Diffusive transport parameters of deuterium through China reduced activation ferritic-martensitic steels

Reduced Activation Ferritic/Martensitic (RAFM) steels have been considered as the most promising candidate structure materials for a fusion reactor. In the recent decades, two new types of RAFM steels, called China Low Activation Martensitic (CLAM) steel and China Low-activation Ferritic (CLF-1) steel, have been developed. The gas evolution permeation technique has been used to investigate diffusive transport parameters of deuterium through CLAM and CLF-1 over the temperature range 623 similar to 873 K at deuterium pressure of 10(5) Pa. The resultant transport parameters are: Phi (mol.m(-1) s(-1) Pa-1/2) = 5.40 x 10(-8) exp (-46.8 (kJ.mol(-1))/RT), D(m(2) s(-1)) = 3.81 x 10(-7) exp(-24.0(kJ.mol(-1))/RT) and S (mol.m(-3) Pa-1/2) = 1.42 x 10(-1) exp(-22.8(kJ.mol(-1))/RT) for CLAM; while Phi(mol m(-1) s(-1) Pa-1/2) = 1.76 x 10(-8) exp(-43.9(kJ.mol(-1))/RT), D(m(2).s(-1)) = 1.02 x 10(-7) exp(-16.9(kJ.mol(-1))/RT) and S(mol.m(-1) Pa-1/2) = 1.73 x 10(-1) exp(-27.0(kJ.mol(-1))/RT) for CLF-1. The results show that CLAM is more permeable than CLF-1, thus it is easier for hydrogen isotopes to transport and be removed. (C) 2015 Elsevier B.V. All rights reserved.