Effect of temperature, strain rate and chromium content on the flow behavior of high-manganese steels

Abstract

Compression tests and metallographic observation were conducted to investigate the effect of temperature (400-1100 ℃), strain rate (0.001-10 s-1) and chromium content (0.21-5.44 wt.%) on the flow behavior of high manganese steels for cryogenic application. The results showed that the flow stress reduced with increased temperature and decreased strain rate. The effect of chromium content on the flow stress of steels was not linear. The lowest flow stress was got when the content of chromium was 1.53 wt.%. The influence of strain rate and temperature was obvious while that of chromium content was minor. The maximum flow stress decreased 538 MPa-571 MPa when the temperature rised from 400 ℃ to 1100 ℃ at the strain rate 10 s-1. It ascended 146 MPa-149 MPa when the strain rate increased from 0.001 s-1 to 10 s-1 at 400 ℃. However, the effect of chromium content on the maximum flow stress of steels did not exceed 50 MPa at tested temperatures and strain rates. Dynamic recrystallization (DRX) was observed for all tested steels at 1100 ℃. Higher temperatures and lower strain rates seemed to promote DRX. The true strain required for DRX was the largest when the chromium content in steels was 1.53 wt.%. It delayed the occurrence of DRX.