Mechanical Behaviour of Non-Oxide Boride Type Ceramics Formed on The AISI 1040 Plain Carbon Steel

  • Sen, Saduman (Sakarya University, Engineering Faculty, Department of Metallurgical and Materials Engineering 54040 Esentepe Campus) ;
  • Usta, Metin (Rensselaer Polytechnic Institute, Department of Materials Science and Engineering) ;
  • Bindal, Cuma (Sakarya University, Engineering Faculty, Department of Metallurgical and Materials Engineering 54040 Esentepe Campus) ;
  • UciSik, A.Hikmet (Bogazici University, Department of Prostheses, Materials and Artificial Organs, Institute of Biomedical Engineering)
  • Published : 2000.03.01

Abstract

A series experiments were performed to evaluate mechanical behavior of non-oxide boride type ceramics formed on the AISI 1040 plain carbon steel. Boronizing was performed in a slurry salt bath consisting of borax, boric acid, and ferro-silicon at $950^{\circ}C$ for 2-6h. The AISI 1040 steel used as substrate material was containing 0.4%C, 0.13%Si, 0.65%Mn, 0.02%P, 0.014%S. The presence of non-oxide boride type ceramics $Fe_2B $ and FeB formed on the surface of steel was confirmed by metallographic technique and X-ray diffraction (XRD) analysis. The hardness of borides measured via Vickers indenter with a load of 2N reached a microhardness of up to 1800 DPN. The hardness of unborided steel was 185 DPN. The fracture toughness of borides measured by means of Vickers indenter with a load of 10N was about 2.30 MPa.$m^{1/2}$. The thickness of boride layers ranged from 72$\mu\textrm{m}$ to 145$\mu\textrm{m}$. Boride layers have a columnar morphology.

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