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We report an efficient method of fabrication of nano-yttria dispersed duplex and ferritic stainless steels by planetary milling of elemental Fe, Cr and Ni powders and their consolidation by spark plasma sintering (SPS). It has been found that addition of yttria nanoparticles not only increases the density, hardness, wear resistance and compressive strength of stainless steels, but also initiates α-Fe to γ-Fe phase transformation. The non-lubricated sliding wear mechanisms of yttria dispersed and yttria free stainless steels against diamond indenter are mainly abrasive with slight oxidative mechanism. The oxidative mechanism is confirmed by energy dispersive spectroscopy analysis of worn surface and wear debris. Maximum compressive stress of yttria dispersed duplex stainless steels was found to be 1,205 MPa and yield stress of 821 MPa.

journal of materials science and engineering. b

Fabrication of Nano-Yttria Dispersed Duplex and Ferritic Stainless Steels by Planetary Milling Followed by Spark Plasma Sintering and Non-Lubricated Sliding Wear Behaviour Study