What is the relationship between the various phases in the iron-carbon phase diagram?

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This post was last edited by shuligaoshou on 2020-11-18 at 10:54. 1) At room temperature, the final main structures of steel are pearlite and martensite. The room-temperature structure of low-carbon steel is pearlite, while that of high-carbon steel is martensite. 2) The cementite is very small and cannot be considered the main structure. Based on the level, they are divided into primary cementite, secondary cementite, and tertiary cementite. 3) Ledeburite and modified ledeburite are merely components of martensite. 4) Austenite is merely an intermediate product during the cooling process ； 5) The room-temperature structure of low-carbon steel is pearlite. High-carbon steel also contains pearlite, which is merely an intermediate product during the cooling process. Is the above understanding correct? What other bodies are there?