Influence on mechanical properties of hot pressed, solution treated and age hardened 21-4N ODS alloy developed through pre-alloyed powders

Mariappan, R.; Murali, Arun Prasad; Dharmalingam, G.; Prakasham, D. Siva

doi:10.1504/ijmatei.2020.106661

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“…The distribution of dispersoids is usually heterogeneous within the metal matrix when ODS alloys are produced through casting processes [9]. Several researchers have investigated the presence of ODS in iron-chromium-nickel alloys which are the promising material for hightemperature applications [10][11][12][13][14][15][16]. The presence of dispersoids like ODS prevents the movement of dislocations at high temperatures which improve the hightemperature properties and creep resistance [17].…”

Section: Oxide Dispersion Strengtheningmentioning

confidence: 99%

Characterisation and structural transformation of yttria dispersed austenitic steel through VHP

Prasad

Pavithra

Dharmalingam

et al. 2021

Materials Science and Technology

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Two different alloys were developed from the mixtures of pre-alloyed powders consisting of ferroalloys to get the required composition of austenitic stainless steel via the powder metallurgy technique along with the presence and absence of Y2O3. The subsequent mechanical alloyed powders were subject to vacuum hot pressing at 1200°C. The samples were subject to microstructural characterisation post-vacuum hot pressing process. With the addition of yttria, the structure of the grains was fine for the mechanical alloyed vacuum hot pressed samples. The TEM analysis revealed the presence of heterogeneous distribution of yttria particles along the grain boundaries. With the addition of yttria within the metal matrix, the hot pressed density was increased marginally.

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