Modified dilatometric technique for determining the austenitizing kinetics of a low alloy Mn-Mo-Ni pressure-vessel steel
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While dilatometry is a powerful technique to study the kinetics of phase transformations, the fact that both the thermal expansion (or contraction) and dimensional changes due to phase transformations are measured simultaneously limits the sensitivity of this method. As the thermal expansion is largely linear, it is possible to compensate for this contribution to the dimensional change of the specimen. A technique based on this approach was developed and used to study the austenitizing kinetics of a low alloy Mn-Mo-Ni pressure-vessel steel. Owing to the increased sensitivity it was possible to establish that austenitizing started at a temperature much lower than the temperature normally assumed to be theAc1. This has implications for the maximum tempering temperature. Possible metallographic evidence for austenitization at a temperature lower than the temperature normally assumed to be theAc1 is presented.
KeywordsPolymer Thermal Expansion Phase Transformation Powerful Technique Dimensional Change
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