Effect of preliminary reheating on austenite transformation in the core and hardened case of steel 20Kh2N4A
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Preliminary reheating (1300°C, 2 h) appreciably accelerates transformation of austenite in the upper subcritical temperature range and increases the degree of its transformation in noncarburized melts of both types. This occurs owing to acceleration of ferrite precipitation and an increase of its content.
Reheating of steel does not change the character of austenite transformation in the hardened case, inherent to a given type of melt, and which determines its tendency to form cracks after carburizing.
The structure of the case determines the sensitivity of the melt to the formation of cracks after carburizing. The obtained data once again confirm the conclusion that the structure of the core cannot be such a criterion, since it changes under the effect of high-temperature heating.
KeywordsPrecipitation Ferrite Austenite Hardened Case Austenite Transformation
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