Abstract

Morphology and Structural Evaluation of Chromium Powder during Mechanical Milling. Chromium plays an important role in improving the high temp oxidation in ODS (Oxide Dispersion Strengthened) alloy due to corrosion resistance. The length of time during mechanical milling of chromium as a dispersion in ferritic steel matrix plays important role. In this study, we investigated the different milling times to understand the microstructure and properties of Chromium powders using Scanning Electron Microscope – Energy Dispersive X-Ray Spectroscopy (SEM-EDS) and X-ray Diffraction (XRD). The results show, as a function of milling time, severe plastic deformation (SPD), and fracture stage occur in the first stage of milling until 3 hours of milling. In 4 until 5 hours of milling, the SPD and cold welding occur. After 5 hours of milling, fracture stage occurs, the shape of particles became smaller and finer. The crystallite size and d-spacing also decrease drastically with milling time.

Highlights

  • Nanostructured ODS alloy is one promising candidate materials in nuclear reactors because of their excellent hightemperature mechanical properties and high irradiation resistance, swelling and their excellent embrittlement [1]

  • Chromium plays an important role in improving the high temp oxidation in ODS (Oxide Dispersion Strengthened) alloy due to corrosion resistance

  • We investigated the different milling times to understand the microstructure and properties of Chromium powders using Scanning Electron Microscope – Energy Dispersive X-Ray Spectroscopy (SEM-EDS) and X-ray Diffraction (XRD)

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Summary

INTRODUCTION

Nanostructured ODS alloy is one promising candidate materials in nuclear reactors because of their excellent hightemperature mechanical properties and high irradiation resistance, swelling and their excellent embrittlement [1]. Chromium plays important role in improving the high temp oxidation in ODS alloy. Particle size plays important role because the powder metallurgy processing technique involving mixing, coalescing, fracturing and remixing powder particles in the high-energy ball. In this process [3] , mixed particles must have not really different particle size. High energy ball- milling is a mechanical powder milling process to reduce the size, the formation of solid-state alloys, mixing two or more material components and changing the shape of particles using a high-energy ball mill. 020081-1 times in the same BPR on its crystallite size, lattice strain and morphology under the high-energy ball milling process to study the structural and phase transformations during the mechanical alloying in high energy ball mill

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