Microstructural and mechanical analysis of 316L SS/ β-TCP composites produced though the powder metallurgy route

Abstract

The 316L stainless steel (316L SS) is one of the most used metallic materials for implants, due to its high mechanical properties and low cost. However, it is bioinert. One possibility to improve its biocompatibility is the production of a composite with β-tricalcium phosphate (β-TCP) addition. This study investigated the mechanical behavior of 316L SS/β-TCP composites through powder metallurgy. For this, used were 3 compositions, with 0 %, 5 % and 20 % of β-TCP. The compositions with 5% and 20% were milled during 10 hours with a mass/sphere ratio of 1:10 and 350 rpm. All compositions were uniaxially pressed with 619 MPa and sintered during 1 hour at 1100°C. The microstructural and mechanical evaluations were performed through scanning electron microscopy, density and compressive strength. The results indicated that, by increasing the percentage of β-TCP in the compositions, the mechanical resistance decreases, as a consequence of its low load support.

Obtainment of a new metal matrix composite from the recycling of UNS S31803 duplex stainless steel by powder metallurgy

“…Kuffner et al (2018) investigated the reuse of metallic scraps of AISI 52100 tool steel, and the elastic modulus obtained for the sintered material were of 1.8 GPa (without addition of alumina in the milling process) and 2.5 GPa (with addition of 3% of alumina). In another study, carried out by Faria et al (2018), in which they reused 316L stainless steel, the elastic modulus found was also low, corresponding to approximately 3% of the value of the material as casted. They verified the relationship between porosity and elastic modulus, and concluded that the samples with the highest pore volume were those with the lowest elastic modulus.…”