The paper reports on the influence of porosity and metallurgical defects due to casting on the fatigue behaviour of a ductile iron (EN-GJS-700-2, EN 1563). Fatigue tests were conducted on 40 specimens obtained from machining of bars linked to the casting model. In the bars, casting defects tend to concentrate. X-ray examination, conducted prior to tensile and fatigue testing, allowed for a classification of specimens in two classes (porous and non porous). Few specimens were also scanned through Computed Tomography to gain a more detailed analysis of the porosity level and distribution. Such non-destructive techniques failed to identify metallurgical defects, later observed on the fracture surface, which caused a significant reduction in the specimen fatigue resistance.
Analisi dei difetti di colata e comportamento a fatica di una ghisa sferoidale / Belingardi, Giovanni; Cavatorta, Maria Pia; Doglione, R.. - STAMPA. - (2000), pp. 325-332. (Intervento presentato al convegno XXIX CONVEGNO NAZIONALE AIAS nel 6-9 SETTEMBRE 2000).
Analisi dei difetti di colata e comportamento a fatica di una ghisa sferoidale
BELINGARDI, Giovanni;CAVATORTA, Maria Pia;DOGLIONE R.
2000
Abstract
The paper reports on the influence of porosity and metallurgical defects due to casting on the fatigue behaviour of a ductile iron (EN-GJS-700-2, EN 1563). Fatigue tests were conducted on 40 specimens obtained from machining of bars linked to the casting model. In the bars, casting defects tend to concentrate. X-ray examination, conducted prior to tensile and fatigue testing, allowed for a classification of specimens in two classes (porous and non porous). Few specimens were also scanned through Computed Tomography to gain a more detailed analysis of the porosity level and distribution. Such non-destructive techniques failed to identify metallurgical defects, later observed on the fracture surface, which caused a significant reduction in the specimen fatigue resistance.Pubblicazioni consigliate
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https://hdl.handle.net/11583/1410583
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