Dimensional deviation of fillet is an important factor in wax mold preparation

shell preparation and casting solidification in investment casting

which affects the dimensional accuracy of castings. A fillet model with 5 inner chamfers and 1 outer chamfer was designed

and KC3898 NRR wax was used to fill the wax mold and prepareceramic shells.The K423

K424

K438 superalloy castings were poured

and Geomagic Control software was conducted for deviation analysis of fillet radius dimension. The deviation of the fillet radius dimension during the preparation of wax molds is in range of 3% to 30%

and the thermal expansion correction range of the ceramic shell is 2%～8%. Among the three alloys

castings poured by K438 superalloy exhibit the smallest fillet radius dimension deviation.