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Crack formation mechanism of slot-milled 50MnVS steel subjected to surface quenching
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DOI：10.1016/j.engfracmech.2026.112517.png)
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Abstract
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• Surface quenching forms a martensitic layer with a hardness of 780 HV. • Crack regions showed finer grains, higher KAM, and increased LAGB fraction. • MnS and Al2O3 inclusions intensified local stress concentration behavior. • Localized MnS accumulations provided preferential crack extension paths. • Fracture stems from a two-stage interaction of slot milling and surface quenching.
Keywords:
50MnVS steel
Crack formation mechanism
Surface quenching
Slot milling
Non-metallic inclusions
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