Corrosion and Wear Properties of Cold Rolled 0.087% Gd Lean Duplex Stainless Steels for Neutron Absorbing Material

Abstract

Lean duplex stainless steels with 0.087 wt.% Gd(Gd-DSTSs) were inert arc-melted and cast in molds of size 10 x 10 x 20mm. The micro-hardnesses of the RD, TD and ST directions were 258.5, 292.3 and 314.7 HV, respectively. A 33% cold-rolled specimen had the crystallographic texture that mainly (100) pole was concentrated to ND and (110) pole was concentrated in the center of ND and RD. The corrosion potential and corrosion rate in artificial seawater and 0.1-M H2SO4 solution were in the range of 105.6-221.6 mVSHE, 0.59-1.06 mA/cm2, and 4.75-8.25 mVSHE, 0.69-1.68 mA/cm2 , respectively. The friction coefficient and wear loss of the 0.087 w/o Gd-lean duplex stainless steels in artificial seawater were about 67% and 65% lower than in air, whereas the wear efficiency was 22% higher. The corrosion and wear behaviors of the 0.087 w/o Gd-lean duplex stainless steels significantly depended on the gadolinium phases.