Temperature and Dose Dependence of Swelling in 10% and 20% Cold-Worked Type 316 Stainless Steels

Void swelling in 10% cold-worked (10% CW) and 20% cold-worked (20% CW) type 316 stainless steels was investigated by 200 keV C⁺ ion irradiation and transmission electron microscope observation. Both 10% CW and 20% CW 316 steels show the swelling maximum at 923 K. Swelling in 10% CW 316 is much higher than that in 20% CW 316. The voids in the former material are larger and fewer than those in the latter material. The bilinear equation is applicable to describe swelling dose relation for both materials, except 10% CW 3 16 at higher doses than 50 dpa, where sharp swelling increase is observed. Heat to heat variability seems to exist in incubation dose, though it is not large. With regard to swelling rate, all three heats examined show good coincidence for both 10% CW and 20% CW 316 steels. Comparison of 20% CW 316 swelling rate for various irradiation projectiles indicates that the swelling rate is described as a simple function of the projectile mass, and there may exist a scaling law between the different projectile data.