Microstructure and Mechanical Properties of Ti6Al4V Alloy by Laser Integrated Additive Manufacturing with Alternately Thermal/Mechanical Effects
Received date: 2022-01-11
Revised date: 2022-03-11
Online published: 2022-08-29
Supported by
National Natural Science Foundation of China(52175409);National Natural Science Foundation of China(52175323);Jiangsu Provincial Science and Technology Projects in China(BE2021072);Jiangsu Provincial Science and Technology Projects in China(BE2022069-4)
To meet the requirements of the long fatigue life and high reliability of the key components of the aeroengine as well as solve the challenges of “structure control” and “performance control” based on the fact that plastic deformation can effectively eliminate internal stress and close metallurgical defects generated by the thermal effect, a laser integrated additive manufacturing technology with alternately thermal/mechanical effects is developed. In this study, Ti6Al4V alloy was chosen as the research object. The distributions of residual stress and metallurgical defects and the microstructural evolution of the formed components were systematically studied. The effects of surface laser shock peening (LSP) and interlayer LSP without coating (LSPwC) treatments on mechanical properties were investigated using a tensile test. The results showed that after LSP, tensile residual stress was transformed into compressive residual stress. Additionally, laser shock waves could effectively improve the metallurgical defects in selective laser melting (SLM)-formed components. Moreover, high-density dislocation structures and numerous twins in two directions were produced in coarse α' martensite by laser shock waves, which jointly promoted the grain refinement of α' martensite. The ultimate tensile strength and elongation of Ti6Al4V fabricated by the laser integrated additive manufacturing technology with alternately thermal/mechanical effects reached 1543 MPa and 15.53%, which are 46.5% and 91.5% higher than those of the SLM-formed components, respectively, yielding a good combination of strength and ductility.
Haifei LU , Jiming LV , Kaiyu LUO , Jinzhong LU . Microstructure and Mechanical Properties of Ti6Al4V Alloy by Laser Integrated Additive Manufacturing with Alternately Thermal/Mechanical Effects[J]. Acta Metall Sin, 2023 , 59(1) : 125 -135 . DOI: 10.11900/0412.1961.2022.00011
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