A combined electron microscopy, atom probe tomography and small angle X-ray scattering study of oxide dispersion strengthened 18Cr ferritic steel

Nagini, M. and Pradeep, K.G. and Vijay, R. and Reddy, A.V. and Murty, B S and et al, . (2020) A combined electron microscopy, atom probe tomography and small angle X-ray scattering study of oxide dispersion strengthened 18Cr ferritic steel. Materials Characterization, 164. pp. 1-9. ISSN 1044-5803

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Abstract

Dispersion of nano Y2O3 (0.35 wt.%) in 18Cr ferritic steel (Fe–18Cr–2.33W–0.34Ti) was achieved by high energy ball milling of pre–alloyed powders after 6 h. The severe deformation induced nano-structuring during ball milling led to metastable solid solution formation, which gets stabilized during consolidation by upset forging and hot extrusion. Transmission electron microscopy, atom probe tomography and small angle X–ray scattering were combined to comprehensively characterize the crystal structure, morphology and the chemical composition of the dispersoids. Accordingly, the dispersoids of the type Y2Ti2O7 with cuboidal shape and Fd3¯m diamond cubic crystal structure having a lattice parameter of 1.01 nm were observed. The plastic deformation behavior of ODS steels at different operating temperatures was studied using the tensile test and the results were correlated with the size and morphology of the dispersoids. © 2020 Elsevier Inc.

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IITH Creators:

IITH Creators	ORCiD
Murty, B S	https://orcid.org/0000-0002-4399-8531

Item Type:

Article

Additional Information:

The authors thank Dr. Ravi Chandra Gundakaram, Dr. K. Suresh, Mr. M. Ramakrishna and Dr. K. Satya Prasad for the help in microstructural characterization. The authors also thank Prof. D. Banerjee, IISc, Bangalore for the help rendered in HRTEM studies. The authors gratefully acknowledge IGCAR , Kalpakkam for funding (No. IGC/MMG/MMD/ODS/01/2010 ) the work and NFC, Hyderabad for carrying out hot extrusion. The authors gratefully acknowledge National Facility for Atom Probe Tomography (NFAPT) funded by DST (No. SR/NM/NS-1041/2016 ) for carrying out APT studies. The authors would like to thank NFAPT project officers Mr. Manu Mathai, Mr. Chandrasekaran and Mr. Srinivasan for their help during FIB sample preparation and APT studies.

Uncontrolled Keywords:

Dispersoids; Mechanical alloying; Microstructure; Oxide dispersion strengthened steel; Tensile properties

Subjects:

Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

20 Oct 2022 14:32

Last Modified:

20 Oct 2022 14:32