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Journal of Polymer & Composites Original Research Open Access

Characterization of Fracture Toughness of As-Cast Si-Mo- Cr Ductile Cast Iron

  1. Nanak Ram Department of Mechanical Engineering, Delhi Technological University
  2. Vijay Gautam Department of Mechanical Engineering, Delhi Technological University

Abstract

In the present study, a Si-Mo-Cr ductile cast iron is developed by taking three different combinations, viz. Heat-1, Heat-2 and Heat-3 of the selective amount of silicon, molybdenum, copper and chromium. For fracture toughness characterization, the specimens are prepared from the samples in "as-cast" conditions. The value of static fracture toughness obtained from the experiments for the specimen of Heat-2 with a fatigue pre-crack is 54.49 MPa√ , whereas, for the specimens of Heat-1 and Heat-3, the fracture toughness values are 47.52 and 39.48 MPa√ , respectively. The higher static fracture toughness may be attributed to the consistent nodule distribution within the matrix of ferrite and pearlite with lower microshrinkage porosity. According to the results obtained from finite element simulations with a fatigue pre-crack using the experimental data, the simulated results for fracture toughness are found in agreement with the results obtained from the experimental data.

Keywords

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