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Above: A ductile iron quenched from too high an Austenizing temperature. Photo taken in 1984.
Below: 1020C x 1 hr. 180C x ? min. ==> L.B. + M + R. A. Fine black needles are L.B. that was obtained at 180 C. Martensite was obtained while cooling to room temp.
下: 供比對. By 英國劍橋大學 Mr. Asuma. Cambridge Unv. U.K. DIC photo.
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