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The Effect of Martensite Volume Fraction on the Wear Resistance of Triple phase (Ferritic-Bainitic-Martensitic) Steels

Zarei, Masoud | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52882 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ekrami, Ali Akbar
  7. Abstract:
  8. In this study, the effect of martensite volume fraction on the wear behaviour of 4340 steel with triple-phase steel microstructure with a constant volume fraction of 34% ferrite was investigated. Using the Holman equation, it was found that triple-phase steel with different martensite volume fraction has two stages of work hardening. By increasing martensite volume fraction, yield strength and ultimate tensile strength and work hardening exponent of first and second stages increase and the elongation decreased. To perform the wear test, the pin on disc apparatus was used according to the ASTM G99 standard, and the test was done at two forces of 10 and 50 N at a fixed distance of 400 m. The results showed that as the martensite volume fraction increased, the wear rate decreased due to the increase in work hardening and the presence of the hard martensite structure. Scanning electron microscopy images of the wear surfaces at 10 N showed that the oxidative wear, delamination wear and adhesion wear occurred in almost all microstructures and with increasing force from 10 to 50 N, the mentioned mechanisms intensified, and the wear rate for all of the microstructures increased compared to the 10 N force
  9. Keywords:
  10. Wear Behavior ; Mechanical Properties ; Triple Phase Steel ; Heat Treatment ; Work Hardening

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