Effect of Grain Size Refinement on High Temperature Mechanical Properties in Type 316LN Stainless Steel

摘要

Mechanical tests, such as tensile, fatigue and creep, of type 316L(N) stainless steel containing 0.04 and 0.10 wt percent nitrogen content were conducted at 600 deg C to investigate the grain size effect on the behaviors of mechanical properties since grain size was refined with the addition of nitrogen. Yield strength and fatigue life increased with the addition of nitrogen and the decrease of grain size. The creep rupture time was increased with the addition of nitrogen but decreased with increasing grain size. The change in minimum creep rate with grain size was consistent with the result predicted from Garofalo's equation.