STRUCTURE FORMATION DURING SOLIDIFICATION OF TURBINE BLADES CAST IN INVESTMENT PATTERNS
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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An attemp was made to study the peculiarities of structure formation of heat resistant alloys cast under conditions close to those of solidification of cast turbine blades. When smelting alloys such as Ni-Cr-C and Ni-Cr-W-C, the metals W, Mo, Co and Al were introduced in a quantityAMOUNTING TO 5 Ti was added in a quantity amounting to 2. During smelting the alloys were heated to 1450 or 1700 degrees and then poured into hot ceramic molds heated to 950 degrees. Heat treatment involved heating to 1200 degrees. Depending on solidification conditions, the tendency to macrostructural changes depended greatly upon the alloy composition. Common nichromes, and those alloyed with Mo, Co and Al were extremely sensitive to overheat nichrome with an addition of Ti was only slightly sensitive to solidification rate and overheat.