Hard Powder Alloys and Carburized Chromium Steels in the Cr-Fe-C System

 
R.Yakovenko,
 
O.Potazhevskaya,
  

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2013, #01/02
http://www.materials.kiev.ua/article/910

Abstract

Based on analysis of literature data for the Cr-Fe-C system, a Fe–Cr3C2 vertical section is constructed, in which there are wide two-phase fields (αFe) + (Cr, Fe)7C3 and (γFe) + (Cr, Fe)7C3. Sintering of a powder mixture of iron and chromium steels Kh17N2 and Kh13M2 with high chromium carbide is studied and sintering conditions are optimized. It is shown that dissolution of Cr3C2 in the metal matrix of both chromium steels is described with a cascade of phase transformations Cr3C2→ Cr7C3 → (Cr, Fe)7C3 → (Cr, Fe)23C6. The effect of microstructural features and phase constituents on the mechanical properties (bending strength and HRA hardness, impact strength, fracture toughness), tribotechnical characteristics, wear resistance, and corrosion resistance is investigated for the hard alloys and carburized steels Fe–Cr3C2, Kh17N2–Cr3C2, and Kh13M2–Cr3C2. Application of the materials developed allows an increase in the operating life by 7–10 times for working parts of feed mills and high-wear parts of equipment in building industry.


CARBURIZED STEEL, CORROSIVE RESISTANCE, FE–CR–C SYSTEM, HARD POWDER ALLOY, MICROSTRUCTURE, PHASE, WEAR RESISTANCE