Abstract
Vanadium carbide (VC) reinforced FeCrVC hardfacings have become important to improve the lifetime of tools suffering abrasive and impact loads. This is because the microstructural properties of such hardfacings enable the primary VCs to act as obstacles against the penetrating abrasive. Because dilution is supposed to be the key issue influencing the precipitation behaviour of primary carbides during surfacing, the development of deposit welding processes exhibiting a reduced thermal impact, and hence lower dilution to the base material, is the primary focus of the current research. By inserting an additional hot wire in the melt, an approach was developed to separate the material and energy input during gas metal arc welding (GMAW), and hence realised low dilution claddings. The carbide content could be increased, and a grain refinement was observed compared with conventional GMAW. These effects could be attributed to both the reduced dilution and heterogeneous nucleation.
Highlights
To improve the wear resistance of tools subject to abrasion and impact, vanadium carbide (VC)reinforced Fe-based hardfacings have become increasingly important
The results demonstrate that an additional hot wire during gas metal arc welding (GMAW) causes an improvement of the
The results demonstrate that an additional hot wire during GMAW causes an improvement of surfacing quality
Summary
To improve the wear resistance of tools subject to abrasion and impact, vanadium carbide (VC)reinforced Fe-based hardfacings have become increasingly important. Nishida et al identified the distance between the hard phases as the primary influencing factor in improving the wear resistance, designated as the mean free path, λMFW [3]. It should be smaller than the mean diameter of the abrasive, dA , in order to achieve the maximum abrasive wear resistance. The aim is to ensure deposition rates of several kilograms per hour and a metallurgical bonding with the base material. In this context, the dilution rate is known to play a key role. Bucheley et al proposed a multi-layer technique to compensate for the influence of dilution on the chemical composition of the melt [7]
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