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Abstract
The effect of solution-treatment (austenitizing) temperature has been investigated on the constitution, transformation, and tempering characteristics of a 9Cr-1 Mo steel. It has been shown that the austenite grain size and phase constitution are markedly influenced by the austenitizing temperature, as also are the transformation characteristics. It has been possible to explain the 15-fold variation in the rate of transformation in terms of the nucleating effect of undissolved carbides or ferrite, and the partitioning of alloying elements to or from the austenite as a function of constitution. Apart from influencing the overall level of hardness obtained on tempering, there was little effect of varying the austenitizing temperature between 900° and 1200°C.
