Mechanical Alloying Of Nanostructured Saf 2507 Super Duplex Stainless Steel For Novel And Electrochemical Sensor Applications

Abstract

Duplex stainless steels are two-phase alloys containing ferritic austenitic newlinemicrostructure at ambient temperature. The moment it relates to corrosion resistance newlineand strength, duplex stainless steels outperform austenitic stainless steel. During this newlineinvestigation SAF-2507 super duplex stainless steel is used, and includes typically newline25% Chromium, 3.5-4% Molybdenum, and 0.25-0.27% Nitrogen. newlineThe extensively used grades of super duplex stainless steel are 2507 (S32750) and newlineZ100 (S32760). Duplex stainless steel possesses greater yield strength, impact newlineresistance, formability, greater work hardening rate, and low weight and could be newlineused in variety of applications such as chemical reaction vessels, sour gas pipelines, newlineheat exchangers, and cooling pipes. newlineNanomaterials have been of great fascination in recent times owing to their distinctive newlineattributes like enhanced ratio of surface-to-volume, surface and boundary effect, and newlinequantum size effect. Significant phase change will occur when the bulk materials are newlineconverted into nanomaterials. This study attempts to synthesize nano-structured super newlineDSS SAF-2507 by high energy planetary ball-milling. newlineThe high energy planetary ball mill (Retsch PM-100) was utilized to create newlinenanostructured SAF-2507 powders. The powders were then consolidated utilizing newlinespark plasma sintering and cold isostatic pressing for 20 hours. In an argon newlineenvironment, the powders being consolidated at 1200, 1100, and 1000and#8304; C. The newlinepowder compacts density, hardness, and microstructure are examined. SAF-2507 newlinesintered at 1200and#8304; C by cold isostatic pressing exhibited 259HV of Vickers newlinemicrohardness and a sintered density of 90% and the material was sintered by SPS at newline1100and#8304; C temperature exhibited 550HV of Vickers microhardness and a sintered newlinedensity of 96%. The inclusion of 1wt. % Niobium nanoparticles reduced the porosity newlinethereby suppressing the grain development. newlineThe powdered sample was ground to two distinct weight ratios of ball-to-powder, newlinewhich were 5:1 and 10:1 respectively. After ball milling for 20 hours