Abstract
This study examined the influence of various mold cavities on the reaction and mechanical properties of titanium castings.The width of the 1.5mm-thick material changed from 2.0mm to 4.0mm to 6.0mm or 8.0mm.The thickness of the 4.0mm-wide material changed from 0.5mm to 1.0mm to 1.5mm or 2.0mm.Using Titavest PS as an investing materials, test materials were cast at 600℃.The reaction of titanium castings were examined by hardness test, observation of the microstructure and Computer aided microanalyzer(CMA).Mechanical properties of titanium castings were measured using a three-point flexure test(apparent elastic modulus, 0.03% proof stress and 0.2% proof stress were calculated).From the results of the hardness test, observation of microstructure and CMA, the reaction of titanium castings increased with increases in the mold cavity.Apparent elastic modulus, 0.03% proof stress and 0.2% proof stress decreased with the increases in the mold cavity.The changes caused by increases in the mold cavity were considered to reflect decreases in the percentage of hard layer in the superficial layers of the cast materials.
