Characteristics of microwave melting H13 steel powder with different tungsten contents

Different amounts of tungsten powder (0.07%, 0.4%, 0.6%, 0.8% and 1% on a mass basis) were added to H13 mold steel and the mixtures were microwave sintered. X-ray fluorescence spectroscopy showed tungsten contents of 0.039%, 0.358%, 0.526%, 0.742% and 0.976%, respectively. Under each tungsten load, the standard value of tungsten was lower than expected. The samples showed different degrees of ablation, which was related to the hollow material. Laser-induced spectral analysis showed that the surface composition of the sample was uniform. Furthermore, by using a metallographic microscope, the grain size of the samples was shown to decrease with the increase of tungsten content, which had the effect of refining the grain. A 300-g sample was sintered for 10 min in a microwave at 1300 degrees C, and the Vickers hardness values of the samples were W1: 565.2; W2: 570.6; W3: 572.8; W4: 584.8; W5: 593.2. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

After adding different mass percentages of tungsten powder to H13 mold steel and microwave sintering, the Vickers hardness values of the samples were found to be positively correlated with tungsten content, and the grain size decreased with increasing tungsten content.