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THE MARTENSITIC TRANSFORMATION IN AN IRON : 16.5 PERCENT CHROMIUM : 4.5 PERCENT NICKEL ALLOY,
BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH
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Transmission Electron microscopy was used to study the phases and microstructural c8anges produced by various heat treatments in an Fe Cr Ni alloy. Two types of ma9tensite were identified in this system. Needles of b.c.c. alpha - martensite are formed in slowly cooled or quenched specimens. A small number of plates of epislon - martensite are produced by deformation at room temperature. Tempering at temperatures up to 600 C produces a dispersion of the carbide M23C6 in the b.c.c. matrix. Some fa3tors controlling the martensite and austenite in the microstructure are discussed. Author
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