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Effect of Heat Treatment on Wear Behavior of High Chromium White Cast Iron

Aalinejad, Davood | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46498 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Varahram, Nasser
  7. Abstract:
  8. It is well known that all crusher tools, which are exposed to wear, must be resistant to both wear and dynamic tensions that can result in catastrophic failures. Tools exposed to heavy tensions should have two opposing properties, which are wear resistivity and toughness. To achieve the best wear resistivity in crusher tools, it is better to have martensitic matrix. During the cooling process, transformation of austenite to perlite occurs and presence of perlite adjacent to carbides extremely reduces the wear resistivity of the work piece. Although because of high solvability of carbon into austenite, stability of austenite in room temperature is possible. Under wear circumstances and absence of impacts, addition of an alloying element that stabilizes the carbon in the form of hard and favorable carbides except cementite, and reduces the carbon of matrix is promising and results in simultaneous improvement of wear resistivity and toughness. Chromium is commonly used as the aforementioned alloying element. Selection of the appropriate heat treatment cycle can control the type of matrix phases and formed carbides, which leads to achievement of appropriate metallurgical and mechanical properties. In the present work the effect of chromium on carbide transformation and the modifying effect of heat treatment cycles on micro-structure are investigated
  9. Keywords:
  10. Wear Resistance ; High Chromium White Cast Iron ; Heat Treatment

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