|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||General Poster Session
||O-57: The Effect of Thermal Treatment on Microstructure and Mechanical Properties of Infiltrated TiB2-steel Composites
||Helen Dilman, Or Rahamim, Shmuel Hayun, Nachum Frage
|On-Site Speaker (Planned)
The wetting angle of molten carbon steel (0.7wt.%C) on a TiB2 substrate at 1450°C was found to be adequate (of about 20°) for the fabrication of TiB2-steel composites by free infiltration. Based on results of a thermodynamic analysis of the Fe-Ti-B system the parameters of the infiltration process were determined. TiB2 performs with 27vol% porosity were compacted form mixtures of TiB2 powders with various particles sizes. Infiltration of the preforms with molten 1070 steel was conducted at 1450°C under 10-4 torr vacuum. The infiltrated composites were heat treated at 900°C and quenched in oil. The Young modulus (of about 600GPa) didn’t change after quenching, while hardness value increased form 1500HV to 1800HV for infiltrated and thermal treated composites, respectively. The effect of thermal treatment on the hardness value was attributed to the microstructural changes in steel matrix (form pearlite to martensite).
||Planned: Supplemental Proceedings volume