It is known that metal parts can be made stronger, tougher and better wear resistance by introducing gradient microstructure. This work reports the cooling rate of melt pool induced discrepancy in microstructural gradient and element distribution during selective laser melting (SLM), therefore resulting in decrease in microhardness and wear resistance from surface to inside with a range of ~100 µm of SLMmanufactured AlSi10Mg alloy. The cooling rate in the top surface of melt pool

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