Vacuum Hot Pressed Novel 21-4N Valve Steel Strengthened by Y-Ti-O Through High-Energy Ball Milling
Source abstract
Abstract
In recent years, the selection of engine valves materials is based on high temperature performance, longer maintenance life, prominent creep and corrosion and oxidation resistance. Typical engine valve includes materials like 21-2N and titanium alloys. In order to develop a more suitable material to enhance its performance, new nanodispersion strengthened austenitic stainless steels were developed with and without the addition of Y2O3, Ti and MnN from ferro-alloys (ferro-manganese, ferro-nickel and ferro-chrome) to obtain Fe-21Cr-4Ni-9Mn-0.5C-0.4Si as the required composition through powder metallurgy route. These pre-alloyed powders in proper proportion were milled mechanically within a planetary ball mill to obtain the required composition and nanocrystalline structure. The milled powders were subsequently vacuum hot pressed at 1200 °C and 60 MPa by maintaining it at a vacuum level of 10−3 mbar for a period of 2 h. Vacuum hot pressed samples were subjected to densification and hardness studies, and microstructural analysis and characterization studies. Density of vacuum hot pressed samples was 97.9% when compared to its theoretical density. With the addition of Y2O3 and Ti as minor alloying elements, very fine austenitic grain structure was formed with the formation of Y-Ti-O complex oxides. The presence of chromium-rich precipitates was revealed during SEM–EDS analysis at the grain boundaries which was attributed due to lower cooling rate of austenitic stainless steel. TEM analysis revealed homogeneous distribution of Y-Ti-O complex oxides within the metal matrix. A marginal increase in hot pressed density was reported with the inclusion of Y2O3 and Ti in the austenitic matrix along with 28% increase in hardness values.
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Research context
OpenAlex topics: Advanced materials and composites · Metal Alloys Wear and Properties · Metal and Thin Film Mechanics
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