Investigation of the Microstructure and Mold Life of Borided AISI 5630 Bims Mold

Abstract

In this study, boriding was investigated on the surface of 5630 steel bims mold by using pack cementation diffusion method. For this purpose, a mixture of Al2O3, B4C and FeW and 10% NaBF4 was used as coating powder, and the AISI 5630 steel surface, which was the substrate material, was coated with the pack cementation diffusion method at 1000 °C for 4 hours and at 950 °C for  4 hours. The successfully obtained coated samples were sectioned and their coating morphologies, thicknesses and microhardness were examined. The phase structures formed on the coating surface were obtained by the X-Ray Diffraction method (XRD) and the Fe2B layer assessed by optical microscope and micro-hardness testing. As a result of the study, the lowest coating thickness was obtained on the sample coated at 950 °C for 4 hours. Although the highest coating thickness was obtained on the sample coated at 1000 °C for 4 hours. As a result of the microhardness analysis, it was observed that the hardness of the coating layer was approximately 5 times higher (2416 HV) than the substrate material.