Numerical simulation on the stress field of austenite stainless steel during twin-roll strip casting process

The specimens were taken from the 304 austenite stainless steel. Based on the measured results of the phase transformation temperature and phase structure curves of the 304 stainless steel, the finite element model was established. According to the simulated temperature field of 304 stainless steel during twin-roll strip casting process and the mechanical properties of 304 stainless steel determined, the stress field of the 304 stainless steel during twin-roll strip casting process was simulated. Meanwhile, the effect of different technologic parameters, such as casting speed, casting temperature, roller radius and strip thickness at the exit, on the stress field of the 304 stainless steel during twin-roll strip casting process was simulated too in this work. The results show that the largest tensile stress appears on the contact interface between strip and roller located 5–10° away from exit. The tensile stress appears on the surface and the compressive one in the center of the strip. The larger roller radius and strip thickness at the exit are, the larger the tensile stress on the surface of 304 stainless steel during twin-roll strip casting process is. However, the larger the casting speed and the casting temperature are, the smaller the tensile stress on the surface of 304 stainless steel is.

The thermal elastic-plasticity model of the stress field above the exit was established. Near the exit, the maximum tensile stress occurs at the contacted surface position about 5–10°. The stress fields of 304 stainless steel with different technologic parameters were simulated.