Development of Fine-Grained Carbide-Particle Hardened Hadfield Manganese Steels: Final Report

摘要

Three Hadfield Manganese (HM) steels containing different carbon concentrations (1.2%C, 1.4%C and 1.7%C) were hot-and-warm worked (HWW). The microstructures developed consist of relatively fine austenite grains (<10 mu m) with spheroidized carbides. The hot-and-warm worked HM steels were then tested in torsion at intermediate and high temperatures (500 to 950/degree/C). Ductility, flow stress, stress-strain relations, and microstructural changes were analyzed as a function of temperature, strain rate, and carbon concentration. The principal factors affecting the torsional ductility of the HM steels were the flow stress during deformation, the temperature, and the carbon content. At intermediate flow stresses, the expected trend of ductility decrease with an increase in flow stress was observed. At low stresses, and high temperatures, however, the ductility was lower than expected due to decarburization. At high stresses, and low temperatures, the ductility was higher than expected due to strain-enhanced transformation to pearlite-spheroidite structures. 8 refs., 19 figs., 2 tabs. (ERA citation 13:034341)