Effect of a New Prestrain, Intercritical Annealing, Quenching, and Partitioning Process on the Microstructure and Mechanical Properties of Medium‐Manganese Steels

A new process combining 4% prestrain, intercritical annealing, quenching, and partitioning (prestrain–IA–Q&P) is used to investigate the effect of tensile number on microstructure mechanical properties medium‐manganese steels. microstructural model built based specimens’ properties. The amount tiny brilliant white carbide particles precipitated in seems grow with stretches. test steel's strength first decreases then increases. However, product elongation exhibits opposite trend. improves steel compared IA–Q&P. This might be because multiple stretches have destroyed original steel. Consequently, generated more deformation bands dislocation energy. Simultaneously, grain refinement precipitation increase nucleation point austenite, resulting a diffuse distribution retained austenite. tested stretched numerous times, enhancing capacity microstructure's ferrite/martensite/retained austenite accept dislocations, there increased slip back stress production between microstructures. As result, ductility by transformation induced plasticity synergistic ferrite.