Embrittlement of molybdenum-rhenium welds under low and high temperature neutron irradiation

被引:19
|
作者
Krajnikov, A. V. [1 ]
Morito, F. [2 ]
Danylenko, M. I. [1 ]
机构
[1] Frantsevich Inst Problems Mat Sci, UA-03680 Kiev, Ukraine
[2] MSF Lab, Keyakidai, Moriya 3020128, Japan
关键词
MO-RE ALLOYS; SPACE-REACTOR APPLICATIONS; REFRACTORY-METAL ALLOYS; 300; DEGREES-C; TENSILE PROPERTIES; RADIATION EMBRITTLEMENT; MECHANICAL-PROPERTIES; INTERGRANULAR FRACTURE; ODS MOLYBDENUM; MICROSTRUCTURE;
D O I
10.1016/j.jnucmat.2013.10.027
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of low- and high-temperature neutron irradiation on the tensile strength, microhardness, and fracture mode has been studied for a series of Mo-Re welds with various Re concentrations. Radiation-induced hardening and concurrent ductility reduction are the key after-effects of neutron exposure. Low-temperature irradiation usually leads to a very hard embrittlement. The hardening effect is rather limited and unstable because of the lack of ductility. Irradiated specimens fail by brittle intergranular or transgranular fracture. The damaging effect of neutrons is less pronounced after high-temperature irradiation. The hardening of the matrix is rather high, but irradiated specimens still keep residual plasticity. High-temperature irradiation intensifies homogeneous nucleation of Re-rich phases, and this effect equalises the difference in mechanical properties between the different weld zones. A characteristic ductility loss exposure temperature was found to separate the temperature fields of absolutely brittle and relatively ductile behaviour. It usually varies between 850 K and 1000 K depending on the alloy composition and irradiation conditions. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:404 / 415
页数:12
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