ECAP加工されたSUS316L鋼のナノ双晶形成と引張特性に及ぼす熱処理の影響

抄録

SUS316L austenitic stainless steel which was processed by ECAP was annealed at various temperature ranging from 500°C to 800°C to remove dislocations and residual strain. After, the annealing, the sample was processed by second ECAP via Routes A or Bc. In TEM observation of microstructure, 2A and 2Bc samples which were via annealed at 600°C had the highest nano-twined volume. The maximum tensile strength was obtained by insertional annealing at 600°C,and exceeded the strength of the as-ECAPed sample. Uniform elongation was also improved by the insertional annealing, and was maximized at 700°C.Furthermore, we conducted secondary annealing at 600°C after the second ECAP. The secondary-annealed sample showed the uniform elongation which was two time higher than that before the annealing.