DEVELOPMENT OF IRON-BASE ABRASION-RESISTANT ALLOYS FOR GAS ATOMIZATION

摘要

For applications under severe abrasive wear conditions cermet powder coatings fabricated by thermal surfacing technologies as well as bulk sintered cermet materials of carbide/metal powder blends are widely used. A cost-saving alternative can be provided by iron-base melt-atomized hard alloy powders. Of these commercial alloys containing high levels of vanadium and carbon give outstanding wear resistance due to their high volume fraction of finely dispersed, hard vanadium carbides. However, their performance is still less than that of cemented carbides. A further improvement of their wear properties basically can be attained by increasing the carbide content, recognizing the limitations of the melting and atomization process. A possible solution can be provided by alloying the basic Fe-V-C system with an additional strong carbide former such as niobium. Hence the subject of this work was to compare the technologically important melting equilibria in the Fe-V-C and Fe-V-C-Nb systems.