Abstract
The γ→α transformation and the carbide precipitation in 2Cr and 9Cr steels were investigated by using optical and electron microscopy. In the 2Cr steel, the proeutectoid ferrite was observed at early stages of transformation, while the lamellar structure with α and cementite was observed at later stages around the nose temperature. In the 9Cr steel, the eutectoid structure composed of α and M23C6 were observed from early stages of transformation. Above the nose temperature, α and M23C6 appeared as a lamellar structure. Below the nose temperature, carbides were aligned in ferrite. Factors affecting the rate of the γ→α transformation and the morphology of carbide precipitation are discussed in this paper.
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