislocations are obtained in the samples with three types of point defects while the pure Fe sample has only 1/2&lt;111&gt; type. Furthermore, the total dislocation length is different in varied defect concentration. In other words, the dislocation length is associated with defect type and concentration. Notably, the results are meaningful to understand the effects of point defects on tensile strength of BCC-Fe.


ICONE Competition - ICONE28-POWER2020-16233: Experimental Investigation of Behavior of Impinging Liquid Jet in a Shallow Pool by 3d-Lif

Division / Sponsors: 
Power Division & Nuclear Engineering Division (NED)

Power Conference
Paper Proceedings: https://asmedigitalcollection.asme.org/POWER/POWER2020/volume/83747

International Conference on Nuclear Engineering
Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE2020/volume/83761

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