TY  - JOUR
AU  - Kobayashi, Satoru
AU  - Gillemot, Ferenc
AU  - Horváth, Ákos
AU  - Horváth, Márta
AU  - Almásy, László
AU  - Tian, Qiang
AU  - Feoktystov, Artem
TI  - Investigation of effects of long-term thermal aging on magnetization process in low-alloy pressure vessel steels using first-order-reversal-curves
JO  - AIP Advances
VL  - 7
IS  - 5
SN  - 2158-3226
CY  - New York, NY
PB  - American Inst. of Physics
M1  - FZJ-2017-07522
SP  - 056002 -
PY  - 2017
AB  - We have investigated effects of long-term thermal aging at 550°C up to 10000 h on major-loop coercivity, hysteresis scaling of minor loops, and first-order reversal curves (FORCs) for low-alloy pressure vessel steels with low and high Ni contents. While major-loop coercivity and minor-loop coefficient of the scaling exhibit a gradual decrease with aging for high-Ni steel, those for low-Ni one are very weakly dependent on aging time. On the other hand, we found that FORC distribution becomes steep along both axes of interaction and switching fields and the peak shifts toward a lower switching field for both steels. Considering that there is no significant development of nanoscale precipitates during the aging as revealed with small-angle neutron scattering experiments, a relaxation of lattice strain in a matrix, possibly associated with diffusion of Ni atoms, may dominate magnetic properties at 550°C
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000402797100159
DO  - DOI:10.1063/1.4973605
UR  - https://juser.fz-juelich.de/record/839945
ER  -