Muneo Yaso1, Shuhei Hayashi2, Shigekazu Morito2, Takuya Ohba2, Kunichika Kubota3 and Kouji Murakami4
1Wakou Museum, Yasugi 692-0011
In this paper, the morphologies of martensite and retained austenite for 1.5 mass%C-12 mass% Cr and 1 mass%C-8 mass%Cr steels were observed by means of optical microscopy, XRD, SEM/EBSD and TEM. The amount of retained austenites was quantitatively investigated and compared with XRD, EBSD and TEM observation methods. The retained austenites were distributed in the form of a block type and a film type in the martensite structures. For the 1.5 mass%C-12 mass%Cr steel, the amount of block type retained austenite and film type one are almost equal in three distinct regions of carbide; primary carbide, secondary carbide and without carbide. In the case of 1 mass%C-8 mass%Cr steel, as to film type retained austenite there are not so much differences among those regions. However, block type retained austenites are distributed with much amount, especially in the region around primary carbide.
high carbon-high chromium alloy steel, morphology, crystallography, retained austenite
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