Effect of Nitrogen Atmosphere Annealing of Alloyed Powders on the Microstructure and Properties of ODS Ferritic Steels
Agata Strojny-Nędza, Katarzyna Pietrzak, Iwona Jóźwik, Bartosz Bucholc, Edyta Wyszkowska, Łukasz Kurpaska, Agnieszka Grabias, Agnieszka Malinowska, Marcin Chmielewski
TL;DR
This study examines how pre-annealing affects the microstructure and properties of oxide dispersion strengthened ferritic steels used in nuclear applications.
Contribution
The novelty is the analysis of pre-annealing's impact on mechanical and thermal properties of ODS ferritic steels after mechanical alloying.
Findings
Pre-annealing increased the relative density and thermal conductivity of the sinters.
Low electron energy SEM revealed uniform dispersion of reinforcing oxides in the matrix.
Higher Y2O3 content led to increased hardness, Young’s modulus, and nanohardness.
Abstract
Oxide Dispersion Strengthened (ODS) ferritic steels are promising materials for the nuclear power sector. This paper presents the results of a study on the sintering process using the Spark Plasma Sintering (SPS) technique, focusing on ODS ferritic steel powders with different contents (0.3 and 0.6 vol.%) of Y2O3. The novelty lies in the analysis of the effect of pre-annealing treatment on powders previously prepared by mechanical alloying on the microstructure, mechanical, and thermal properties of the sinters. Using the SPS method, it was possible to obtain well-densified sinters with a relative density above 98%. Pre-annealing the powders resulted in an increase in the relative density of the sinters and a slight increase in their thermal conductivity. The use of low electron energies during SEM analysis allowed for a fairly good visualization of the reinforcing oxides uniformly…
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Taxonomy
TopicsOccupational Health and Safety Management · Ergonomics and Human Factors · Ergonomics and Musculoskeletal Disorders