Issue 68

C. Bleicher et alii, Frattura ed Integrità Strutturale, 68 (2024) 371-389; DOI: 10.3221/IGF-ESIS.68.25

Figure 9: Examples for unetched and etched sections of all investigated materials.

Moreover, Tabs. 6, 7 and 8 provide some examples of fracture surfaces and detailed images. Regardless of the filler and base metals, most of the samples showed failure in the transition area between the filler metal and the base metal. However, there were also samples with failure in the weld filler material, which can be attributed to missing connections within the weld filler material or to delamination or even the occurrence of pores. In some cases, there were also crack-like structures in the weld filler material that favored failure, as shown in Tab. 8 on a sample of EN-GJS-450-18. For the bending samples, the failure mostly started in the transition area between the filler metal and the base one and then continued through the base material, being no longer stopped there. In summary, the transition area can therefore be identified as the main starting point for the failure of the specimens.

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