Microstructure and Profilometric Analysis of a Gray Cast Iron

  • Zambelli G
  • Haenny L
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Abstract

Classical tensile tests applied to gray cast iron give wide scatter in fracture strength and strain values. Based on the idea that the fracture path depends directly on the micro­ structure, a profilometric analysis of the fracture trace obtained by the intersection of fracture surface and vertical cut was undertaken in an attempt to characterize indirectly the microstructure. Profilometric analyses were made on a continuously solidified gray cast iron with ferrific or pearlitic matrix. The eutectic phase was a combination of two types of graphite (A and D). Optical profilometric measurements were found to exhibit discernable differences between frac­ ture profile parameters for the same type of gray cast iron. Profilometric parameters give a quantitative analyses of the "weak" parts in the microstructure and profilometric deviations are inversely proportional to the initial stiffness defining the microcracking state of the material. A "branching" parameter gives important information about the role of interconnection of the graphitic phase and matrix contribution in the fracture processes. Tensile be­ havior of continuous cast gray iron is greatly influenced by the microscopic scale of microstructure (eutectic cells) and the macroscopic effect (dendrites)

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  • ISSN: 00658375
  • PUI: 13568749
  • SGR: 0020268682
  • SCOPUS: 2-s2.0-0020268682

Authors

  • G. Zambelli

  • L. Haenny

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