Distribution of dimple sizes on the fracture surface of spheroidized steel in the transition region

✍ Scribed by Bohumír Strnadel; Zdeněk Jonšta

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 763 KB
• Volume: 48
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(94)90193-7

✦ Synopsis

A~~act-Fractography on fractured rU,, pe s cimens of spheroidized steel has revealed a statistical dist~bution of dimple sizes (in the ductile Failure region) dependent on the temperature and distance from the pre-crack tip. The statistical distributions of carbide sizes and dimple sizes conform closely to a Weibutl distribution. The size parameter of the statistical distribution of dimples increases with the distance from the pre-crack tip, but diminishes as the temperature rises. The shape parameter deciines as the distance from the pre-crack tip increases, but grows with the test temperature. The experimentd findings have confirmed a probabilistic theory of void nucleation ahead of the pre-crack tip. The dimpte density on the fracture surface at a certain distance from the pre-crack tip corresponds to the density per unit area of carbides multiplied by the probability of void nucleation.