Which cracking risk increases during closed-die forging of a high-strength steel component with insufficient die lubrication?

💡 Explanation

Thermal fatigue cracking risk elevates because repeated heating/cooling causes cyclic stress. The lubrication failure exacerbates localized high temperatures, and thermal stress concentrates at surface micro flaws from forging, therefore thermal fatigue crack propagation is more likely, rather than hydrogen embrittlement given short exposure.

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