J. Japan Inst. Metals, Vol. 73, No. 11 (2009),
pp. 852-856

Characteristics of Retained Austenite in Quenched High Carbon-High Chromium Alloy Steels

Muneo Yaso¹, Shuhei Hayashi², Shigekazu Morito², Takuya Ohba², Kunichika Kubota³ and Kouji Murakami⁴

Abstract:

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.

(Received 2009/4/24)

Keywords:

high carbon-high chromium alloy steel, morphology, crystallography, retained austenite

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