Abstract
The present work demonstrated the first-ever preparation of block specimens by the microwave sintering of H13 alloy powder. Varying proportions of vanadium powder (1.5%, 2.5%, 3.5%, 4.5%, and 5.5% on a mass basis) were added to H13 mold steel and these mixtures were sintered using microwaves. X-ray fluorescence spectroscopy was employed to determine the compositions of the resulting specimens and vanadium percentages of 1.56%, 2.04%, 3.10%, 4.06%, and 4.20% were determined. These results demonstrate a clear trend, with significantly lower vanadium amounts than expected based on the nominal values at higher vanadium loadings. Different samples were also found to exhibit different degrees of ablation, and this effect was related to the presence of voids in the materials. The surface compositions of these specimens were examined by laser-induced breakdown spectroscopy and were found to be relatively uniform. The microstructures as well as the hardness properties of the materials were assessed. Microwave sintering of 100 g specimens at 1300 °C for 10-min generated samples with hardness values ranging from 205 HV (at the lowest vanadium content) to 175.2 HV (at the highest vanadium content). The wear behavior of samples prepared by microwave sintering H13 die steel with different vanadium contents at room temperature has been studied. The results showed that 1.5% vanadium content is the best mass ratio.
Highlights
Microwaves provide rapid heating that shortens the time and temperature required to sinter various materials, simplifying preparation processes
Zhou et al examined the microwave sintering of a WC-Co fine cemented carbide and compared the results to those obtained with conventional sintering processes [13]
The results showed that the flexural strength, hardness, and magnetic force of the samples were all greatly improved after microwave sintering
Summary
Microwaves provide rapid heating that shortens the time and temperature required to sinter various materials, simplifying preparation processes. Leparoux et al used SiC to enhance the sintering of Al matrix composites in conjunction with the application of microwave energy, and found that both the microwave absorption and heating rate increased with decreases in the SiC particle size [12]. The results showed that the flexural strength, hardness, and magnetic force of the samples were all greatly improved after microwave sintering. We investigated the effects of adding various amounts of vanadium to H13 metal powder in combination with the use of a microwave sample preparation process. The main purpose was to study the effect of microwaves on the composition, microstructure, and properties of bulk materials prepared by microwave sintering alloy powders
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