Abstract
Niobium addition to 15%Cr white cast iron can increase its wear resistance because 1. (1) Nb forms extremely hard carbides (NbC) of hardness around HV 2400, (2) Nb can raise the matrix hardness of 15%Cr iron from HV 693 to HV 899, 2. (3) Nb shifts the eutectic point to the right, therefore the iron can have a high carbon content without the danger of forming brittle hyper-eutectic carbides, and 3. (4) the morphology of NbC is blockhook-like. The NbC particles can be kept firmly in the matrix during the wear process. The wear resistance was tested by wet rubber wheel abrasion tests. The optimum chemical composition of the iron found in these tests was used for making slurry pump components, which were field tested in a mineral mine. The field test confirmed the laboratory test results.
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