Study on Failure Mechanism in Impact Fatigue of CADI

doi:10.3901/JME.2023.22.312

Abstract

Abstract: Carbidic austempered ductile iron(CADI) is one of the important materials for grinding balls in ball mill due to its excellent mechanical properties. However, the failure mechanism of CADI under impact fatigue is lack of research because the complex phase composition (such as graphite nodules, ferrite, retained austenite and carbides) can affect the performance. The effects of austenitizing temperature, austempering temperature and impact load on CADI impact fatigue cracks are analysed by the modified MLD-10 tester. The sample for impact fatigue is prepared by a self-made tester. The changes of the sample surface and cross section after impact fatigue are studied, and the failure mechanism of CADI impact fatigue is revealed. That is，a large number of impact fatigue cracks are produced due to the deformation of graphite nodules and the fracture of carbides, resulting in the intergranular fracture. Fine graphite balls and carbides with uniform distribution are more conducive to improving the impact fatigue resistance. The high toughness CADI obtained by the super-high temperature pretreatment and austempering treatment is not easy to fracture during the impact fatigue process, which shows that it has broad application prospects.

Key words: CADI, impact fatigue, microstructure, failure mechanism

CLC Number:

TG255

YANG Penghui, FU Hanguang, XU Jianlin. Study on Failure Mechanism in Impact Fatigue of CADI[J]. Journal of Mechanical Engineering, 2023, 59(22): 312-321.

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