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Abstract
Abstract In this study, oxide dispersion strengthened (ODS) ferritic steels with nominal composition of Fe–14Cr–2W–0.35Y2O3 (14Cr non Zr-ODS) and Fe–14Cr–2W–0.3Zr–0.35Y2O3 (14Cr–Zr-ODS) were fabricated by mechanical alloying (MA) and hot isostatic pressing (HIP) technique to explore the impact of Zr addition on the microstructure and mechanical properties of 14Cr-ODS steels. Microstructure characterization revealed that Zr addition led to the formation of finer oxides, which was identified as Y4Zr3O12, with denser dispersion in the matrix. The ultimate tensile strength (UTS) of the non Zr-ODS steel is about 1201 MPa, but UTS of the Zr-ODS steel increases to1372 MPa, indicating the enhancement of mechanical properties by Zr addition.
Highlights
In a future environmental friendly energy scenario, the aim of decreasing reliance on fossil fuels has motivated a worldwide interest in advanced nuclear energy [1, 2]
We report a new alloy system based on conventional oxide dispersion strengthened (ODS) steels with Zr addition which were fabricated by mechanical alloying (MA) and hot isostatic pressing (HIP)
It shows that the distribution of the grain size becomes narrower by Zr addition and that the grain size is mainly distributed in the range of 0.2–6.8 μm and 0.1–3.8 μm in non Zr-ODS steel and Zr-ODS steel, respectively
Summary
In a future environmental friendly energy scenario, the aim of decreasing reliance on fossil fuels has motivated a worldwide interest in advanced nuclear energy [1, 2]. The ODS ferritic steel with the nominal composition of Fe–14Cr–2W–0.35Y2O3 (wt%) was prepared by MA, using high-purity metal powders of Fe, Cr, W and Ti in. In order to investigate effects of Zr addition on the microstructure and mechanical properties of ODS ferritic steels, Zr powders (0.3 wt%) in size of micrometer were used. The oxide particles size and composition of the specimens were investigated by transmission electron microscopy (TEM) using a JEM-2010 with an Energy Dispersive Spectroscope (EDS). The SAXS measurements were performed in transmission mode at Shanghai Synchrotron Radiation Facility (SSRF) in BL16B1 beamline to analysis the size and number density distribution of nano-sized oxides in ODS steels. The number density distribution N(r) of oxides with radius r is assumed to have a log normal distribution, which is defined as follows:.
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