PSI - Issue 59

Anatolii Klymenko et al. / Procedia Structural Integrity 59 (2024) 214–221 Anatolii Klymenko et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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which has low adhesion with respect to the metal substrate, the thickness of which increased with an increase in the melt temperature from 450 °C to 650 °C and the exposure time of the samples in the melt (see Tabl e 2).

Table 2. Thickness of corrosion products of the investigated steels. Temperature T, °C Test duration t, h

Corrosion products layer thickness, min.- max. values (average), µm

450

240 720 1440 240 720 1440

10.00-72.00 (39.00) 78.00-98.00 (64.00) 89.00-151.00 (120.00) 184.00-237.00 (210.50) 234.00-409.00 (320.00) 610.00-751.00 (700.00)

650

So, with an increase in temperature from 450 °C to 650 °C, the thickness of the layer of corrosion products (averaged values) increases from 39 to 210 µm after 240 h of testing. With an increase in the test duration from 240 to 1440 h, the thickness of the corrosion products formed layer increases from 39 to 120 µm and from 210 to 700 µm, respectively, at 450 °C and 650 °C (see Tabl e 2). The scanning and optical microscopy results in relation to the nature of the change in the structure and composition of the layers of corrosion products formed on the surface of stainless steel AISI 316L, depending on the duration of tests at 450 °C and 650 °C, are presented in Fig. 3 and Fig. 4, respectively.

Fig. 3. Microsection of AISI 316L steel with the measurement results after exposure in lead melt for 240 h (a), 720 h (b) and 1440 h (c) at 450 °C.

Fig. 4. Microsection of AISI 316L steel with the measurement results after exposure in lead melt for 240 h (a), 720 h (b) and 1440 h (c) at 650 °C.

The XSMA results, including local chemical analysis of the base metal and corrosion products with a quantitative elemental composition and distribution of chemical elements over the structure (mapping) after tests in a lead melt at 450 °C and 650 °C, are presented in Fig. 5 and Fig. 6, respectively.