Equilibrium Structures of Type 304 and Type 316 Stainless Steel in the Temperature Range 800 exp 0 F to 1500 exp 0 F: A Metallographic Review

摘要

The phase diagrams depicted in this report serve as a general guide to the structures that may be found in Type 304 and Type 316 stainless steels as thermodynamic equilibrium is approached. The influences of cold work and stress, however, are not indicated but will tend to cause reactions to proceed more rapidly or to take place where they are not normally favored. A large change in grain size from those shown (ASTM 8-9), will also have an effect on the distribution of the second phases. The proposed mechanism for sigma formation in Type 304 SS requires substantiation with additional experimental evidence over the 1100-1500 exp 0 F temperature range using material containing carbon up to the H-grade level of 1000 ppM. (ERA citation 02:005321)