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Free keywords:
Atom lasers; Explosive bonding; Grain boundaries; Mechanical properties; Nanocrystals; Welding, Atom probe tomography; Carbon distribution; Element distribution; High hardness; Laser-assisted; Medium-carbon steels; Nanocrystallines; Welded steels, Low carbon steel
Abstract:
A melt pocket in the bonding zone of medium carbon steel bonded on low-carbon steel by explosive welding was investigated by laser assisted atom probe tomography. It was found that the structure is nanocrystalline and (sub-) grain boundaries are enriched with carbon. High hardness values in the melt pocket are attributed to a combination of (sub-) grain size and carbon distribution. © 2021