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A 4-kW fiber laser was adopted to weld nano-scale precipitate-strengthened C–Mn steel (NPS steel). Only martensite was found in the fusion zone (FZ), fusion line and coarse-grained heat-affected zone (CGHAZ). The heat-affected zone (HAZ) consisted of both ferrite and martenite/austenite island (M/A island), which were found in both the fine-grained heat-affected zone (FGHAZ) and the mix-grained heat-affected...
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