1979 Volume 48 Issue 12 Pages 1084-1089
Crack propagation features of Stress Corrosion Cracking (SCC) in 42 % MgCl2 solution (143°C) were investigated on welded joints of type 304 stainless steel. Sensitivity of SCC was highest in coarse-grained region of welded joint. This would be caused by the fact that slip ocurred more easily and yield strength was lower in material with coarse grains. In sensitized region by weld thermal cycle, sensitivity for SCC was lower than that of base metal and their fracture surfaces were characterized by transgranular fracture in both of them. The lowest sensitivity was gained in weld metal. This would be caused by so called keying effect of δ phase on SCC, as the weld metal had duplex phases (δ+γ).
