Microshrink, Tensile Properties, and the Detection of Microshrink.
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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The unknown effects of microshrink on the tensile properties of cast nickel-base alloys were investigated. The objectives of this investigation were to study the effect of microshrink on the tensile properties of nickel alloy 713C and to find nondestructive methods of detecting microshrink at any significant level. Alloy bars were cast, the microshrinkage was measured metallographically, and tensile tests were run at 1000 F. A large number of sources were searched for information on methods to detect microshrink. Within the range of 2.5 to 9, measured in the local area having the greatest amount present, microshrink did not have any significant effect on tensile properties. A number of methods to detect microshrink nondestructively were found, but those other than conventional X-ray radiography would require development. The effect of microshrink on fatigue and creep properties was not investigated. Consideration should be given to making such an investigation of these effects. Keywords High temperature alloys Casting Metallography Nickel alloys. Author.