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Conference Article: Influence of high dose irradiation on structure and fracture of the C0.1-Cr16-Ni15-Mo3-Nb steel

Abstract

Structure evolution of the stainless steel C0.1-Cr16-Ni15-Mo3-Nb in the austenitic state was investigated by the methods of both optics and electron microscopy and electric resistance after its irradiation up to 46 dpa in the BN-350 reactor. The influence of such structural changes on plasticity and character of steel damage at post-irradiation bending test was studied. It was shown that, radiation swelling is the most important structure factor determined physical and mechanical properties of the steel. We determined a quantitative estimate of temperature and irradiation damage dose dependence of both sizes and radiation void density. It was settled that, electric resistance of the steel is determine first of all by swelling value. Influence of other structural changes of the steel (depended on temperature) on electric resistance value was revealed. Plasticity and damage of the steel are determined by radiation void conditions at post-irradiation tests. Damage is occurred on mechanism of void growth and fusion. Estimation of critical swelling and critical void size, when sudden drop of the steel is occurred, was done.

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Reference:

Influence of high dose irradiation on core structural and fuel materials in advanced reactors. Technical committee meeting, Obninsk (Russian Federation), 16-19 Jun 1997

International Atomic Energy Agency, Vienna (Austria)

IAEA-TECDOC--1039, pp:189-196