Effect of Neutron Irradiation on the Cryogenic Temperature Strength of Electron Beam Welded Joint of High Manganese Steel

Abstract

This paper reports the effect of neutron irradiation on strength of high manganese steel which is a candidate for nuclear fusion reactor components. Cryogenic temperature strengths of two kinds of high manganese steel, A-T (18Mn-6.8Cr-4.7Si) and B-T (22Mn-6.4Cr-4.4Si-0.18N), and their electron beam welded joints were investigated under various irradiated conditions.
Results obtained are summarized as follows.
(1) At cryogenic temperature, high manganese steel A-T exhibited a faint serration, B-T showed a clear serration.
(2) Ultimate tensile strength and 0.2% proof stress of base metal and electron beam welded joint of A-T and B-T increased with increasing of neutron fluence.
(3) Elongation of base metal and electron beam welded joint of A-T and B-T decreased with increasing of neutron fluence.