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Correlation between Microstructure with Wear and Toughness Properties of Martensitic Stainless Steel

Khaghani, Alireza | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52961 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Pouranvari, Majid; Kokabi, Amir Hossein
  7. Abstract:
  8. Fe-Cr-C hardfacing alloy is the most popular alloy used in severe abrasive condition such as mining and cement industries. One of the limitation of these hardfacing alloys is their low toghness, which reduce the application of these alloys under impact wear conditions. The purpose of this thesis is to investigate the effect of microstructure on the wear and toughness properties of AISI420 hardfaced martensitic stainless steel alloy. For this purpose, after deposition of the hardfaced alloy on a steel substrate, various heat treatments such as quench, quench temper, quench and partitioning and austenite reversion are designed to change the microstructure of the hardfaced alloy from fully martensite to tempered martensite or to reconstituted austenite in the microstructure and these heat treartment are compared with as weld hardfacing alloy. The result of this study showed that the hardfacing alloy under quench temper heat treatment due to high work hardening exponent as well as uniform distribution of carbide particle in the field improved 2.5 times the abrasion resistance. Then the effect of these microstructural changes on the wear properties and toughness of the alloy is investigated. In this way, optimum heat treatment conditions are determined to obtain proper wear and toughness properties. Finally the mechanisms of property improvement due to microstructural change are discussed
  9. Keywords:
  10. Hardfacing ; Wear ; Martensitic Stainless Steel ; Toughness

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