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.