OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 3 2025 Ta b l e 3 Chemical composition of mixing zones in the transition region when depositing Inconel 625 on 316L stainless steel Point Chemical element, wt.% Fe Ni Cr Ti Mo Nb Si Mn Mode 1 1 35.04 35.15 20.12 0.4 5.27 2.22 0.87 0.94 2 62.4 15.55 19.45 0.77 – – 1.13 0.7 3 67.69 10.73 18.86 0.9 0.27 – 1.11 0.44 4 67.35 11.16 18.82 1.03 – – 1.03 0.61 Mode 2 1 22.32 45.51 21.1 0.24 6.45 2.9 0.75 0.74 2 58.92 17.91 19.23 0.55 1.36 0.5 0.86 0.66 3 68.4 9.9 18.88 0.58 0.29 0.25 0.92 0.79 4 68.13 10.41 18.79 0.42 0.4 – 1.05 0.8 Mode 3 1 22.32 44.94 20.91 0.27 7.36 3.11 0.73 0.31 2 49.3 25.42 18.98 0.58 3.22 1.31 0.67 0.52 3 67.26 11.66 18.28 0.73 0.53 – 0.92 0.61 4 68.51 10.24 18.33 0.58 0.55 0.31 0.97 0.55 a b c Fig. 10. Energy-dispersive X-ray spectroscopy (EDS) analysis results for the Inconel 625 – 316L stainless steel joint: a– mode 1; b – mode 2; c – mode 3 steels [21, 22], in the case of Inconel 625 being deposited onto 316L steel, the transition zone, where ironbased alloys form based on chemical composition, undergoes sequential solidification modes: FA (δ-Fe + γ-Fe), AF (γ-Fe + δ-Fe), and A (γ-Fe) (Fig. 11, regions 1–3). Although nickel atoms have higher mobility in iron, the melting point of 316L steel is slightly higher than that of the nickel alloy, resulting in a relatively narrow transition zone. At the same time, nickel diffusion is sufficiently intense, leading to changes in the chromium-to-nickel equivalent ratios in these areas. The formation of ferrite in the transition layers of the «steel – nickel alloy» system was confirmed by X-ray diffraction analysis (Fig. 12) and scanning electron microscopy (Fig. 13). In regions 4–7 (Fig. 11), nickel-based alloys are formed. Regions 5 and 6 correspond to the original Inconel 625 composition, while regions 4 and 7 are characterized by a reduced nickel content compared to the base alloy. During deposition of steel onto the nickel alloy, the higher processing temperature leads to the formation of a wider transition zone. However, the nickel content in this zone remains relatively high, which ultimately
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