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<p>In this study, dissimilar IN718-18Ni300 materials were fabricated using the Cold Metal Transfer (CMT) process. Four deposition strategies were designed: (i) single-pass single-layer deposition (L1); (ii) single-pass double-layer with reciprocating path deposition (L2): (iii) single-pass triple-layer with reciprocating path deposition (L3); and (iv) single-pass double-layer with unidirectional path deposition (L4). The interfacial microstructural evolution and microhardness characteristics of the CMT-fabricated dissimilar metals were systematically investigated. Temperature monitoring results revealed that the peak temperatures increased with the number of deposited layers, while the unidirectional deposition strategy exhibited a higher heat input than the reciprocating deposition strategy. Microstructural and elemental analyses indicated that columnar grains were formed on the IN718 side, accompanied by Nb enrichment at the grain boundaries, whereas the 18Ni300 side mainly consisted of lath martensite. The diffusion width at the interface first increased and then decreased with the increasing number of deposition layers, and the unidirectional deposition exhibited stratification. EBSD analysis showed that an increase in the number of deposited layers led to a larger average grain size from 34.40 to 62.89&#xa0;μm in the interfacial region and higher proportion of high-angle grain boundaries in the BCC-structured 18Ni300 phase. On the IN718 side under unidirectional deposition, the formation of a BCC phase was observed. Increasing the number of deposited layers raised the average hardness of the 18Ni300 side from approximately 257.9 to 312.2 HV, while the hardness of the IN718 and interfacial regions remained largely unchanged. The IN718 side in the unidirectional deposition strategy exhibited higher hardness than that in the reciprocating strategy. Additionally, the formation of the BCC phase on the IN718 side resulted in localized hardness increases in that region. These results indicate that the interfacial diffusion behavior between IN718 and 18Ni300 dissimilar metals in CMT is influenced by both the number of thermal cycles and deposition direction.</p>

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Multiscale regulation of interfacial behavior in CMT of dissimilar IN718-18Ni300 bimetal under different deposition strategies

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Aimin Jiang,
  • Ahmad Baharuddin Abdullah

摘要

In this study, dissimilar IN718-18Ni300 materials were fabricated using the Cold Metal Transfer (CMT) process. Four deposition strategies were designed: (i) single-pass single-layer deposition (L1); (ii) single-pass double-layer with reciprocating path deposition (L2): (iii) single-pass triple-layer with reciprocating path deposition (L3); and (iv) single-pass double-layer with unidirectional path deposition (L4). The interfacial microstructural evolution and microhardness characteristics of the CMT-fabricated dissimilar metals were systematically investigated. Temperature monitoring results revealed that the peak temperatures increased with the number of deposited layers, while the unidirectional deposition strategy exhibited a higher heat input than the reciprocating deposition strategy. Microstructural and elemental analyses indicated that columnar grains were formed on the IN718 side, accompanied by Nb enrichment at the grain boundaries, whereas the 18Ni300 side mainly consisted of lath martensite. The diffusion width at the interface first increased and then decreased with the increasing number of deposition layers, and the unidirectional deposition exhibited stratification. EBSD analysis showed that an increase in the number of deposited layers led to a larger average grain size from 34.40 to 62.89 μm in the interfacial region and higher proportion of high-angle grain boundaries in the BCC-structured 18Ni300 phase. On the IN718 side under unidirectional deposition, the formation of a BCC phase was observed. Increasing the number of deposited layers raised the average hardness of the 18Ni300 side from approximately 257.9 to 312.2 HV, while the hardness of the IN718 and interfacial regions remained largely unchanged. The IN718 side in the unidirectional deposition strategy exhibited higher hardness than that in the reciprocating strategy. Additionally, the formation of the BCC phase on the IN718 side resulted in localized hardness increases in that region. These results indicate that the interfacial diffusion behavior between IN718 and 18Ni300 dissimilar metals in CMT is influenced by both the number of thermal cycles and deposition direction.