Stainless steel matrix composites reinforced with TiB 2 or TiC particulates have been in situ produced through the reactive sintering of Ti, C and FeB. X-ray diffraction analysis confirmed the completion of reaction. The TiB 2 , TiC and steel were detected by X-ray diffraction analysis. No other reaction product or boride was found, indicating the stability of TiB 2 and TiC in steel matrix. The SEM micrographs revealed the morphology and distribution of in situ synthesized TiB 2 and TiC reinforcements in steel matrix. During sintering the reinforcements TiB 2 and TiC grew in different shapes. TiB 2 grew in hexagonal prismatic and rectangular shape and TiC in spherical shape.