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In the process of laser additive manufacturing by thermal–mechanical interaction, in addition to the microstructural characteristics (Singh et al. in Mater. Today Adv. 8, 2020;Harun et al. in Powder Technol. 331:74–97, 2018;Singla et al. in J. Mater. Process 64:161–187, 2021;Tan et al. in Int. J. Mach. Tool Manuf. 170, 2021;), the redistribution of residual stresses (Mercelis and Kruth in Rapid Prototyp. J. 12:254–265, 2006;Qiu et al. in Acta Mater. 96:72–79, 2015;) and the evolution of metallurgical defects (Wu et al. in Acta Metall. Sin. 55:811–820, 2019) are also the key factors affecting the mechanical properties of LPBF components. In this chapter, Ti6Al4V alloys are formed by laser additive manufacturing by thermal–mechanical interaction, and the residual stress evolution and redistribution law under the thermal–mechanical interaction are investigated. The physical model of the residual stress distribution under the thermal–mechanical interaction is established. In addition, the defect closure mechanism during laser additive manufacturing by thermal–mechanical interaction is elucidated. Finally, the synergistic strengthening mechanism of residual stress and microstructural characteristics under thermal–mechanical interaction is revealed through tensile experiments.

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Distributions of Residual Stress and Metallurgical Defects of Ti6Al4V Alloy Via Laser Additive Manufacturing by Thermal–Mechanical Interaction

  • 章节

  • 发表日期：

    2025年

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  • Jinzhong Lu,
  • Haifei Lu,
  • Kaiyu Luo

摘要

In the process of laser additive manufacturing by thermal–mechanical interaction, in addition to the microstructural characteristics (Singh et al. in Mater. Today Adv. 8, 2020;Harun et al. in Powder Technol. 331:74–97, 2018;Singla et al. in J. Mater. Process 64:161–187, 2021;Tan et al. in Int. J. Mach. Tool Manuf. 170, 2021;), the redistribution of residual stresses (Mercelis and Kruth in Rapid Prototyp. J. 12:254–265, 2006;Qiu et al. in Acta Mater. 96:72–79, 2015;) and the evolution of metallurgical defects (Wu et al. in Acta Metall. Sin. 55:811–820, 2019) are also the key factors affecting the mechanical properties of LPBF components. In this chapter, Ti6Al4V alloys are formed by laser additive manufacturing by thermal–mechanical interaction, and the residual stress evolution and redistribution law under the thermal–mechanical interaction are investigated. The physical model of the residual stress distribution under the thermal–mechanical interaction is established. In addition, the defect closure mechanism during laser additive manufacturing by thermal–mechanical interaction is elucidated. Finally, the synergistic strengthening mechanism of residual stress and microstructural characteristics under thermal–mechanical interaction is revealed through tensile experiments.