Effect of Temperature, Strain rate, Manganese and Carbon Content on flow Behavior of three Ternary Fe-Mn-C (Fe-Mn23-C0.3, Fe-Mn23-C0.6, Fe-Mn28-C0.3) High-Manganese Steels

• Published in: Steel research international 2011-01, Vol.82 (1), p.63-69
• Main Authors: Wietbrock, B., Xiong, W., Bambach, M., Hirt, G.
• Format: Article
• Language: English
• Subjects: Flow stress; high-manganese austenitic steel; hot deformation; Iron; Manganese; Manganese steels; Strain rate; Stress strain curves; Stress-strain relationships; TRIP steel; TWIP steel; Yield strength
• ISSN: 1611-3683; 1869-344X; 1869-344X
• DOI: 10.1002/srin.201000248

In this work compression tests were performed to characterize the flow behavior of three different high manganese austenitic steels (HMS) in dependence of temperature (300–1200 °C) and strain rate (0.1‐10 s−1). True stress‐true strain curves were calculated from the experimental data. Temperature compensation was applied to remove the effects of adiabatic heating. At 300 °C the influence of strain rate is small but rapidly increases with temperature. DRX can be observed above 1100 °C for all HMS with 23 wt% Mn starting from the smaller strain rates. Higher Mn contents seem to promote DRX which occurs first for a 28 wt% Mn steel at 1000°C. While an increasing Mn content decreases the maximum flow stress at smaller temperatures, the opposite is found at temperatures above 700 °C. Carbon influences the stress‐strain curves mainly at temperatures below 700 °C as it raises the maximum stress levels. At temperatures above 1100 °C all three investigated HMS show similar flow curves. By increasing the temperature from 300 °C to 1200 °C the initial flow stresses are reduced by a factor of ten. The maximum flow stress levels are decreased by a factor of eight (Fe‐Mn28‐C0.3), ten (Fe‐Mn23C0.3) and eleven (Fe‐Mn23C0.6).