Título

CHARACTERIZATION OF HIGH CHROMIUM WHITE CAST IRON RESISTANCE TO ABRASIVE WEAR

CHARACTERIZATION OF HIGH CHROMIUM WHITE CAST IRON RESISTANCE TO ABRASIVE WEAR

Autoria

Dutra, Leandro Almeida; Mello, José Daniel Biasoli de; Scandian, Cherlio

DOI

10.5151/5463-5463-17675

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Resumo

This study aims to verify the abrasive wear resistance, against two-body and three- body tribosystems, of high chromium white cast irons used in grate bars for sinter plants.Three alloys of high chromium white cast irons were chosen from grate bars applications in a sinter plant. The materials were tested in three different tribometers: scratch test, pin-on-disk test and LTM test. The first two simulate severe abrasive wear conditions and the latter simulate a non-severe abrasive wear condition. The wear rate for each test was measured. The most resistant material to the abrasive wear simulated by the scratch test and the pin on disk test was the C0 alloy. The presence of M7C3 carbides precipitated in the eutectic phase offered higher protection to the austenitic matrix against the microploughing mechanism. On the other hand, for the LTM test, the most resistant material was the J4 alloy. The higher capacity of the ferritic matrix to absorb plastic deformation offered the material a higher resistance to the multiple indentation events.

 

This study aims to verify the abrasive wear resistance, against two-body and three- body tribosystems, of high chromium white cast irons used in grate bars for sinter plants.Three alloys of high chromium white cast irons were chosen from grate bars applications in a sinter plant. The materials were tested in three different tribometers: scratch test, pin-on-disk test and LTM test. The first two simulate severe abrasive wear conditions and the latter simulate a non-severe abrasive wear condition. The wear rate for each test was measured. The most resistant material to the abrasive wear simulated by the scratch test and the pin on disk test was the C0 alloy. The presence of M7C3 carbides precipitated in the eutectic phase offered higher protection to the austenitic matrix against the microploughing mechanism. On the other hand, for the LTM test, the most resistant material was the J4 alloy. The higher capacity of the ferritic matrix to absorb plastic deformation offered the material a higher resistance to the multiple indentation events.

Palavras-chave

White cast iron; Wear rate; Grate bars; Sinter plant.

White cast iron; Wear rate; Grate bars; Sinter plant.