TiC-reinforced β21 S titanium alloy matrix composites were prepared with electric arc furnace smelting using SiC as the raw material. The influence of the content of SiC（0

0.2% and 0.4%） on microstructure and properties of β-titanium alloy-based composites was analyzed. In addition

the effect of heat treatment on microstructure and properties of deformed composites was also expounded. The results show that in-situ precipitated TiC precipitated presents a slender strip. With the increase of SiC content

the precipitated TiC becomes short. The existence of TiC phase can significantly increase the hardness of the β21 S alloy. When SiC addition is 0.4%

the hardness of the composites reaches 484 HV. After deformation and solution-aging treatment

the elongated TiC phase is decomposed and spheroidized into small granular TiC phases. The dispersed TiC phase can greatly inhibit the formation and movement of dislocations

thereby further increasing the hardness of the β21 S alloy. After solution treatment at 840 ℃ for 20 min and aging at 600 ℃ for 8 h

the hardness of the 0.4% SiC-added composites is increased by 4 times compared with the as-cast state

reaching 2 572 HV.