magnetic-materials-2018-posters-abstracts

Page 56

S e p t e m b e r 2 4 - 2 6 , 2 0 1 8 | B u d a p e s t , H u n g a r y

OF EXCELLENCE

IN INTERNATIONAL

MEETINGS

YEARS

Magnetic Materials 2018

Materials Science and Nanotechnology

Volume 2

MAGNETISM AND

MAGNETIC MATERIALS

International Conference on

Mater Sci Nanotechnol 2018, Volume 2

BEHAVIOR OF NANO SIZE DEFECTS IN THE MAGNETIC PROPERTIES

OF RPV STEEL STUDIED BY SMALL ANGLE NEUTRON SCATTERING

MAGNETIC METHODS

Duk Gun Park, KH Kim

and

KM Kim

Korea Atomic Energy Research Institute, South Korea

e-Cu alloys are commonly used for a simulation of radiation damage of RPV steel because a neutron irradiation enhances

the copper precipitates which is known as the primary reason of a RPV embrittlement. An investigation of thermal aged

Fe-Cu model alloy has been a common and adequate alloy for a study of this purpose. For this purpose the selected annealing

temperature is sufficiently low (753K) compare with the solubility limit (e.g. 1023K for Fe-1wt%Cu). The behavior of copper

precipitations in the Fe-Cu alloy which is used as a simulation of radiation damage was investigated using a small angle neutron

scattering (SANS). The alloy was made through a melting with pure Fe and pure Cu. Initially, the alloy is 10% cold rolled, and

isothermally aged at 753 K for 20, 200 and 1800 min. The CRPs sizes, volume fractions and A-ratio of Fe-Cu alloy with aging

time are obtained from the SANS data analysis. The sizes of Cu precipitates nearly constant up to aging time of 200 min and

fast increased, but the volume fraction of Cu precipitates linearly increased with aging time. The investigation is focused on

the behavior of copper precipitates with aging time in the 10% cold rolled Fe-Cu alloy. The objective is to identify the aging time

dependence of precipitates evolution such as volume fraction and size distribution.

Fig.1:

Nuclear (left) and magnetic (right) SANS components as a function of wave-vector transfer Q for the Fe-Cu alloy with 10%

pre-strained measured at room temperature with different aging time at 753K.