Grain boundary segregation engineering and austenite reversion turn embrittlement into toughness: Example of a 9 wt.% medium Mn steel

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Segregation assisted grain boundary precipitation in a model Al-Zn-Mg-Cu alloy (2018, background): “orption isotherm, an effect which modifies the grain boundary composition compared to the bulk. Such equilibrium segregation phenomena play an important role for transport and phase 3 transformations [1, 2, 3, 4, 5], as well as for the material’s strength and strain hardening [6], mechanical creep [”
Overview of hydrogen embrittlement in high-Mn steels (2017, background): “However, when austenite is fully stable, excess Mn assists in the intergranular cracking probably because of a reduction in the cohesive energy of grain boundaries [116,117].”
The effects of prior austenite grain boundaries and microstructural morphology on the impact toughness of intercritically annealed medium Mn steel (2017, unknown): “the boundaries is assumed to occur primarily during air cooling at temperatures of below the martensite start (Ms) temperature due to the high mobility of the C atoms [20,39].”