The Effect of Processing Parameters of Borosiliconizing Treatment in H11 Hot Work Tool Steel

In this study، a borosiliconized protective coating was deposited on H11 steel using the pack cementation method. The effect of processing parameters on the formation and growth of borosilicon layers was investigated at different conditions، i. e. the temperatures of 1000 °C and 950 °C for 3 and 6 hours، respectively. The layers were characterized by means of optical and scanning electron microscopes and X-ray diffraction in terms of their morphology and different phases formed during the treatment. Two distinct regions were found in the coatings consisting of a compound region and a diffusion layer containing undissolved carbides. The hardness numbers were in the range of 500 to 700 HV. An increase in the process temperature and time showed an effect on the formation of undissolved carbides.