ANALYSIS OF STRESS-STRAIN BEHAVIOR OF TYPE 316 STAINLESS STEEL

摘要

Engineering stress-strain curves of annealed, co ld-worked, and aged type 316 stainless steel were analyzed qualitatively. Atom-defect interactions were related to work-hardening rates and tensile data on the basis of serrations occurring in such stress-strain curves. Three types of serrations have been identified. The effect of varying strain rate was studied by varying crosshead speeds from 0.002 to 2 in./min in room-temperature tests and tests at 650℃. Only at 650℃ had the crosshead speed a significant influence on the ultimate tensile strength and uniform plastic strain;yield strength and elongation values varied little with strain rate. The effect of test temperature ranging from 450 to 650℃ was studied on as-annealed, annealed and aged, 20％ cold-worked, and cold-worked and aged specimens. Specimens aged for 4000 hr were tested at their aging temperatures. Long-term aging at 450 and 550℃ had little or no effect on mechanical-property data of as-annealed specimens, but affected those of previously cold-worked specimens measurably.