Effect of vanadium on microstructure and wear resistance of Ni–Cr alloyed cast iron

Abstract

The effect of vanadium content on the microstructure of Ni-Cr alloyed cast iron has been investigated by optical and scanning electronic microscopy and differential scanning calorimetry, aided by thermodynamic calculations of the phase diagrams. The wear resistance of cast and tempered specimens was examined in pin on disc tests. The results show that with increasing V additions, the number of vanadium carbide (VC) precipitates was greatly enhanced and the distribution of precipitates became more uniform. Furthermore, refinement of M 3 C precipitates (M5Fe, Cr, Ni, Mo, V) increased with V addition as a result of heterogeneous nucleation at VC particles. An increase in V content from 0?85 to 4?58 wt-% improved the wear resistance of the cast iron significantly, by a factor of almost 13. Analysis of the microstructure suggests that the refinement of M 3 C and the uniform distribution of dense VC particles account for the improvement of wear resistance of the cast iron. 6 Equilibrium phase mass fraction of Ni-Cr alloyed cast iron with V content of a V1, b V2, c V3 and d V5 calculated by Thermol-Cal software Wu et al. Effect of V on microstructure of Ni-Cr cast iron

Effect of Vanadium on the Solidification and Homogenization Behaviors in Inconel 718 Alloy

“…Hardness has been widely used as a preliminary evaluation of the wear resistance of cast ingot, and thus Brinell hardness (HB) values were obtained to give a tentative estimation of the effect of V on the wear resistance of Inconel 718 alloy cast ingot. As shown in Table , V‐microalloyed samples show slightly higher hardness.…”

Effects of Vanadium on Microstructure and Wear Resistance of High Chromium Cast Iron Hardfacing Layer by Electroslag Surfacing

“…Additions of Nb and Ti can refine the microstructure of the HCCI alloy but cannot increase the content of eutectic M 7 C 3 carbides [14,15]. Studies [16,17] reveal that V can promote the precipitation of secondary carbides during the solid-state phase transformation. Therefore, it is possible that V-alloyed electroslag HCCI hardfacing layer can obtain good wear resistance without post surfacing heat treatment.…”