This paper focuses on the structure and mechanical properties of powder metallurgy stainless steels
(Fe–Cr–Mn–Mo–Si–N–C) developed for biomedical applications. The samples were prepared by mechanical
alloying and subsequent liquid-phase sintering with a eutectic Mn–Si alloy additive. By changing the
sintering aid content, the pore configuration, compressive strengths, and impact properties of the samples
were assessed. The Rietveld X-ray diffraction analysis showed after sintering at 1050 C for
60 min followed by water-quenching, a nanocrystalline austenitic structure was formed in the material.
According to the mechanical experiments, by increasing the additive content from 0 wt% to 6 wt%, sintering
densification, yield stress, compression strength, and absorbed impact energy were improved, where
spoiling occurred when adding 8 wt% additive. Also, as realized from the impact fracture surface features,
despite the presence of some unmelted additive particles, the role of the pore elimination in toughness
prevailed over that of these particles.