Anomalies in properties near phase transformation temperatures
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The anomalous change in dimensions near phase transformation temperatures can be partly fixed by rapid cooling to 20° from A1 +30–40°, i.e., temperatures below standard quenching temperatures.
The main reasons for the contraction are the magnetostriction effect (at temperatures near A1 and Curie temperature) and the change in the thermal expansion coefficient under conditions of low resistance to plastic deformation and high ductility.
The effect is not due to the presence of retained austenite, carbide phase, or stresses.
A special preliminary heat treatment is recommended to reduce changes in volume and linear dimensions during final quenching of parts with a complex shape.
KeywordsCarbide Heat Treatment Austenite Plastic Deformation Ductility
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