Abstract
The microstructure evolution, mechanical properties, and tribological properties of high boron cast steel (HBCS) with various Mo concentrations are investigated. The results indicate that Mo addition can significantly modify the microstructure and enhance the comprehensive properties. With the increase of Mo concentration, borides change from the original fish-bone Fe-rich and Cr-rich M2B to dendritic Fe-rich M2B, blocky and cluster-like Cr-rich M2B, and grainy Mo-rich M2B. The hardness of HBCS increases gradually with the increase of Mo content due to the solid solution strengthening and the refinement of M2B. It can be found that all the samples exhibit quasi-cleavage, but the impact toughness increases firstly and reaches the maximum value when the concentration of Mo is 2.10 wt.%, which is the result of the dispersive distribution of M2B rather than the original fish-bone M2B. Subsequently, the impact toughness begins to decrease as the concentration of Mo further increases because of the extensive formation of grainy Mo-rich M2B at the grain boundary. Meanwhile, the wear results reveal that the average friction coefficient and wear ratio decrease with the increase of Mo content, and the wear mechanism changes from abrasive wear and adhesive wear to abrasive wear when the concentration of Mo exceeds 2.10 wt.%.
Highlights
Wear, as one of the most common failure modes of metal materials, has received much attention due to its ubiquity in industrial fields and consequential tremendous economic loss [1,2,3]
The wear results reveal that the average friction coefficient and wear ratio decrease with the increase of Mo content, and the wear mechanism changes from abrasive wear and adhesive wear to abrasive wear when the concentration of Mo exceeds 2.10 wt.%
To improve wear resistance, the wear-resistant materials have undergone a process of evolution from white cast iron, high manganese steel, alloyed white cast iron such as nickel-hard cast iron, and high chromium cast iron (HCCI) to high speed steel (HSS) [6,7,8,9,10]
Summary
As one of the most common failure modes of metal materials, has received much attention due to its ubiquity in industrial fields and consequential tremendous economic loss [1,2,3]. To improve wear resistance, the wear-resistant materials have undergone a process of evolution from white cast iron, high manganese steel, alloyed white cast iron such as nickel-hard cast iron, and high chromium cast iron (HCCI) to high speed steel (HSS) [6,7,8,9,10] Correspondingly, their reinforcing phases have experienced the development from Fe3 C and M7 C3 to MC and M2 C (M represents alloying elements such as Cr, Mo, V, Ni, and W) since, generally speaking, the wear resistance of materials is proportional to the hardness of the materials. It is easy to know that the harder the carbide is, the more expensive metals are needed, which intensely increases the cost of wear-resistant materials [14,15,16]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
