PSI - Issue 81

Anatolii Klymenko et al. / Procedia Structural Integrity 81 (2026) 470–477

474

Fig. 4. Microsection of Inconel 601 alloy with the measurement results after exposure in lead melt for 240 h (a), 720 h (b) and 1440 h (c) at 650°C.

The micro-x-ray spectral analysis results, including local chemical analysis of the base metal of the alloy and corrosion products with quantitative elemental composition and distribution of chemical elements over the structure, after testing in molten lead at 450 °C and 650 °C, are presented in Fig. 5 and Fig. 6, respectively.

Element, Weight %

O Al

Cr

Fe

Ni

Pb

Spectrum 1 Spectrum 2 Spectrum 3 Spectrum 4 Spectrum 5 Spectrum 6 Spectrum 7

18.61 0.29 10.78 6.08 23.14 41.11

13.94 0.26 15.84 0.29 13.78 0.18 15.05 0.37

5.85 7.13 5.51 6.26

3.82 15.68 60.45 4.92 22.78 49.03 3.98 16.84 59.72 5.04 27.28 46.00

11.21 0.53 14.92 9.21 40.68 23.46

0.58

1.06 24.59 13.80 59.97

-

Element, Weight %

O Al

Cr

Fe

Ni

Pb

Spectrum 1 Spectrum 2 Spectrum 3

22.85 0.51 11.88 3.56

4.25 56.95

7.37 0.48

1.46 19.82 12.46 41.76 17.13

1.41 23.49 14.17 60.44

-

Element, Weight %

O Al

Cr

Fe

Ni

Pb

Spectrum 1 Spectrum 2 Spectrum 3 Spectrum 4

17.29

-

9.01

2.09

3.59 68.01

17.27 0.97 18.94 10.56 49.03 3.22

2.58 4.12

1.24 23.61 13.70 58.88

-

0.98 19.20 10.99 43.88 20.74

Fig. 5. Results of micro-X-ray spectral analysis after exposure of Inconel 601 alloy in molten lead for 240 (a), 720 (b) and 1440 h (c) at 450 °C.

As can be seen in Fig. 5a, at 450 °C and a test duration of 240 hours, the layer of corrosion products contained oxygen and chemical elements of the alloy (iron, chromium, aluminum, nickel), which are almost uniformly distributed over the volume, which is associated with the oxidation of the elements of the Inconel 601 alloy by oxygen dissolved in the lead melt. Since the oxidation products are porous, the lead melt diffuses into the formed oxide voids and thus contributes to the constant removal of the formed corrosion products into its volume and the simultaneous delivery of oxygen for further oxidation of the alloy. In Fig. 5b, after 720 hours of testing, there are almost no corrosion products on the sample, which is due to their chipping off from the surface.