Issue 78

A. Sancak et alii, Fracture and Structural Integrity, 78 (2026) 186-206; DOI: 10.3221/IGF-ESIS.78.11

R ESULTS AND DISCUSSION

Temperature-dependent Charpy impact response of the uncorroded reference specimens he temperature-dependent Charpy V-notch impact response of the uncorroded AISI 1008 chain steel was first evaluated at 23, 0, − 20 and − 40 °C. The individual absorbed impact energy values and the corresponding mean values are summarized in Tab. 4. The distribution of the individual measurements and the corresponding mean ± standard deviation values are shown in Fig. 5. Each condition consisted of three specimens. T

Absorbed Energy Specimen 1, J

Absorbed Energy Specimen 2, J

Absorbed Energy Specimen 3, J

Group

Mean ± SD, J

CV, %

1 2 3 4 5 6 7 8 9

60.91 11.76

78.59 19.40

22.19

53.90 ± 28.85 13.37 ± 5.41 5.92 ± 0.72 3.26 ± 0.45 14.23 ± 8.25 17.41 ± 11.26 10.62 ± 5.55 11.02 ± 1.36 19.90 ± 10.00 15.52 ± 10.19 15.30 ± 3.07

53.52 40.45 12.09 13.84 57.94 64.64 52.30 12.31 50.23 65.68

8.95 5.22 3.34

5.89 2.77 8.35

6.65 3.66

23.66 10.78

10.69 30.41 16.95 10.52 12.82

11.05

8.35

6.56 9.99

12.56 31.34 14.63 16.38

15.55 26.13 11.84

10 11

5.80

17.69 20.06 Table 4: Charpy V-notch absorbed impact energy of individual reference and corrosion-exposed specimens.

The uncorroded reference specimens tested at 23 °C exhibited an average absorbed impact energy of 53.90 ± 28.85 J. When the test temperature was reduced to 0 °C, the average absorbed energy decreased to 13.37 ± 5.41 J, corresponding to a reduction of approximately 75.2% relative to the room-temperature reference condition. Further reductions were observed at − 20 and − 40 °C, where the average absorbed energies were 5.92 ± 0.72 J and 3.26 ± 0.45 J, respectively. These values correspond to reductions of approximately 89.0% and 94.0% compared with the 23 °C reference condition. Therefore, the absorbed impact energy exhibited a pronounced temperature-dependent reduction over the investigated temperature range. Because only four discrete test temperatures were examined, the present data were insufficient to determine a ductile-to brittle transition temperature (DBTT).

Figure 5: Charpy V-notch absorbed impact energy of all experimental groups. Bars indicate mean ± standard deviation, and circles indicate individual specimens (n = 3). Group definitions are given in Tab. 2.

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