HEAT TREATMENT OF Mn-V-Mo AGE-HARDENING AUSTENITIC STEEL

摘要

The age-hardening characteristics of Mn-V-Mo austenitic steels have been determined as a function of the temperature of the solution treatment. The optimum condition for develop¬ing the full age-hardening potential of an alloy is 1/2 hour at 2100 F followed by a water quench. Subsequent aging treat¬ments required for maximum-hardness levels are: 1 hour at 1400°F, 6 hours at 1300° F, or 16 hours at 1200°F. An aging temperature between 1200 °F and 1300° F is optimum for con¬trolling the balance between yield strength and ductility. The yield strength of metals in the fully-aged condition is directly proportional to Brinell hardness, ranging from 80,000 to 150,000 psi for the compositions investigated.