Influence of substructures on the selective laser melted Ti-6Al-4V alloy as a function of laser re-melting

作者：Karimi, J.^*; Xie, M. S.; Wang, Z.^*; Prashanth, K. G.

来源：Journal of Manufacturing Processes, 2021, 68: 1387-1394.

DOI：10.1016/j.jmapro.2021.06.059

• Selective laser melting
• Microstructure
• Substructure
• Twin
• Dislocation density
• Ti6Al4V

This study investigates the effects of melting sequence on the microstructure, substructure, and mechanical properties of SLM Ti6Al4V alloys. Acicular alpha ' martensite was observed in all the SLM samples, and the dimensions of the alpha ' phase were changed with the melting sequence. Twins appear between acicular alpha ' martensite, and a large number of dislocations were observed in the material and within alpha ' martensite. The density of twins and dislocations increased with increasing melting sequence from single melting to triple melting. Tensile strength properties including ultimate tensile strength and yield stress, and hardness increased with increasing melting sequence from single melting to triple melting. The present results clearly prove that the melting sequence plays a significant role in determining the microstructure, substructure, and mechanical properties of the SLM as-built materials.

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