In this study, the quantity, size and type of non-metallic inclusions occurring in laser welded transformation induced plasticity (TRIP) and complex phase (CP) steel joints were identified using SEM and EDS techniques. Both steels include Al, Ti, and Si additions which are characterized by high chemical affinity to oxygen. Microscopic observations of the fusion zones of the TRIP and CP steels showed that the quantity and size of inclusions formed in the CP steel were significantly lower than those observed in the fusion zone of TRIP steel. The presence of oxide-type non-metallic inclusions containing Al, Ti and Si has been primarily revealed.Keywords: AHSS, TRIP steel, CP steel, non-metallic inclusions, laser welding
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