Influence of sinter-cooling rate on intergranular corrosion of powder metallurgy superaustenitic stainless steel. (October 2014)

• Record Type: Journal Article
• Authors: Martin, F.; García, C.; Blanco, Y.; Herranz, G.
• Is Part Of: Corrosion engineering, science, and technology. Volume 49:Number 7(2014)
• Page Start: 614
• Page End: 623
• Publication Date: 2014-10
• Subjects: Superaustenitic stainless steel, -- Powder metallurgy, -- Polarisation, -- Intergranular corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1179/1743278214Y.0000000165
• Languages: English
• ISSNs: 1478-422X

Abstract

Abstract : Powder metallurgy superaustenitic stainless steel sintered in N2 –H2 atmosphere (95%–5%) was obtained. Three different processes were applied by controlling the sinter-cooling rate (furnace, gas and water). Intergranular corrosion resistance was evaluated. Furthermore, microstructure, density, porosity, macro- and microhardness were investigated. Microstructures were characterised by optical microscopy and scanning electron microscopy with energy dispersive analysis of X-rays. Intergranular corrosion behaviour was evaluated by immersion and by single and double loop electrochemical potentio-kinetic reactivation tests. The superaustenitic steel after fast cooling by water quenching showed the best intergranular corrosion behaviour, the highest microhardness values and the most homogeneous microstructure.