Husinec, Czech Republic
Husinec, Czech Republic

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Hojna A.,Centrum Vyzkumu Rez CVR | Di Gabriele F.,Centrum Vyzkumu Rez CVR | Klecka J.,Centrum Vyzkumu Rez CVR
International Conference on Nuclear Engineering, Proceedings, ICONE | Year: 2014

This work summarizes results of the work carried out in CVR (Centrum výzkumu Rez) on the evaluation of the susceptibility to LME (Liquid Metal Ebrittlement) of the ferritic/martensitic steel T91 in contact with LBE (Lead-Bismuth Eutectic) at 300 and 350°C. The work, carried out in the past few years, through tensile and fracture toughness tests, revealed a marked sensitivity to embrittlement for the T91 in contact with LBE. Tests were carried out in well defined conditions and according to ASTM standards. It was observed that the LBE decreased the fracture toughness, JIC, by more than 30%, compared to the value in air. The results are discussed based on examinations of the fracture surface evidencing LME occurrence. The fracture toughness measured in LBE is proposed to be the appropriate value for fracture resistance evaluation, applied to extension of a pre-existing LME crack. Copyright © 2014 by ASME.

Klecka J.,Centrum Vyzkumu Rez CVR | Di Gabriele F.,Centrum Vyzkumu Rez CVR | Hojna A.,Centrum Vyzkumu Rez CVR
Nuclear Engineering and Design | Year: 2015

Interaction of the steel T91 with the liquid Pb, issue of main concern for LFR, has been studied. The experimental cell CALLISTO was designed and manufactured in the aim of carrying out mechanical testing of materials immersed in the liquid metal to study sensitivity to Liquid Metal Embrittlement, LME. Several tensile tests were carried out in CALLISTO, with Pb. Experimental variables considered were the surface state and the temperature. When testing notched specimens and inducing wetting, it was observed that loaded specimens showed the typical features of the embrittlement induced by LM in their fracture surfaces. Results are discussed in terms of effect of the environment on the mechanical properties of the steel T91 and the brittle features observed in the fracture surface. © 2014 Elsevier B.V. All rights reserved.

Hojna A.,Centrum Vyzkumu Rez CVR | Di Gabriele F.,Centrum Vyzkumu Rez CVR | Klecka J.,Centrum Vyzkumu Rez CVR | Burda J.,UJV Rez
Journal of Nuclear Materials | Year: 2015

This work deals with the interaction between liquid lead and the ferritic-martensitic steel, T91. Mechanical properties of specimens loaded in contact with liquid lead were tested in laboratory and boundary conditions necessary to ascertain the sensitivity to Liquid Metal Embrittlement (LME) were studied. Three effects, temperature, deformation rate and surface treatment were selected to stimulate the LME initiation on smooth tensile specimens, then the notch effect was selected as an additional factor. Some specimens were pre-treated by application of a flux followed by dipping into liquid lead to simulate wetting. Slow strain rate tests (SSRT) of specimens immersed in liquid lead were performed applying strain rates from 10-2 to 10-8 1/s from 350° to 450°C in test cell CALLISTO. Two types of tensile specimens were tested, smooth and notched. After tests, the fracture mode and the status of specimen surface was examined. Results of the specimens immersed in lead were compared with the results obtained in air. The most significant was the strain rate effect on the stress-strain curves of smooth specimens. Moreover, while no LME was observed for the smooth specimens, clear evidence of LME was observed for the notched specimens. © 2015 Elsevier B.V. All rights reserved.

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