More and more often cemented carbides employed for the production of wear resistant components have to face highly demanding service conditions, that combine different damage mechanisms. A key example is the range of tetraphasic (sea water, sand, liquid and gaseous hydrocarbons) flows encountered in the Oil&Gas extraction industry. In this study, such an tribochemical condition is simulated in a modified ASTM B611 abrasion testing apparatus, equipped with a three-electrode electrochemical system for in situ electrochemical measurements, enabling the replication of abrasion and corrosion synergistic effects. The effect of the metallic binder content and composition on the behavior of cemented tungsten carbide systems was investigated. The results highlight the role of alloyed binders, where the addition of heavy transition metals (Ru, Hf) is considered. The relationship between the tribological behavior and the mechanical properties of the tested grades is also reported, to support the selection of the grades for each application.
The effect of binder composition on the tribo-corrosion behavior of cemented carbides in simulated tetraphasic flows
Mele C.;Bozzini B.
2020-01-01
Abstract
More and more often cemented carbides employed for the production of wear resistant components have to face highly demanding service conditions, that combine different damage mechanisms. A key example is the range of tetraphasic (sea water, sand, liquid and gaseous hydrocarbons) flows encountered in the Oil&Gas extraction industry. In this study, such an tribochemical condition is simulated in a modified ASTM B611 abrasion testing apparatus, equipped with a three-electrode electrochemical system for in situ electrochemical measurements, enabling the replication of abrasion and corrosion synergistic effects. The effect of the metallic binder content and composition on the behavior of cemented tungsten carbide systems was investigated. The results highlight the role of alloyed binders, where the addition of heavy transition metals (Ru, Hf) is considered. The relationship between the tribological behavior and the mechanical properties of the tested grades is also reported, to support the selection of the grades for each application.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
