Alloying and Processing of Medium Manganese Steels for Forging Applications

Abstract The processability of medium Mn-containing steels (MMnS) with 4–10% Mn is discussed in light their continuous casting behavior. Precipitation, phase transformation, extension, or shift solidification intervals induced by various alloying concepts are decisive controlling the hot ductility. It turns out that formation complex AlN and MnS precipitates as well ??ferrite deteriorates high temperature concept MMnS has been used to develop air-hardening forging 4% Mn. alloy design heat treatment parameters have varied a focus on prevention embrittlement fine austenite grains during intercritical annealing. shown addition B Mo increases impact toughness, although effectiveness each element varies depending conditions. toughness can be significantly improved introduction globular metastable austenitic phase. Compared conventional quenched+tempered steels, an cyclic strength for ultimate tensile level more than 1300 MPa achieved.