Effect of heat treatment at 1,150 C on creep rupture properties of a Fe{sub 3}Al-based alloy | Zendy

C.G. McKamey | Zendy; P.J. Maziasz | Zendy; Y. Marrero-Santos | Zendy

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Effect of heat treatment at 1,150 C on creep rupture properties of a Fe{sub 3}Al-based alloy

Author(s) -

C.G. McKamey,

P.J. Maziasz,

Y. Marrero-Santos

Publication year - 1994

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/52848

Subject(s) - creep , materials science , microstructure , alloy , metallography , grain boundary , coalescence (physics) , scanning electron microscope , power law , optical microscope , metallurgy , activation energy , grain size , composite material , chemistry , physics , statistics , mathematics , astrobiology

The effects of heat treatment at 1,150 C on the creep-rupture properties of a Fe{sub 3}Al-based alloy were studied. Tests were conducted in air using various test temperatures and stresses. By plotting the data to a power-law equation, the activation energy for creep was determined to be approximately 150 kcal/mole and the creep exponent to be about 8. Optical metallography and scanning electron microscopy of ruptured specimens indicated that failure was in a ductile manner by microvoid coalescence at grain boundaries and triple points. Analytical electron microscopy was used to study characteristics of the microstructure and to identify Zr-rich precipitates that formed during heat treatment or creep testing. These precipitates were found to provide strengthening by pinning dislocations and grain boundaries

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