Abstract
Previously isothermal transformation diagrams of four kinds of Si-Mn Steel were determined and the mechanism of the isothermal transformation at various temperature was elucidated. The present research was also carried out, mostly by magnetic analysis, on the decomposition of austenite in the intermediate and martensite transformation ranges; on the influence of holding time at isothermal transformation upon subsequent bainite and martensite transformations during cooling; on the influence of transformation temperature on the transformation process; on the influence of holding time at transformation temperatures on the amount of the residual austenite; and on the influence of holding time at 400° on hardness by micro-hardness measurement. We arrived at the following conclusions; (1) The decomposition of austenite is not completed by isothermal transformation, therefore at the end of transformation a considerable amount of residual austenite remains. (2) The length of holding time of isothermal transformation has the effect of progressively lowering the temperature of the subsequent transformation on cooling. (3) On heating the residual austenite decomposes in two stages at temperatures between 200 and 500°.
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