Abstract
Experimental results indicate that the volume fraction of the carbide phase, carbide size and distribution had an important influence on the wear resistance of Fe-CrC-V alloys under low-stress abrasion conditions. Besides, the martensitic or martensiteaustenitic matrix microstructure more adequately reinforced the M7C3 eutectic carbides, minimizing cracking and removal during wear, than did the austenitic matrix. The secondary carbides which precipitate in the matrix regions of high chromium iron also influence the abrasion behaviour. The results of fracture toughness tests show that the dynamic fracture toughness in Fe-Cr-C-V white cast irons is determined mainly by the properties of the matrix. The high chromium iron containing 1.19 wt.% V in the as-cast condition, showed the greater dynamic fracture toughness when compared to other experimental alloys. The higher fracture toughness was attributed to strengthening during fracture, since very fine secondary carbide particles were present mainly in an austenitic matrix. In heat treated Fe-Cr-C-V alloys with varying contents of vanadium, lower Kid values were obtained, compared with as-cast alloys.
Highlights
High chromium white cast irons are an important class of wear resistance materials currently used in a variety of applications where stability in an aggressive environment is a principal requirement, including the mining and mineral processing, cement production, slurry pumping and pulp and paper manufacturing industries.Most improvements in abrasion resistance are accompanied by decreased toughness, primarily due to the eutectic carbide content
The higher fracture toughness was attributed to strengthening during fracture, since very fine secondary carbide particles were present mainly in an austenitic matrix
In addition to primary austenite dendrites and eutectic composed of M7C3 carbides and austenite, V6C5 carbides were present in the structure of Fe-Cr-C-V alloys [40]
Summary
High chromium white cast irons are an important class of wear resistance materials currently used in a variety of applications where stability in an aggressive environment is a principal requirement, including the mining and mineral processing, cement production, slurry pumping and pulp and paper manufacturing industries. Most improvements in abrasion resistance are accompanied by decreased toughness, primarily due to the eutectic carbide content. A range of properties can be obtained by matrix variations to obtain optimum combinations of wear. 1-13 resistance and resistance to premature failure; such changes can be achieved by alloying and/or heat treatment [1,2,3,4,5] Vol 20 (1) 2014 p. 1-13 resistance and resistance to premature failure; such changes can be achieved by alloying and/or heat treatment [1,2,3,4,5]
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