The effect of heat treatment on microstructure and properties of laser-deposited TiC reinforced H13 steel matrix composites

With the development of laser technology, laser processing technology has become increasingly popular in the additive manufacturing, remanufacturing and repairing of hot work molds. Due to the special nature of laser processing technology, it is obviously different from the traditional forging or casting methods, resulting in the need for re-exploration and formulation of the heat treatment process. Therefore, this paper hopes to use laser deposition technology to add hard ceramic phase to prepare H13 steel composites, and to explore the effect of tempering treatment on the microstructure and properties of TiC reinforced H13 steel composites, and to provide theoretical support and practical reference for extending the life of H13 steel. The results indicated that the structure after laser deposition is mainly martensite and fine carbides. With the increase of the proportion of TiC, the structure of the sample becomes more fine and uniform. After tempering,the microstructure of the sample is high-temperature tempered martensite and fine carbides,and the distribution of TiC is more uniform.Compared with untempered amples, the hardness and tensile strength of the sample tempered are lower, but the wear resistance is enhanced.