Authors:
Hossein Eskandari Sabzi (1,2), Andrew Hamilton (2), Xinjiang Hao (1), Pedro E.J. Rivera-Díaz-del-Castillo (2)
1- Globus Metal Powders, United Kingdom
2- University of Southampton, United Kingdom
Abstract:
There are significant challenges in the additive manufacturing (AM) of high-performance steels susceptible to transformation-induced plasticity (TRIP) effect. This is a mechanically-induced martensitic transformation of retained austenite distributed in a ferritic or martensitic matrix. Austenite stabilisation and retention at room temperature is of paramount significance to promote TRIP. It was discovered that austenite could be effectively retained due to carbide precipitation during AM. The ultimate tensile strength then increases significantly as a result of this metastable austenite’s gradual transformation into ε-martensite under straining, while exhibiting a high yield strength. The partitioning of stress and strain, which is constantly changing as the hard martensite forms, is the cause of this rise, as revealed by microscopy techniques and X-ray diffraction.
DOI:
https://doi.org/10.59499/EP246228829
