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Title: Yttria-Reinforced Fe-Cr Ferritic Alloy-Based Nanocomposites for Fusion Reactor Structural Applications
Authors: Paul M.J.
Muthaiah V.M.S.
Mula, Suhrit
Published in: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Abstract: Ferritic steel with oxide dispersion strengthening is a promising material for fusion and fission reactor components. In the present study, the influence of Mo, V, and Zr on microstructural evolution, thermal stability, and mechanical properties of yttria-dispersed ferritic Fe-14Cr-1Ti-0.25Y2O3-0.3 wt pct X (X = Mo/V/Zr) steels was investigated. This work is inspired by the concept of MA957 alloy, where Mo was replaced by V/Zr to develop new alloy compositions with possible improvement of thermal stability and mechanical properties through grain refinement and oxide dispersion strengthening. These steels were developed by mechanical alloying (MA) and subsequently consolidated by spark plasma sintering (SPS) at different temperatures (900 °C, 1000 °C, and 1050 °C) in high-purity argon atmosphere. The relative sintered density was found to be ~ 97 to 98 pct for specimens spark plasma sintered (SPSed) at 1050 °C. Microstructural analysis of the SPSed specimens (using scanning electron microscopy/transmission electron microscopy-selected area diffraction (SEM/TEM-SAED)) confirmed the formation of uniformly dispersed Y-Ti-O, TiO, and Ti-Cr-O nanosize complex oxide particles within the ultrafine ferritic matrix grains (~ 200 nm). The nanoindentation hardness value is found to correlate well with the compressive strength and wear resistance of the corresponding batches. The influence of V addition in Fe-14Cr-1Ti-0.25Y2O3 alloy is established to yield better thermal stability and superior mechanical properties (nanoindentation hardness of 16.7 GPa, compressive strength of 3068 MPa) as compared to Mo/Zr-stabilized alloys. This was analyzed and discussed in terms of microstructural evolution and strengthening mechanisms involved in comparison to the Mo/Zr-added steels. © 2021, The Minerals, Metals & Materials Society and ASM International.
Citation: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 52(2): 627-643
Issue Date: 2021
Publisher: Springer
Keywords: Binary alloys
Chromium compounds
Chromium metallography
Compressive strength
Grain refinement
Microstructural evolution
Molybdenum alloys
Molybdenum steel
Nuclear reactors
Scanning electron microscopy
Spark plasma sintering
Strengthening (metal)
Thermodynamic stability
Titanium alloys
Titanium metallography
Titanium oxides
Wear resistance
Yttrium oxide
Argon atmospheres
Microstructural analysis
Nano-indentation hardness
Oxide dispersion strengthening
Selected area diffraction
Sintered density
Strengthening mechanisms
Structural applications
Chromium alloys
ISSN: 10735623
Author Scopus IDs: 57219443500
Author Affiliations: Paul, M.J., Metallurgical and Materials Engineering Department, Indian Institute of Technology Roorkee, Roorkee, 247667, India, School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, 2052, Australia
Muthaiah, V.M.S., Metallurgical and Materials Engineering Department, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Mula, S., Metallurgical and Materials Engineering Department, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Funding Details: The authors greatly appreciate the Metallurgical and Materials Engineering Department and Institute Instrumentation Centre, IIT Roorkee, for providing the facilities and support while we carried out this research work. This research was not supported by any specific grant from any funding agency in either the public, commercial, or not-for-profit sector. Indian Institute of Technology Roorkee, IITR
Corresponding Author: Mula, S.; Metallurgical and Materials Engineering Department, India; email:
Appears in Collections:Journal Publications [MT]

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