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<p>IN718 alloy was fabricated by plasma arc additive manufacturing (PAAM), and the influence of the scanning strategy on the microstructure and mechanical properties of the PAAM IN718 alloy was explored. The results show that the PAAM IN718 alloy fabricated with standard scanning strategy (SS) exhibits a strong directional growth of the Laves phase in the cross section. The parallel scanning strategy (PS) effectively regulates the heat flow direction, disrupts the growth direction of Laves phase, and produces a zigzag variation in the maximum heat flux density at approximately 55° to the building direction, generating the random occurrence of columnar dendrites, cellular dendrites, and equiaxial dendrites in PAAM IN718 alloy. The as-built alloy exhibits inferior strength and elongation due to the absence of the γ″ phases and the coarse Laves phase. Following full heat treatment, the tensile strength of the PAAM alloys reaches 1144&#xa0;MPa (SS mode) and 1272&#xa0;MPa (PS mode), with the latter showing an 11.2% increment attributed to refined Laves phase and disordered growth orientation. This is attributed to the refined Laves phase and the dispersed γ″, which hinders the dislocation motion. The strength increments caused by the Laves phases are 25.2-45.8&#xa0;MPa for SS mode alloy and 59.8-126.4&#xa0;MPa for PS mode alloy, respectively. The superior mechanical properties of PS alloy are caused by the disordered orientation of the Laves phase. Both scanning strategies result in ductile fracture of the PAAM alloy. Moreover, regulating the Laves phase by scanning strategy can reduce the stress concentration and the tendency of crack nucleation and propagation. In summary, the microstructure and mechanical properties of the PAAM IN718 alloy can be effectively optimized by reasonably adjusting the plasma arc scanning strategy.</p>

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The Influence of Scanning Strategy on the Microstructure and Mechanical Properties of IN718 Alloy Fabricated by Plasma Arc Additive Manufacturing

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Wenqing Niu,
  • Xuanru Chen,
  • Wenmin Ou,
  • Yuqiang Han,
  • Yaocheng Zhang

摘要

IN718 alloy was fabricated by plasma arc additive manufacturing (PAAM), and the influence of the scanning strategy on the microstructure and mechanical properties of the PAAM IN718 alloy was explored. The results show that the PAAM IN718 alloy fabricated with standard scanning strategy (SS) exhibits a strong directional growth of the Laves phase in the cross section. The parallel scanning strategy (PS) effectively regulates the heat flow direction, disrupts the growth direction of Laves phase, and produces a zigzag variation in the maximum heat flux density at approximately 55° to the building direction, generating the random occurrence of columnar dendrites, cellular dendrites, and equiaxial dendrites in PAAM IN718 alloy. The as-built alloy exhibits inferior strength and elongation due to the absence of the γ″ phases and the coarse Laves phase. Following full heat treatment, the tensile strength of the PAAM alloys reaches 1144 MPa (SS mode) and 1272 MPa (PS mode), with the latter showing an 11.2% increment attributed to refined Laves phase and disordered growth orientation. This is attributed to the refined Laves phase and the dispersed γ″, which hinders the dislocation motion. The strength increments caused by the Laves phases are 25.2-45.8 MPa for SS mode alloy and 59.8-126.4 MPa for PS mode alloy, respectively. The superior mechanical properties of PS alloy are caused by the disordered orientation of the Laves phase. Both scanning strategies result in ductile fracture of the PAAM alloy. Moreover, regulating the Laves phase by scanning strategy can reduce the stress concentration and the tendency of crack nucleation and propagation. In summary, the microstructure and mechanical properties of the PAAM IN718 alloy can be effectively optimized by reasonably adjusting the plasma arc scanning strategy.