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Synopsis: Electron microstructures, precipitates and fracture surface characteristics of Ni—Co—Cr—Fe alloy (Refractaloy 26 type) and Ni—Cr alloy (Inconel X type) for spring at high temperature service are investigated. These alloys that are optimumly aged in order to get superior properties for spring at high temperature services, are observed for the microstructures, precipitates and fracture surface characteristics with transmis—sion electron microscope and scanning electron microscope. Precipitates, which are the cause of precipitation hardening, are diffracted with X-ray. The contents of study are as follows; (1) Effects of aging on the microstructure and precipitate. (2) Relation between the misfit percent of ƒÁ' to matrix and the rate of increase in hardness. (3) Effect of aging on the size of ƒÁ'. (4) The measurement of hardness of the ƒÁ' and matrix at high temperature. (5) Effect of the precipitate on fracture surface characteristics. (Received Mar. 6, 1970)

Microstructures and Charpy Fracture Surface Characteristics of Aged Refractaloy 26 Type Alloy and Inconel X Type Alloy