Accession Number : ADA328175

Title :   Microstructural Changes Caused by Thermal Treatment and Their Effects on Mechanical Properties of a gamma/gamma' - delta Eutectic Alloys.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Tewari, Surendra N. ; Dreshfield, Robert L.

PDF Url : ADA328175

Report Date : AUG 1976

Pagination or Media Count : 37

Abstract : Microstructural changes due to thermal treatments of a directionally solidified gamma/gamma' - delta eutectic alloy were investigated. Aging treatments of 8 to 48 hours and ranging from 750 to 1120 deg C were given to the alloy in both its as directionally solidified condition and after gamma' solutioning. Aging resulted in gamma' coarsening, gamma precipitates in delta, and delta and gamma' precipitates in gamma. The tensile strength was increased about 12 percent at temperatures up to 900 deg C by a heat treatment. Times to rupture were essentially the same or greater than for as directionally solidified material. Tensile and rupture ductility in the growth direction of the alloy were reduced by the heat treatment.

Descriptors :   *HEAT TREATMENT, *SUPERALLOYS, TENSILE STRENGTH, SOLIDIFICATION, DUCTILITY, EUTECTICS.

Subject Categories : Properties of Metals and Alloys
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE